Abstract
To find out whether the immunohistochemical expression of neuropeptid Y (NPY) and leptin receptor (LR) in the rat hypothalamus is influenced by adlay seed water extract (adlay), obesity in rats was induced by high fat diet (HFD) for 8 weeks; these rats were injected with 50 mg/100 g body weight adlay daily for 4 weeks. The results showed that the optical density of NPY immunoreactivity in paraventricular nucleus of rats increased approximately by 3.4 fold in HFD group compared to the normal diet group. Conversely, that of HFD + adlay group was about 2.6 fold lower than HFD group. The pattern of LR expression was similar to that of NPY. Both of NPY and LR mRNA levels, determined by real time PCR, in HFD + adlay group were decreased compared to those of HFD group, but there were no significant changes in the level of LR. These results suggest that adlay may regulate neuroendocrine activity in the brain. Accordingly, administration of adlay may be considered for therapies targeting obesity.
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