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Telmisartan attenuates diabetes induced depression in rats.
Pharmacological Reports : PR 2017 April
BACKGROUND: Role of brain renin angiotensin system (RAS) is well understood and various clinical studies have proposed neuroprotective effects of ARB's. It is also assumed that diabetic depression is associated with activation of brain RAS, HPA axis dysregulation and brain inflammatory events. Therefore, the present study was designed to investigate the antidepressant effect of low dose telmisartan (TMS) in diabetes induced depression (DID) in rats.
METHODS: Diabetes was induced by injecting streptozotocin. After 21days of treatment the rats were subjected to forced swim test (FST). The rats, with increased immobility time, were considered depressed and were treated with vehicle or TMS (0.05mg/kg, po) or metformin (200mg/kg, po) or fluoxetine (20mg/kg, po). A separate group was also maintained to study the combination of metformin and TMS. At the end of 21days of treatments, FST, open field test (OFT) and elevated plus maze (EPM) paradigm were performed. Blood was drawn to estimate serum cortisol, nitric oxide (NO), interleukin-6 (IL-6) and interleukin-1β (IL-1β).
RESULTS: Persistent hyperglycemia resulted in depression and anxiety in rats as observed by increased immobility, reduced latency for immobility, reduced open arm entries and time spent. The depressed rats showed a significant rise in serum cortisol, NO, IL-6 and IL-1β (p<0.001). TMS antagonized depression and anxiety. It also significantly attenuated serum cortisol, NO, IL-6 and IL-1β (p<0.001).
CONCLUSIONS: Low dose TMS and its combination with metformin normalizes depressive mood, reduces pro-inflammatory mediators and ameliorates the HPA axis function; thereby providing beneficial effects in DID.
METHODS: Diabetes was induced by injecting streptozotocin. After 21days of treatment the rats were subjected to forced swim test (FST). The rats, with increased immobility time, were considered depressed and were treated with vehicle or TMS (0.05mg/kg, po) or metformin (200mg/kg, po) or fluoxetine (20mg/kg, po). A separate group was also maintained to study the combination of metformin and TMS. At the end of 21days of treatments, FST, open field test (OFT) and elevated plus maze (EPM) paradigm were performed. Blood was drawn to estimate serum cortisol, nitric oxide (NO), interleukin-6 (IL-6) and interleukin-1β (IL-1β).
RESULTS: Persistent hyperglycemia resulted in depression and anxiety in rats as observed by increased immobility, reduced latency for immobility, reduced open arm entries and time spent. The depressed rats showed a significant rise in serum cortisol, NO, IL-6 and IL-1β (p<0.001). TMS antagonized depression and anxiety. It also significantly attenuated serum cortisol, NO, IL-6 and IL-1β (p<0.001).
CONCLUSIONS: Low dose TMS and its combination with metformin normalizes depressive mood, reduces pro-inflammatory mediators and ameliorates the HPA axis function; thereby providing beneficial effects in DID.
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