Dataset Information

Deficiency of PTP1B Attenuates Hypothalamic Inflammation via Activation of the JAK2-STAT3 Pathway in Microglia.

ABSTRACT: Protein tyrosine phosphatase 1B (PTP1B) regulates leptin signaling in hypothalamic neurons via the JAK2-STAT3 pathway. PTP1B has also been implicated in the regulation of inflammation in the periphery. However, the role of PTP1B in hypothalamic inflammation, which is induced by a high-fat diet (HFD), remains to be elucidated. Here, we showed that STAT3 phosphorylation (p-STAT3) was increased in microglia in the hypothalamic arcuate nucleus of PTP1B knock-out mice (KO) on a HFD, accompanied by decreased Tnf and increased Il10 mRNA expression in the hypothalamus compared to wild-type mice (WT). In hypothalamic organotypic cultures, incubation with TNFα led to increased p-STAT3, accompanied by decreased Tnf and increased Il10 mRNA expression, in KO compared to WT. Incubation with p-STAT3 inhibitors or microglial depletion eliminated the differences in inflammation between genotypes. These data indicate an important role of JAK2-STAT3 signaling negatively regulated by PTP1B in microglia, which attenuates hypothalamic inflammation under HFD conditions.

SUBMITTER: Tsunekawa T

PROVIDER: S-EPMC5474442 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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Deficiency of PTP1B Attenuates Hypothalamic Inflammation via Activation of the JAK2-STAT3 Pathway in Microglia.

Tsunekawa Taku T Banno Ryoichi R Mizoguchi Akira A Sugiyama Mariko M Tominaga Takashi T Onoue Takeshi T Hagiwara Daisuke D Ito Yoshihiro Y Iwama Shintaro S Goto Motomitsu M Suga Hidetaka H Sugimura Yoshihisa Y Arima Hiroshi H

EBioMedicine 20170109

Protein tyrosine phosphatase 1B (PTP1B) regulates leptin signaling in hypothalamic neurons via the JAK2-STAT3 pathway. PTP1B has also been implicated in the regulation of inflammation in the periphery. However, the role of PTP1B in hypothalamic inflammation, which is induced by a high-fat diet (HFD), remains to be elucidated. Here, we showed that STAT3 phosphorylation (p-STAT3) was increased in microglia in the hypothalamic arcuate nucleus of PTP1B knock-out mice (KO) on a HFD, accompanied by de ...[more]

PMID: 28094236

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Project description:As the current clinical treatment of acetaminophen (APAP)‑induced liver injury (AILI) has its limitations, new and effective treatment methods are required. Fingolimod (FTY720) is an immunosuppressive drug developed in recent years that has been shown to have a protective effect against ischemia/reperfusion liver injury. However, the role of FTY720 in AILI remains unclear. The aim of the present study was to determine whether FTY720 has a protective effect on AILI. AILI was induced using intraperitoneal injection of 300 mg/kg APAP in male C57BL/6J mice. Following APAP challenge, the mice were administered 5 mg/kg FTY720 for 30 min. Protein expression levels were measured using western blot analysis. Cell viability was examined using Cell Counting Kit‑8 assays. mRNA levels were measured using reverse transcription‑quantitative PCR. Inflammation levels were evaluated using immunohistochemistry. Cell death and reactive oxygen species levels were examined using immunofluorescence. Furthermore, laser scanning intravital microscopy was used to directly observe immune cell recruitment. APAP treatment increased the serum levels of alanine transaminase and aspartate transaminase at the 6‑ and 12‑h time‑points, suggesting liver tissue damage. However, FTY720 attenuated the liver injury induced by APAP by reducing the recruitment of immune cells and the release of pro‑inflammatory cytokines and chemokines. FTY720 activated JAK2/STAT3 signaling and regulated the expression of BAX, BCL‑2 and p65 to inhibit apoptosis and inflammation. In addition, compared with APAP treatment, the viability of primary hepatocytes treated with APAP and FTY720 was increased. Inhibition of JAK2/STAT3 signaling attenuated the protective, antioxidant effects of FTY720. In conclusion, FTY720 reduced liver injury by regulating the JAK2/STAT3 signaling pathway. This compound was capable of inhibiting oxidative stress to reduce hepatocyte death and the infiltration of neutrophils in the liver.

Dataset Information

Deficiency of PTP1B Attenuates Hypothalamic Inflammation via Activation of the JAK2-STAT3 Pathway in Microglia.

Publications

Deficiency of PTP1B Attenuates Hypothalamic Inflammation via Activation of the JAK2-STAT3 Pathway in Microglia.

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