{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T02:33:44Z","timestamp":1791426824321,"version":"4.3.3"},"reference-count":45,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2010,9,13]],"date-time":"2010-09-13T00:00:00Z","timestamp":1284336000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Phytotherapy Research"],"published-print":{"date-parts":[[2011,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Cognitive impairment occurs in diabetes mellitus. <jats:italic>Hypericum perforatum<\/jats:italic> has been used in folk medicine to improve mental performance. Here it is hypothesized that chronic treatment with an extract of <jats:italic>Hypericum perforatum<\/jats:italic> (6, 12 and 25\u2009mg\/kg, p.o.) would have effects on passive avoidance learning (PAL) and memory in control and streptozotocin\u2010induced diabetic rats. Treatments were begun at the onset of hyperglycaemia. PAL was assessed 30 days later. A retention test was done 24\u2009h after training. At the end, the animals were weighed and blood samples were drawn for plasma glucose measurement. Diabetes caused impairment in acquisition and retrieval processes of PAL and memory. Hypericum treatment (12 and 25\u2009mg\/kg) improved learning and memory in control rats and reversed learning and memory deficits in diabetic rats. A dose of 6\u2009mg\/kg did not affect cognitive function. Hypericum administration did not alter the body weight and plasma glucose levels. Antioxidant properties and cholinergic facilitatory effects of Hypericum may be involved in its nootropic effects. These results show that <jats:italic>Hypericum perforatum<\/jats:italic> prevented the deleterious effects of diabetes on PAL and memory. As Hypericum would be free of major side effects compared with other nootropic medications, it may provide a new potential alternative for demented diabetic patients. 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