Human resistin, a proinflammatory cytokine, shows chaperone-like activity
| العنوان: | Human resistin, a proinflammatory cytokine, shows chaperone-like activity |
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| المؤلفون: | Varma D. Aadinarayana, Madhuri Suragani, Aleem Basha Pinjari, Karunakar Tanneeru, Sharmistha Banerjee, Tapan K. Chaudhuri, Saurabh Pandey, Nasreen Z. Ehtesham, Lalitha Guruprasad |
| المصدر: | Proceedings of the National Academy of Sciences. 110:20467-20472 |
| بيانات النشر: | Proceedings of the National Academy of Sciences, 2013. |
| سنة النشر: | 2013 |
| مصطلحات موضوعية: | endocrine system diseases, Proinflammatory cytokine, Mice, chemistry.chemical_compound, Animals, Humans, Citrate synthase, Resistin, Secretion, Enzyme Inhibitors, Heat shock, Inflammation, Multidisciplinary, biology, Tunicamycin, Endoplasmic reticulum, nutritional and metabolic diseases, U937 Cells, Transfection, respiratory system, Biological Sciences, Anti-Bacterial Agents, Cell biology, chemistry, Biochemistry, Chaperone (protein), biology.protein, Cytokines, Thapsigargin, Inflammation Mediators, Microtubule-Associated Proteins, hormones, hormone substitutes, and hormone antagonists, Heat-Shock Response, HeLa Cells, Molecular Chaperones |
| الوصف: | Resistin, a cysteine-rich adipocytokine, proposed as a link between obesity and diabetes in mice, was shown as a proinflammatory molecule in humans. We earlier reported that human resistin (hRes), a trimer, was resistant to heat and urea denaturation, existed in an oligomeric polydispersed state, and showed a concentration-dependent conformational change. These properties and an intimate correlation of hRes expression with cellular stress prompted us to investigate hRes as a possible chaperone. Here, we show that recombinant human resistin was able to protect the heat-labile enzymes citrate synthase and Nde1 from thermal aggregation and inactivation and was able to refold and restore their enzymatic activities after heat/guanidinium chloride denaturation. Furthermore, recombinant human resistin could bind misfolded proteins only. Molecular dynamics-based association-dissociation kinetics of hRes subunits pointed to resistin being a molecular chaperone. Bis-ANS, which blocks surface hydrophobicity, abrogated the chaperone activity of hRes, establishing the importance of surface hydrophobicity for chaperone activity. Replacement of Phe49 with Tyr (F49YhRes), a critical residue within the hydrophobic patch of hRes, although it could prevent thermal aggregation of citrate synthase and Nde1, was unable to refold and restore their activities. Treatment of U937 cells with tunicamycin/thapsigargin resulted in reduced hRes secretion and concomitant localization in the endoplasmic reticulum. Escherichia coli transformants expressing hRes could be rescued from thermal stress, pointing to hRes's chaperone-like function in vivo. HeLa cells transfected with hRes showed protection from thapsigargin-induced apoptosis. In conclusion, hRes, an inflammatory protein, additionally exhibited chaperone-like properties, suggesting a possible link between inflammation and cellular stress. |
| تدمد: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.1306145110 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::04a8f1484be72689da6f4e4a335be1d4 https://doi.org/10.1073/pnas.1306145110 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....04a8f1484be72689da6f4e4a335be1d4 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10916490 00278424 |
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| DOI: | 10.1073/pnas.1306145110 |