In some chemotherapy induced neuropathy models, mechanical hyperalgesia appears to involve alterations in the interactions between TRPV4, alpha2beta1 integrin, and src kinase [XREF_BIBR].

In some chemotherapy induced neuropathy models, mechanical hyperalgesia appears to involve alterations in the interactions between TRPV4, alpha2beta1 integrin, and src kinase [XREF_BIBR].

In some chemotherapy induced neuropathy models, mechanical hyperalgesia appears to involve alterations in the interactions between TRPV4, alpha2beta1 integrin, and src kinase [XREF_BIBR].

Unlike full-length TRPM8, eTRPM8 protein is confined to the endoplasmic reticulum, where it functions as a calcium release channel that facilitates elevations in calcium within adjacent mitochondria in response to canonical TRPM8 stimuli such as icilin, menthol, or cold.

Unlike full-length TRPM8, eTRPM8 protein is confined to the endoplasmic reticulum, where it functions as a calcium release channel that facilitates elevations in calcium within adjacent mitochondria in response to canonical TRPM8 stimuli such as icilin, menthol, or cold.

While it is possible that TRPM1 activity, per se, contributes to melanoma progression and invasiveness, a more likely mechanism arises from the fact that miRNA 211, a tumor suppressor miRNA, is encoded in one of the introns of the TRPM1 gene and its transcription is co-regulated with that of TRPM1 [XREF_BIBR].

Given that TRPA1 and TRPV1 produce similar effects of cellular depolarization and calcium influx, it is interesting to compare these effects of TRPA1 activation with those described above for TRPV1, where channel activation appears to delay barrier recovery.

For example, thymic stromal lymphopoietin (TSLP), which is released by keratinocytes in response to histaminergic signaling, activates neuronal TRPA1 downstream of the TSLP receptor [XREF_BIBR].

For example, thymic stromal lymphopoietin (TSLP), which is released by keratinocytes in response to histaminergic signaling, activates neuronal TRPA1 downstream of the TSLP receptor [XREF_BIBR].

There is also a growing body of evidence suggesting that TRPV3 is a key contributor to epidermal homeostasis and skin sensory function in certain pathological conditions.

This effect is partially keratinocyte-autonomous, since it was observed in keratinocyte conditional TRPV4 knockout animals, and since TRPV4 mediates calcium entry into cultured mouse keratinocytes upon UVB exposure [XREF_BIBR].

Two different stimuli that are known to promote keratinocyte differentiation, elevations in extracellular calcium and 1, 25, dihydroxyvitamin D3, both upregulate transcription of TRPV6 [XREF_BIBR].

TRPV1 Epidermal Upregulation in Human Skin Diseases.

Given that TRPA1 and TRPV1 produce similar effects of cellular depolarization and calcium influx, it is interesting to compare these effects of TRPA1 activation with those described above for TRPV1, where channel activation appears to delay barrier recovery.

Moreover, pharmacological or genetic blockade of SP signaling was shown to attenuate the inflammatory response associated with contact dermatitis [XREF_BIBR].

Indeed, they found that activation of TRPV3 in keratinocytes triggers the protease mediated shedding of the EGFR ligand, TGF-alpha.

At least part of the acute pain component in the former model is attributable to activation of TRPA1 by streptozotocin generated peroxynitrite [XREF_BIBR].

These electrophiles activate TRPA1 by covalent modification of specific cysteine residues located in the channel’s cytoplasmic N-terminus.

In one study, oxazolone induced ear edema was increased in mice lacking TRPV1 or in wild-type mice in which TRPV1 expressing neurons were desensitized with vanilloid compounds [XREF_BIBR].

When overexpressed recombinantly in cell lines, TRPV1 can be activated by capsaicin, the major pungent ingredient in chili peppers, or by related chemical compounds that share a vanilloid chemical group, thus providing the " transient receptor vanilloid " subfamily its name [XREF_BIBR].

Many non electrophillic chemicals, including certain anesthetics (e.g., propophol, isofluorane, lidocaine), fenamate nonsteroidal anti-inflammatory drugs, cannabinoids (e.g., increment (9)-Tetrahydrocannabinol), cooling agents (e.g., icillin), and intracellular calcium ions can also activate TRPA1, presumably via more conventional ligand-receptor interactions.

First, mitochondrial calcium influx enhances synthesis of adenosine triphosphate, which when released from keratinocytes might alter their proliferation and differentiation in an autocrine manner.

At least part of the acute pain component in the former model is attributable to activation of TRPA1 by streptozotocin-generated peroxynitrite [ xref ].

TRPV1 can alternatively be activated by extracellular protons, by certain small lipophilic molecules, including endogenous cannabinoid lipids such as anandamide and N-arachidonoyl dopamine [ xref ], or by a number of other chemical agonists such as 2-aminoethoxydiphenyl borate (2-APB), which had previously been recognized as a dose dependent activator and inhibitor of IP3 receptors and store-operated calcium channels [ xref ].

However, in addition to its conventional transcription mediated mechanisms of action, testosterone appears to activate TRPM8 by directly binding to the extracellular domain of the channel.

Nonetheless, transcripts of genes associated with IL-17 production, such as IL17F, RORC, IL23R, and CCR6, were significantly decreased in CD8 + CD103 + CD49a + relative to CD8 + CD103 + CD49a - Trm cells, whereas transcripts for IFN-gamma were elevated (XREF_FIG D-E).

Nonetheless, transcripts of genes associated with IL-17 production, such as IL17F, RORC, IL23R, and CCR6, were significantly decreased in CD8 + CD103 + CD49a + relative to CD8 + CD103 + CD49a - Trm cells, whereas transcripts for IFN-gamma were elevated (XREF_FIG D-E).

CD103 binds E-cadherin, which is highly expressed on epithelia, whereas CD69 antagonizes sphingosine 1-phosphate receptor 1 (S1PR1)-mediated egress from tissues.

Nonetheless, transcripts of genes associated with IL-17 production, such as IL17F, RORC, IL23R, and CCR6, were significantly decreased in CD8 + CD103 + CD49a + relative to CD8 + CD103 + CD49a - Trm cells, whereas transcripts for IFN-gamma were elevated (XREF_FIG D-E).

Nonetheless, transcripts of genes associated with IL-17 production, such as IL17F, RORC, IL23R, and CCR6, were significantly decreased in CD8 + CD103 + CD49a + relative to CD8 + CD103 + CD49a - Trm cells, whereas transcripts for IFN-gamma were elevated (XREF_FIG D-E).

Nonetheless, transcripts of genes associated with IL-17 production, such as IL17F, RORC, IL23R, and CCR6, were significantly decreased in CD8 + CD103 + CD49a + relative to CD8 + CD103 + CD49a - Trm cells, whereas transcripts for IFN-gamma were elevated (XREF_FIG D-E).

Nonetheless, transcripts of genes associated with IL-17 production, such as IL17F, RORC, IL23R, and CCR6, were significantly decreased in CD8 + CD103 + CD49a + relative to CD8 + CD103 + CD49a - Trm cells, whereas transcripts for IFN-gamma were elevated (XREF_FIG D-E).

Further validating transcriptional data, CXCR3 expression was higher on CD8 + CD103 + CD49a + Trm cells, whereas IL-23R and CCR6 were preferentially expressed by CD8 + CD103 + CD49a - Trm cells (XREF_FIG G).

Further validating transcriptional data, CXCR3 expression was higher on CD8 + CD103 + CD49a + Trm cells, whereas IL-23R and CCR6 were preferentially expressed by CD8 + CD103 + CD49a - Trm cells (XREF_FIG G).

In addition, CD8 + CD49a + Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response.

In addition, CD8 + CD49a + Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response.

In addition, CD8 + CD49a + Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response.

Accordingly, IL-15-dependent expression of perforin and granzyme B was augmented by IL-6, but not other cytokine combinations tested (XREF_SUPPLEMENTARY C-S2E).

Rather, their cytotoxic capacity was primed through IL-2 and IL-15-mediated induction of perforin and granzyme B expression.

Rather, their cytotoxic capacity was primed through IL-2 and IL-15-mediated induction of perforin and granzyme B expression.

In addition, CD8 + CD49a + Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response.

In addition, CD8 + CD49a + Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response.

Moreover, IL-15 stimulation potentiated TCR dependent expression of IL-17 and IFN-gamma by epidermal CD8 + CD103 + CD49a - and IFN-gamma by CD8 + CD103 + CD49a + Trm cells, respectively (XREF_FIG D), substantiating effectual gamma chain receptor signaling in both subsets.

In addition, CD8 + CD49a + Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response.

Further validating transcriptional data, CXCR3 expression was higher on CD8 + CD103 + CD49a + Trm cells, whereas IL-23R and CCR6 were preferentially expressed by CD8 + CD103 + CD49a - Trm cells (XREF_FIG G).

Further validating transcriptional data, CXCR3 expression was higher on CD8 + CD103 + CD49a + Trm cells, whereas IL-23R and CCR6 were preferentially expressed by CD8 + CD103 + CD49a - Trm cells (XREF_FIG G).

Moreover, IL-15 stimulation potentiated TCR dependent expression of IL-17 and IFN-gamma by epidermal CD8 + CD103 + CD49a - and IFN-gamma by CD8 + CD103 + CD49a + Trm cells, respectively (XREF_FIG D), substantiating effectual gamma chain receptor signaling in both subsets.

In addition, CD8 + CD49a + Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response.

In addition, CD8 + CD49a + Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response.

In addition, CD8 + CD49a + Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response.

CD103 binds E-cadherin, which is highly expressed on epithelia, whereas CD69 antagonizes sphingosine 1-phosphate receptor 1 (S1PR1)-mediated egress from tissues.

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

Relative to the epidermal CD8 + CD103 + CD49a - Trm cells, dermal counterparts produced 3.5-fold less IL-17.

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

Relative to the epidermal CD8 + CD103 + CD49a - Trm cells, dermal counterparts produced 3.5-fold less IL-17.

Thus, CD49a expression delineated a dichotomy in Trm cell cytokine production, augmented by IL-15, with CD8 + CD103 + CD49a - and CD8 + CD103 + CD49a + Trm cells preferentially producing IL-17 and IFN-gamma, respectively.

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

In human skin epithelia, CD8 + CD49a + Trm cells produced interferon-gamma, whereas CD8 + CD49a - Trm cells produced interleukin-17 (IL-17).

Thus, CD49a expression delineated a dichotomy in Trm cell cytokine production, augmented by IL-15, with CD8 + CD103 + CD49a - and CD8 + CD103 + CD49a + Trm cells preferentially producing IL-17 and IFN-gamma, respectively.

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

IL-2 and IL-15 Induce Cytotoxic Effector Protein Expression in Epidermal CD8 + CD103 + CD49a + Trm Cells.

Conversely, CD8 + CD49a - Trm cells from psoriasis lesions predominantly generated IL-17 responses that promote local inflammation in this skin disease.

This functional dichotomy was evident in the comparison of distinct immune mediated skin diseases, with skin biopsies from vitiligo patients showing a predominance of cytotoxic CD8 + CD103 + CD49a + Trm cells while skin biopsies from psoriasis patients featured the accumulation of the IL-17 producing CD8 + CD103 + CD49a - counterparts.

Thus, CD49a expression delineated a dichotomy in Trm cell cytokine production, augmented by IL-15, with CD8 + CD103 + CD49a - and CD8 + CD103 + CD49a + Trm cells preferentially producing IL-17 and IFN-gamma, respectively.

Thus, CD49a expression delineated a dichotomy in Trm cell cytokine production, augmented by IL-15, with CD8 + CD103 + CD49a - and CD8 + CD103 + CD49a + Trm cells preferentially producing IL-17 and IFN-gamma, respectively.

Generally, IFN-gamma contributes to immunity toward intracellular infections while IL-17 provides anti-fungal defense and both of these cytokines initiate inflammatory keratinocyte responses.

In line withincreased CD49a frequencies, IFN-gamma producing Trm cells were enriched in vitiligo lesions (XREF_FIG G).

Nonetheless, transcripts of genes associated with IL-17 production, such as IL17F, RORC, IL23R, and CCR6, were significantly decreased in CD8 + CD103 + CD49a + relative to CD8 + CD103 + CD49a - Trm cells, whereas transcripts for IFN-gamma were elevated (XREF_FIG D-E).

Nonetheless, transcripts of genes associated with IL-17 production, such as IL17F, RORC, IL23R, and CCR6, were significantly decreased in CD8 + CD103 + CD49a + relative to CD8 + CD103 + CD49a - Trm cells, whereas transcripts for IFN-gamma were elevated (XREF_FIG D-E).

Nonetheless, transcripts of genes associated with IL-17 production, such as IL17F, RORC, IL23R, and CCR6, were significantly decreased in CD8 + CD103 + CD49a + relative to CD8 + CD103 + CD49a - Trm cells, whereas transcripts for IFN-gamma were elevated (XREF_FIG D-E).

TCR engagement using anti-CD3 antibodies also preferentially induced IFN-gamma by epidermal CD8 + CD103 + CD49a + Trm cells (XREF_FIG D).

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

Collagen IV mediated engagement of CD49a enhanced IFN-gamma production by CD8 + CD103 + CD49a + Trm cells, possibly through stabilizing IFNG transcripts.

TNF and IL-2 were abundantly produced by dermal and epidermal Trm cell subsets (XREF_FIG B and 6C).

TNF and IL-2 were abundantly produced by dermal and epidermal Trm cell subsets (XREF_FIG B and 6C).

TNF and IL-2 were abundantly produced by dermal and epidermal Trm cell subsets (XREF_FIG B and 6C).

Revealing functional specialization among epidermal Trm cells with respect to CD49a expression, CD8 + CD103 + CD49a - Trm cells preferentially produced IL-17, a cytokine required for control of bacterial and fungal infections.

Moreover, IL-17 or IFN-gamma production by distinct Trm cells subsets was generally maintained even in the context of the vigorous tissue inflammation.

In human skin epithelia, CD8 + CD49a + Trm cells produced interferon-gamma, whereas CD8 + CD49a - Trm cells produced interleukin-17 (IL-17).

Corroborating transcriptional profiles, CD8 + CD103 + CD49a - Trm cells produced IL-17 while CD8 + CD103 + CD49a + Trm cells excelled in IFN-gamma production upon stimulation with phorbol 12-myristate 13-acetate and ionomycin (XREF_FIG A-6C).

Thus, CD49a expression delineated a dichotomy in Trm cell cytokine production, augmented by IL-15, with CD8 + CD103 + CD49a - and CD8 + CD103 + CD49a + Trm cells preferentially producing IL-17 and IFN-gamma, respectively.

Here, we identify CD49a expression as a marker delineating a subpopulation ofCD8 + Trm cells in human skin that specifically localize to thebasal layer of epidermis, preferentially produce IFN-gamma, and display high cytotoxic capacity upon stimulation.

Moreover, IL-17 or IFN-gamma production by distinct Trm cells subsets was generally maintained even in the context of the vigorous tissue inflammation.

In human skin epithelia, CD8 + CD49a + Trm cells produced interferon-gamma, whereas CD8 + CD49a - Trm cells produced interleukin-17 (IL-17).

Thus, CD49a expression delineated a dichotomy in Trm cell cytokine production, augmented by IL-15, with CD8 + CD103 + CD49a - and CD8 + CD103 + CD49a + Trm cells preferentially producing IL-17 and IFN-gamma, respectively.

TNF and IL-2 were abundantly produced by dermal and epidermal Trm cell subsets (XREF_FIG B and 6C).

The kinase activity of TAK1 leads to phosphorylation events that activate AP-1 and NF-κB. In parallel to cIAP-induced ubiquitination of RIPK2, XIAP’s enzymatic activity results in the formation of polyubiquitin chains on RIPK2, serving as a platform to engage another E3 ligase complex known as the Linear Ubiquitin Assembly Complex (LUBAC) ( xref , xref ).

K63-linked ubiquitination of RIPK2 has been established as a means to construct protein scaffolds that transduce downstream signaling.

In a step-wise fashion, ubiquitination of RIPK2 leads to activation and recruitment of the TAK1 complex, consisting of TAK1 in association with TAK1-binding protein (TAB)2 and 3.

It was recently shown that MAVS recruits NLRP3 to the mitochondria for activation in response to non crystalline activators and that microtubule driven trafficking of the mitochondria is necessary for NLRP3 and ASC complex assembly and activation.

It was recently shown that MAVS recruits NLRP3 to the mitochondria for activation in response to non crystalline activators and that microtubule driven trafficking of the mitochondria is necessary for NLRP3 and ASC complex assembly and activation.

By triggering the phosphorylation of the autophagy inducer ULK1, RIPK2 induces autophagy of disrupted mitochondria (mitophagy), preventing the accumulation of ROS and NLRP3 inflammasome activation.

Conversely, others have shown that overexpression of NLRP7 inhibited pro-IL-1beta synthesis and secretion.

Some studies have suggested that NLRP12 may negatively regulate the NF-kappaB pathway.

IFNgamma functions via signal transducer and activator of transcription 1 (STAT1) and can not induce NLRC5 expression in the absence of STAT1.

Despite this focus, much of the nature of the NOD1 and 2 interaction with these structures remains unknown, although recent findings suggest that NOD2 directly binds MDP with high affinity ( xref ), with the N-glycosylated form specific to the mycobacterial cell wall triggering an exceptionally strong immunogenic response compared to N-acetyl MDP ( xref ).

Moreover, it was recently reported that bacterial acylated lipopeptides (acLP) activated NLRP7 and stimulated formation of an NLRP7-ASC-caspase-1 inflammasome ( xref ).

It was recently shown that MAVS recruits NLRP3 to the mitochondria for activation in response to non crystalline activators and that microtubule driven trafficking of the mitochondria is necessary for NLRP3 and ASC complex assembly and activation.

While this mechanism is still poorly understood, the ability of NLRP10 to interact with NOD1 as well as its signaling targets RIPK2, TAK1, and NEMO, suggests that NLRP10 may be involved in optimizing cytokine release following bacterial infections.

NOD1 and 2 both interact with RIPK2, via a CARD-CARD homotypic interaction.

In Alzheimer 's disease, amyloid-beta aggregates were shown to activate NLRP3 ex vivo in primary macrophages and microglia.

The possibility of a role for NOD2 in non bacterial infections has also been suggested, with NOD2 having been shown to induce an IFNbeta driven antiviral response following recognition of single stranded viral RNA.

IL-1beta produced downstream of the NLRP3 inflammasome, which is also stimulated by islet amyloid polypeptide, promotes beta-cell dysfunction, and cell death, linking NLRP3 activation to insulin resistance.

Moreover, it was recently reported that bacterial acylated lipopeptides (acLP) activated NLRP7 and stimulated formation of an NLRP7-ASC-caspase-1 inflammasome.

NLRX1 has been shown to enhance ROS production when it is overexpressed, following Chlamydia and Shigella infection, as well as in response to TNFalpha and poly (I : C).

A recent study by Zhong et al. suggested that particulate stimuli might induce mitochondrial production of reactive oxygen species (ROS), which triggers a calcium influx mediated by transient receptor potential melastatin 2 (TRPM2) to activate NLRP3.

A recent study by Zhong et al. suggested that particulate stimuli might induce mitochondrial production of reactive oxygen species (ROS), which triggers a calcium influx mediated by transient receptor potential melastatin 2 (TRPM2) to activate NLRP3.

Mutations in NLRP3 were reported to induce an overproduction of IL-1beta that triggers the subsequent development of severe inflammation.

Ceballos-Olvera et al. demonstrated that while IL-18 and pyroptosis are both essential for host resistance, the production of IL-1beta by NLRP3 was deleterious, as it triggered excessive neutrophil recruitment and exacerbated the disease.

Other NLRs such as NOD1, NOD2, NLRP10, NLRX1, NLRC5, and CIITA do not directly engage the inflammatory caspases, but instead activate nuclear factor-kappaB (NF-kappaB), mitogen activated protein kinases (MAPKs), and interferon (IFN) regulatory factors (IRFs) to stimulate innate immunity.

A recent study by Zhong et al. suggested that particulate stimuli might induce mitochondrial production of reactive oxygen species (ROS), which triggers a calcium influx mediated by transient receptor potential melastatin 2 (TRPM2) to activate NLRP3.

By triggering the phosphorylation of the autophagy inducer ULK1, RIPK2 induces autophagy of disrupted mitochondria (mitophagy), preventing the accumulation of ROS and NLRP3 inflammasome activation.

Nlrp6 - / - mice had increased numbers of immune cells in their circulation, as well as enhanced activation of MAPK and NF-kappaB signaling, though Toll like receptor (TLR) activation, suggesting that NLRP6 may suppress TLR pathways after the recognition of pathogens to prevent amplified inflammatory pathology.

Other NLRs such as NOD1, NOD2, NLRP10, NLRX1, NLRC5, and CIITA do not directly engage the inflammatory caspases, but instead activate nuclear factor-kappaB (NF-kappaB), mitogen activated protein kinases (MAPKs), and interferon (IFN) regulatory factors (IRFs) to stimulate innate immunity.

Few ligands have been found for NLRP1 to date, and include bacterial products such as lethal toxin (LT) produced by Bacillus anthracis which activates murine NLRP1b ( xref ), muramyl dipeptide (MDP), a component of bacterial peptidoglycan that activates human NLRP1; and reduced levels of cytosolic ATP ( xref – xref ).

Moreover, it was recently reported that bacterial acylated lipopeptides (acLP) activated NLRP7 and stimulated formation of an NLRP7-ASC-caspase-1 inflammasome ( xref ).

The exact mechanism of NLRP3 activation by uric acid crystals is still unknown, but monosodium urate and calcium pyrophosphate dihydrate crystals were found to induce NLRP3 and caspase-1 activation and the subsequent processing of IL-1beta and IL-18.

The exact mechanism of NLRP3 activation by uric acid crystals is still unknown, but monosodium urate and calcium pyrophosphate dihydrate crystals were found to induce NLRP3 and caspase-1 activation and the subsequent processing of IL-1beta and IL-18.

The exact mechanism of NLRP3 activation by uric acid crystals is still unknown, but monosodium urate and calcium pyrophosphate dihydrate crystals were found to induce NLRP3 and caspase-1 activation and the subsequent processing of IL-1beta and IL-18.

The exact mechanism of NLRP3 activation by uric acid crystals is still unknown, but monosodium urate and calcium pyrophosphate dihydrate crystals were found to induce NLRP3 and caspase-1 activation and the subsequent processing of IL-1beta and IL-18.

A recent study by Zhong et al. suggested that particulate stimuli might induce mitochondrial production of reactive oxygen species (ROS), which triggers a calcium influx mediated by transient receptor potential melastatin 2 (TRPM2) to activate NLRP3.

The exact mechanism of NLRP3 activation by uric acid crystals is still unknown, but monosodium urate and calcium pyrophosphate dihydrate crystals were found to induce NLRP3 and caspase-1 activation and the subsequent processing of IL-1beta and IL-18.

The exact mechanism of NLRP3 activation by uric acid crystals is still unknown, but monosodium urate and calcium pyrophosphate dihydrate crystals were found to induce NLRP3 and caspase-1 activation and the subsequent processing of IL-1beta and IL-18.

The exact mechanism of NLRP3 activation by uric acid crystals is still unknown, but monosodium urate and calcium pyrophosphate dihydrate crystals were found to induce NLRP3 and caspase-1 activation and the subsequent processing of IL-1beta and IL-18.

The exact mechanism of NLRP3 activation by uric acid crystals is still unknown, but monosodium urate and calcium pyrophosphate dihydrate crystals were found to induce NLRP3 and caspase-1 activation and the subsequent processing of IL-1beta and IL-18.

Ceramide, a specific product from the metabolism of long-chain saturated fatty acids, and the saturated free fatty acid, palmitate, have been shown to induce IL-1beta in an NLRP3 dependent fashion [Ref.

Crystalline cholesterol was proposed to cause atherosclerosis by acting as a danger signal and initiating inflammation through the NLRP3 inflammasome.

A recent study by Zhong et al. suggested that particulate stimuli might induce mitochondrial production of reactive oxygen species (ROS), which triggers a calcium influx mediated by transient receptor potential melastatin 2 (TRPM2) to activate NLRP3.

PTEN and PTPs all antagonize the insulin signaling as they directly interact with PI3K and IR [XREF_BIBR], and both consist of a cysteine residue in the active site that is highly susceptible to H 2 O 2 -induced oxidation.

The C2 domain ( amino acids 186-351 ) can bind phospholipid membrane independent of calcium because it lacks the canonical Ca2 + chelating residues in vitro , which makes PTEN inhibit cell migration [ 31 ] .

For instance, H 2 O 2 can induce PTEN oxidation, which inactivates PTEN phosphatase function by establishing a Cys 124 -Cys 71 disulfide bond [XREF_BIBR].

For example, the Parkinson disease protein 7 (PARK7) was found to repress the PTEN phosphatase function by binding to PTEN.

Recently, it has been found that the impairment of PARK2 can induce the suppression of PTEN by S nitrosylation through increase the level of NO [XREF_BIBR].

Recently , it has been found that the impairment of PARK2 can induce the suppression of PTEN by S-nitrosylation through increase the level of NO [ 55 ] .

Besides, Prx II deficient MEFs induced PTEN oxidation and increased PI3K and Akt activation when exposed to insulin, which leads to an increase the insulin sensitivity.

Prx III-deficiency also induces the augmentation in both PTEN oxidation and Trx dimerization.

In addition, p300-CREB-binding protein (CBP) has been shown to acetylate PTEN at Lys 402 in the PDZ-binding motif.

It has been demonstrated that Prx I can preserve and promote the tumor-suppressive function of PTEN by preventing oxidation of PTEN under benign oxidative stress via direct interaction.

Also, Prx II deficient cells increased PTEN oxidation and insulin sensitivity.

To examine whether FoxO3a is required for PTEN mediated negative regulation of autophagy, we analyzed the mRNA levels of ATG5, ATG7, and ATG12 in the ipsilateral hippocampus post-ICH.

In the present study, PTEN inhibition not only reduced the levels of autophagy related proteins but also activated the PI3K and AKT pathway in the ipsilateral hippocampus after ICH.

Functionally, our findings confirmed that inhibition of PTEN by PTEN siRNA or specific inhibitor not only ameliorated secondary hippocampal injury but also promoted hippocampal-dependent cognition and memory recovery, suggesting important neuroprotective effects against hemorrhagic insults.

Specifically, PTEN antagonized the PI3K and AKT signaling and downstream effector FoxO3a phosphorylation and subsequently enhanced nuclear translocation of FoxO3a to drive proautophagy gene program, but these changes were diminished upon PTEN inhibition.

Mechanistically, blockage of PTEN could enhance FoxO3a phosphorylation modification to restrict its nuclear translocation and ATG transcription via activating the PI3K and AKT pathway, leading to the suppression of the autophagic program.

Inhibition of PTEN Ameliorates Secondary Hippocampal Injury and Cognitive Deficits after Intracerebral Hemorrhage : Involvement of AKT / FoxO3a / ATG-Mediated Autophagy .

Inhibition of PTEN Ameliorates Secondary Hippocampal Injury and Cognitive Deficits after Intracerebral Hemorrhage : Involvement of AKT / FoxO3a / ATG-Mediated Autophagy Spontaneous intracerebral hemorrhage ( ICH ) commonly causes secondary hippocampal damage and delayed cognitive impairments , but the mechanisms remain elusive .

According to these data, we speculate that posthemorrhagic PTEN elevation triggers the nuclear accumulation of FoxO3a and subsequent transcriptional activation of ATGs, resulting in sequential activation of autophagy.

Herein, we identified that ICH induced a significant increase in ATG transcriptional levels including ATG5, ATG7, and ATG12, which was strongly associated with PTEN mediated FoxO3a nuclear translocation.

PTEN Inhibition Reverses Secondary Hippocampal Injury Post-ICH.

Also, inactivation of the PI3K/AKT/mTOR pathway has been implicated in PTEN induced autophagy initiation [XREF_BIBR, XREF_BIBR].

However , blockage of PTEN prominently abolished these ATG transcriptions and subsequent autophagy induction .

Also, the phosphorylation of c-Jun N-terminal kinase (JNK) and extracellular-signal-regulated kinase (ERK) were stimulated by S100A8, which had an analogous effect to the lipopolysaccharide (LPS) treatment ( xref C–E).

S100A8 Induced Pro Inflammatory Cytokine Production Via Phosphorylation of ERK and JNK in BV-2 Cells.

Also, the phosphorylation of c-Jun N-terminal kinase (JNK) and extracellular-signal-regulated kinase (ERK) were stimulated by S100A8, which had an analogous effect to the lipopolysaccharide (LPS) treatment (XREF_FIG C-E).

Also, the phosphorylation of c-Jun N-terminal kinase (JNK) and extracellular-signal-regulated kinase (ERK) were stimulated by S100A8, which had an analogous effect to the lipopolysaccharide (LPS) treatment ( xref C–E).

S100A8 Induced Pro Inflammatory Cytokine Production Via Phosphorylation of ERK and JNK in BV-2 Cells.

Also, the phosphorylation of c-Jun N-terminal kinase (JNK) and extracellular-signal-regulated kinase (ERK) were stimulated by S100A8, which had an analogous effect to the lipopolysaccharide (LPS) treatment (XREF_FIG C-E).

The S100A8 knockdown using shRNA revealed that COX-2 and PGE 2 expression was regulated by S100A8, which suggested that the intracellular increase of microglial S100A8 levels upregulated COX-2 expression and PGE2 secretion, contributing to neuronal death under hypoxic conditions.

Our study showed that hypoxia increased the production of S100A8 in microglia .

FACS analysis showed that the increase of S100A8 levels in microglia by hypoxia promoted neuronal apoptosis , which was confirmed by immunofluorescence .

In agreement with previous reports, the results of this study confirmed that S100A8 significantly increased the production of IL-6, TNF-alpha, and IL-1beta.

In our study , the increase of IL-1beta expression by S100A8 indicated that S100A8 was involved in the priming signal for NLRP3 inflammasome assembly in microglia ( Figure 2B ) .

In agreement with previous reports, the results of this study confirmed that S100A8 significantly increased the production of IL-6, TNF-alpha, and IL-1beta.

These results suggested that S100A8, secreted by neuronal cells under hypoxic conditions, combined with TLR4 of microglia cells, activated the NLRP3 inflammasome priming.

These results strongly suggested that S100A8 induced the NLRP3 inflammasome priming via NF-kappaB activation.

The results suggested that S100A8, secreted by neuronal cells under hypoxic conditions, triggered the priming of NLRP3 in microglial cells, through the TLR4 and NF-kappaB signaling.

In addition, the translocation of NF-kB, which played a pivotal role in regulating the expression and activation of NLRP3, was also increased when cells were treated with S100A8.

In agreement with previous reports, the results of this study confirmed that S100A8 significantly increased the production of IL-6, TNF-alpha, and IL-1beta.

FACS analysis showed that the increase of S100A8 levels in microglia by hypoxia promoted neuronal apoptosis, which was confirmed by immunofluorescence.

However, for the first time, we showed that up-regulation of microglial S100A8 levels increased neuronal apoptosis after hypoxia, in primary multicellular cultures consisting of neurons, astrocytes, and microglia.

Therefore, this study determined whether S100A8 induced neuronal apoptosis during cerebral hypoxia and elucidated its mechanism of action using in vitro systems, including astrocytes and microglial and neuronal cells, under hypoxic conditions.

S100A8 Knockdown on Microglia Attenuated Neuronal Apoptosis by Hypoxia.

To investigate whether S100A8 expression in microglia induced apoptosis of neuronal cells under hypoxic condition, SH-SY5Y cells were co-cultured with BV-2 cells transfected with S100A8 shRNA for 48 h in a 0.4 mum pore transwell system and under hypoxic conditions (XREF_FIG A, B).

These findings indicated that the expression of S100A8, induced in microglia cells under hypoxic conditions, activated COX-2 expression and PGE 2 secretion to induce the apoptosis of neurons.

Knockdown of S100A8 levels by using shRNA revealed that microglial S100A8 expression activated COX-2 expression, leading to neuronal apoptosis under hypoxia.

S100A8, secreted from neurons under hypoxia, activated the secretion of tumor necrosis factor (TNF-alpha) and interleukin-6 (IL-6) through phosphorylation of extracellular-signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) in microglia.

S100A8, secreted from neurons under hypoxia, activated the secretion of tumor necrosis factor (TNF-alpha) and interleukin-6 (IL-6) through phosphorylation of extracellular-signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) in microglia.

The aim of this study was to determine whether S100A8 induced neuronal apoptosis during cerebral hypoxia and elucidate its mechanism of action.

The precise mechanism of how LASP1 promotes PTEN ubiquitination still remains elusive xref .

The precise mechanism of how LASP1 promotes PTEN ubiquitination still remains elusive 53.

In another study, the heat shock-like protein Clusterin was shown to increase AKT2 activity and promote the motility of both normal and malignant prostate cells via an inhibitory activity on PTEN-S380 phosphorylation and consequent inactivation of PTEN xref .

Another study demonstrated that phosphorylation of PTEN on tyrosine 240 by FGFR2 promotes chromatin binding through an interaction with Ki-67, which facilitates the recruitment of RAD51 to promote DNA repair xref . xref summarises these novel functions and signalling axes of nuclear PTEN.

One study showed that Nuclear Receptor Binding SET Domain Protein 2 (NSD2)-mediated dimethylation of PTEN promotes 53BP1 interactions and subsequent recruitment to sites of DNA-damage sites 75.

Newer studies add to this small body of data , including an intriguing study where a novel PTEN / ARID4B / PI3K pathway in which PTEN inhibits the expression of ARID4B was characterised .

PTEN inhibits ARID4B expression and thus prevents the transcriptional activation of ARID4B transcriptional targets PIK3CA and PIK3R2 ( PI3K subunits ) 79 .

By using specific mutants of PTEN lacking lipid phosphatase function, an early study concluded that PTEN may block cell migration through a protein phosphatase mediated function on focal adhesion kinase (FAK) protein 14.

PTEN and PDHK1 were observed to have a synthetic-lethal relationship, as loss of PTEN and upregulation of PDHK1 in cells induced glycolysis and a dependency on PDHK1 100.

This PTEN/ARID4B/PI3K signalling axis identifies a novel player in the PTEN mediated suppression of the PI3K pathway and provides a new opportunity to design novel therapeutics to target this axis to promote the tumour suppressive functions of PTEN.

In one of these studies, Baker et al. reported that Notch1 can mediate transcriptional suppression of PTEN, resulting in the derepression of PI3K signalling and development of trastuzumab resistance 91.

This study was the first to link the Ras-MAPK and PI3K pathways through Notch1 transcriptional suppression of PTEN 91.

It was reported that PTEN could dephosphorylate PGK1, a glycolytic enzyme and protein kinase with a tumorigenic role in glioblastoma xref .

Dephosphorylation of PGK1 by PTEN was found to inhibit its activity, downstream glycolytic functions, and glioblastoma cell proliferation xref , thereby presenting another mechanism in which PTEN functions as a tumour suppressor.

It was reported that PTEN could dephosphorylate PGK1, a glycolytic enzyme and protein kinase with a tumorigenic role in glioblastoma 99.

Dephosphorylation of PGK1 by PTEN was found to inhibit its activity, downstream glycolytic functions, and glioblastoma cell proliferation 99, thereby presenting another mechanism in which PTEN functions as a tumour suppressor.

Newer studies add to this small body of data, including an intriguing study where a novel PTEN/ARID4B/PI3K pathway in which PTEN inhibits the expression of ARID4B was characterised.

PTEN inhibits ARID4B expression and thus prevents the transcriptional activation of ARID4B transcriptional targets PIK3CA and PIK3R2 (PI3K subunits) 79.