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Murugan, Subathra and Jakka, Padmaja and Namani, Swapna and Mujumdar, Varadendra and Radhakrishnan, Girish (2019) The neurosteroid pregnenolone promotes degradation of key proteins in the innate immune signaling to suppress inflammation. Journal of Biological Chemistry, 294 (12). pp. 4596-4607. ISSN 0021-9258

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Pregnenolone is a steroid hormone precursor that is synthesized in various steroidogenic tissues, in the brain, and in lymphocytes. In addition to serving as the precursor for other steroid hormones, pregnenolone exerts its own effect as an anti-inflammatory molecule to maintain immune homeostasis in various inflammatory conditions. Pregnenolone and its metabolic derivatives have been shown to have beneficial effects in the brain, including enhancing memory and learning, reversing depressive disorders, and modulating cognitive functions. A decreased level of pregnenolone has been observed in neuroinflammatory diseases, which emphasizes its role in neuroprotection and neuroregeneration. Although the anti-inflammatory property of pregnenolone was recognized several decades ago, its mechanism of action remains unknown. Here we report that pregnenolone promotes ubiquitination and degradation of the TLR2/4 adaptor protein TIRAP and TLR2 in macrophages and microglial cells. Pregnenolone and its metabolites suppressed the secretion of tumor necrosis factor α and interleukin-6 mediated through TLR2 and TLR4 signaling. Pregnenolone has been reported to induce activation of cytoplasmic linker protein 170, and this protein has recently been shown to promote targeted degradation of TIRAP. We observed enhanced degradation of TIRAP and TLR4 suppression by cytoplasmic linker protein 170 in the presence of pregnenolone. Our experimental data reveal novel nongenomic targets of pregnenolone and provide important leads to understand its role in restoring immune homeostasis in various inflammatory conditions.

Item Type: Article
Subjects: Animal Genetics and Genomics
Infectious Diseases
Inflammation Biology
Reproductive Biology
Genetic Engineering
Depositing User: Mr Harjit Singh
Date Deposited: 26 Jun 2019 09:05
Last Modified: 26 Jun 2019 11:09
URI: http://niab.sciencecentral.in/id/eprint/70

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