Thursday, July 15, 2010

Cashew Seed Extract an Effective Anti-Diabetic ?

Cashew seed extract (hydroethanolic extract) shows promise as an effective anti-diabetic, according to a new study from the University of Montreal (Canada) and the Université de Yaoundé (Cameroun). The investigation analyzed the reputed health benefits of cashew tree products on diabetes, notably whether cashew extracts could improve the body's response to its own insulin.
The researchers claims that hydroethanolic extract of cashew seed (CSE) and its active component, anacardic acid (see structure), stimulated glucose transport into C2C12 myotubes in a concentration-dependent manner. Extracts of other parts (leaves, bark and apple) of cashew plant were inactive. Significant synergistic effect on glucose uptake with insulin was noticed at 100 g/mL CSE. CSE and AA caused activation of adenosine monophosphate-activated protein kinase in C2C12 myotubes after 6 h of incubation. No significant effect was noticed on Akt and insulin receptor phosphorylation. Both CSE and AA exerted significant uncoupling of succinate-stimulated respiration in rat liver mitochondria.
"Of all the extracts tested (out of leaves, bark, seeds and apples), only cashew seed extract significantly stimulated blood sugar absorption by muscle cells," says senior author Pierre S. Haddad, a pharmacology professor at the University of Montreal's Faculty of Medicine. "Extracts of other plant parts had no such effect, indicating that cashew seed extract likely contains active compounds, which can have potential anti-diabetic properties."

Researchers conclude that, activation of adenosine monophosphate-activated protein kinase by CSE and AA likely increases plasma membrane glucose transporters, resulting in elevated glucose uptake. In addition, the dysfunction of mitochondrial oxidative phosphorylation may enhance glycolysis and contribute to increased glucose uptake. These results collectively suggest that CSE may be a potential anti-diabetic nutraceutical.
Cashew tree products have long been reported to be effective anti-inflammatory agents, counter high blood sugar and prevent insulin resistance among diabetics. This study validates the traditional use of cashew tree products in diabetes and points to some of its natural components that can serve to create new oral therapies...

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