{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T00:59:01Z","timestamp":1784077141588,"version":"3.55.0"},"reference-count":66,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2021,5,28]],"date-time":"2021-05-28T00:00:00Z","timestamp":1622160000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000053","name":"National Eye Institute","doi-asserted-by":"publisher","award":["EY020895"],"award-info":[{"award-number":["EY020895"]}],"id":[{"id":"10.13039\/100000053","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>Purpose: We have previously demonstrated that HspB4\/\u03b1A-crystallin, a molecular chaperone, plays an important intrinsic neuroprotective role during diabetes, by its phosphorylation on residue 148. We also reported that HspB4\/\u03b1A-crystallin is highly expressed by glial cells. There is a growing interest in the potential causative role of low-grade inflammation in diabetic retinopathy pathophysiology and retinal M\u00fcller glial cells\u2019 (MGCs\u2019) participation in the inflammatory response. MGCs indeed play a central role in retinal homeostasis via secreting various cytokines and other mediators. Hence, this study was carried out to delineate and understand the regulatory function of HspB4\/\u03b1A-crystallin in the inflammatory response associated with metabolic stresses. Methods: Primary MGCs were isolated from knockout HspB4\/\u03b1A-crystallin mice. These primary cells were then transfected with plasmids encoding either wild-type (WT), phosphomimetic (T148D), or non-phosphorylatable mutants (T148A) of HspB4\/\u03b1A-crystallin. The cells were exposed to multiple metabolic stresses including serum starvation (SS) or high glucose with TNF-alpha (HG + T) before being further evaluated for the expression of inflammatory markers by qPCR. The total protein expression along with subcellular localization of NF-kB and the NLRP3 component was assessed by Western blot. Results: Elevated levels of IL-6, IL-1\u03b2, MCP-1, and IL-18 in SS were significantly diminished in MGCs overexpressing WT and further in T148D as compared to EV. The HG + T-induced increase in these inflammatory markers was also dampened by WT and even more significantly by T148D overexpression, whereas T148A was ineffective in either stress. Further analysis revealed that overexpression of WT or the T148D, also led to a significant reduction of Nlrp3, Asc, and caspase-1 transcript expression in serum-deprived MGCs and nearly abolished the NF-kB induction in HG + T diabetes-like stress. This mechanistic effect was further evaluated at the protein level and confirmed the stress-dependent regulation of NLRP3 and NF-kB by \u03b1A-crystallin. Conclusions: The data gathered in this study demonstrate the central regulatory role of HspB4\/\u03b1A-crystallin and its modulation by phosphorylation on T148 in retinal MGCs. For the first time, this study demonstrates that HspB4\/\u03b1A-crystallin can dampen the stress-induced expression of pro-inflammatory cytokines through the modulation of multiple key inflammatory pathways, therefore, suggesting its potential as a therapeutic target for the modulation of chronic neuroinflammation.<\/jats:p>","DOI":"10.3390\/jcm10112384","type":"journal-article","created":{"date-parts":[[2021,5,28]],"date-time":"2021-05-28T11:33:20Z","timestamp":1622201600000},"page":"2384","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["HspB4\/\u03b1A-Crystallin Modulates Neuroinflammation in the Retina via the Stress-Specific Inflammatory Pathways"],"prefix":"10.3390","volume":"10","author":[{"given":"Madhu","family":"Nath","sequence":"first","affiliation":[{"name":"Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48105, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0639-4501","authenticated-orcid":false,"given":"Yang","family":"Shan","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48105, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Angela M.","family":"Myers","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48105, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3956-1908","authenticated-orcid":false,"given":"Patrice Elie","family":"Fort","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48105, USA"},{"name":"Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48105, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"518","DOI":"10.1089\/jop.2016.0131","article-title":"Role of Purines in Muller Glia","volume":"32","author":"Reichenbach","year":"2016","journal-title":"J. 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