Corticosterone [HRP]

Corticosterone (CORT) is an important glucocorticoid widely present in rodents and birds. During stress responses, glucocorticoids play a crucial role in regulating homeostasis and responding to environmental changes. The chemical structure of corticosterone is similar to that of the primary human glucocorticoid, cortisol. The release of corticosterone is mainly regulated by the hypothalamic-pituitary-adrenal (HPA) axis. When an individual experiences acute or chronic stress, neurosecretory cells in the paraventricular nucleus of the hypothalamus release corticotropin-releasing factor (CRF) and arginine vasopressin (AVP), these hormones enter the pituitary portal system, stimulating the pituitary gland to release adrenocorticotropic hormone (ACTH), which ultimately leads to the secretion of corticosterone by the adrenal glands. In rodents, baseline corticosterone levels peak within 30 to 60 minutes after HPA axis activation. Additionally, corticosterone inhibits the release of CRF and ACTH through a negative feedback mechanism, thereby regulating its secretion levels.

Corticosterone is commonly used in clinical research to establish animal models of depression. Depression is a chronic mental disorder caused by multiple factors, with its pathogenesis not yet fully elucidated. However, it is closely related to biological, psychological, and social-environmental factors. Studies have found that serum cortisol levels in patients with depression are usually high, indicating that stress-related hormones play an important role in depression. Long-term exposure to glucocorticoids, such as corticosterone, can induce depression-like behaviors in experimental animals. This method involves adding 200 micrograms/milliliter of corticosterone to drinking water for a week, leading to depression- and anxiety-like behaviors in rodents, such as anhedonia, behavioral despair, and lack of self-care motivation. These models offer useful resources for researching the pathophysiological causes of depression and the effectiveness of antidepressant medications. In these models, lower levels of brain-derived neurotrophic factor (BDNF) and impaired neurogenesis in the prefrontal cortex and hippocampal regions are frequently observed in conjunction with corticosteroid-induced depression. Additionally, long-term exposure to corticosterone damages stress-related brain regions, leading to neuronal injury and reduced dendritic branching in the hippocampus and prefrontal cortex.

In recent years, the application of corticosterone in research has expanded to not only model depression but also explore other stress-related mental disorders, such as anxiety and schizophrenia. Chronic stress is considered an important factor leading to these disorders, and long-term exposure to corticosterone can trigger stress-related neuroplasticity changes. For example, studies have shown that long-term corticosterone treatment leads to neuronal damage in the prefrontal cortex and reduces the density of distal dendritic spines. Moreover, corticosterone is used to study the physiological mechanisms in migratory birds. During migration, corticosterone levels significantly increase, helping birds cope with the demands of flight and energy mobilization. In summary, as a key stress hormone, corticosterone is widely used in animal models to study depression and other stress-related mental disorders. By regulating corticosterone levels, researchers can simulate and study the effects of stress on organisms, revealing the mechanisms of stress-related diseases and exploring potential treatments.

Corticosterone horseradish peroxidase conjugate
Corticosterone-HRP conjugate
Corticosterone-HRP