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2015 ; 47
(3
): 263-9
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Cognitive enhancing effect of angiotensin-converting enzyme inhibitors and
angiotensin receptor blockers on learning and memory
#MMPMID26069362
Nade VS
; Kawale LA
; Valte KD
; Shendye NV
Indian J Pharmacol
2015[May]; 47
(3
): 263-9
PMID26069362
show ga
OBJECTIVE: The present study was designed to investigate cognitive enhancing
property of angiotensin-converting enzymes inhibitors (ACEI) and angiotensin
receptor blockers (ARBs) in rats. MATERIALS AND METHODS: The elevated plus maze
(EPM), passive avoidance test (PAT), and water maze test (WMT) were used to
assess cognitive enhancing activity in young and aged rats. Ramipril (10 mg/kg,
p.o.), perindopril (10 mg/kg, i.p), losartan (20 mg/kg, i.p), and valsartan (20
mg/kg, p.o) were administered to assess their effect on learning and memory.
Scopolamine (1 mg/kg, i.p) was used to impair cognitive function. Piracetam (200
mg/kg, i.p) was used as reference drug. RESULTS: All the treatments significantly
attenuated amnesia induced by aging and scopolamine. In EPM, aged and
scopolamine-treated rats showed an increase in transfer latency (TL) whereas,
ACEI and ARBs showed a significant decrease in TL. Treatment with ACEI and ARBs
significantly increased step down latencies and decreased latency to reach the
platform in target quadrant in young, aged and scopolamine-treated animals in PAT
and WMT, respectively. The treatments inhibited acetylcholinesterase (AChE)
enzyme in the brain. Similarly, all the treatments attenuated scopolamine-induced
lipid peroxidation and normalize antioxidant enzymes. CONCLUSION: The results
suggest that the cognitive enhancing effect of ACEI and ARBs may be due to
inhibition of AChE or by regulation of antioxidant system or increase in
formation of angiotensin IV.