Evaluation of biomarkers of stress in chronic stress-exposed comorbid depression model Wistar rats

Megha Gokul, Nayanatara Arun Kumar, Rekha Durgadas Kini, Vandana Blossom, Bhagyalakshmi Kodavanji, Anupama Noojibail, Nirupama Murali, Santhosh Phajir Vishwanath Rai

Research output: Contribution to journalArticle


In recent years, increased stress in human life has a dual effect on brain and body physiology. Chronic stress takes a toll on physiology as well as on quality of life, ultimately leading to affective disorders. Rodent models are indispensable tools for studying the etiology and progress of depression. C-reactive protein has been proposed as a novel inflammatory marker. Rats were divided into control and experimental stress groups (n = 6 each). The experimental group consisted of rats that were exposed to a set of chronic unpredictable stressors for 15 days. At the end of the 15th day, the animals were anesthetized, and blood samples were collected through cardiac puncture. Then the blood samples were analyzed for selected biochemical and oxidative stress parameters. Serum glutamic oxaloacetic transaminase (p < 0.0001), serum glutamic pyruvic transaminase (p < 0.001), serum malondialdehyde (p < 0.0001), total antioxidant level (p < 0.0001), and serum cortisol (p < 0.0001) were significantly increased in the stressed group when compared with the control group. C-reactive protein significantly (p < 0.0001) increased in the stressed group when compared with the control group. Our results demonstrate that chronic unpredictable stress ameliorated depression-like behavior, which might have caused the dysregulation of the hypothalamic-pituitary-adrenal axis, causing the imbalance in the biochemical and oxidative parameters increasing the inflammatory markers. The inflammation-induced model of the chronic unpredictable stress model of comorbid depression might provide a variety of new targets for antidepressant therapies.

Original languageEnglish
JournalJournal of Basic and Clinical Physiology and Pharmacology
Publication statusAccepted/In press - 01-01-2019


All Science Journal Classification (ASJC) codes

  • Physiology
  • Pharmacology
  • Drug Discovery

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