Abstract
1. In depression, psychiatric symptoms are frequently associated with impaired cardiovascular function and perhaps also increased risk for cancer diseases. Pathophysiological basis of this comorbidity is not clearly understood. Molecular events involved, particularly factors modified by chronic stress exposure, may only be evaluated in animal models of depression.
2. Present experiments were aimed to study parameters related to cardiovascular system (tyrosine hydroxylase (TH) gene expression in adrenal glands) and carcinogenesis (retinoic acid receptors in the liver) in the chronic mild stress model of depression.
3. Chronic mild stress induced a rise in adrenal TH gene expression in both male and female rats. Gender dependent changes were found in retinoic acid receptor binding with stress-induced activation in females but not males. Ovariectomized animals exhibited higher retinoic acid receptor binding, slightly elevated TH mRNA levels and failed to respond to chronic mild stress exposure with further increase in TH mRNA levels. Similarly, chronic mild stress induced an anhedonic state manifested by decreased sucrose preference in control but not ovariectomized rats.
4. Presented data document that central neurochemical and behavioral changes in animals exposed to chronic mild stress model of depression are associated with changes in adrenal TH gene expression and with gender dependent changes in retinoic acid receptor status in the liver. Such alterations may participate in the development of pathological changes and could participate on increased risk for cardiovascular and oncologic comorbidity in depressive patients.
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Duncko, R., Brtko, J., Kvetnanský, R. et al. Altered Function of Peripheral Organ Systems in Rats Exposed to Chronic Mild Stress Model of Depression. Cell Mol Neurobiol 21, 403–411 (2001). https://doi.org/10.1023/A:1012658222954
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DOI: https://doi.org/10.1023/A:1012658222954