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Circadian variations of neuropeptide Y-like immunoreactivity in the rat pineal gland.

Publication date: 1994-06-02

Keywords: Animals, Circadian Rhythm, physiology, Darkness, Immunoenzyme Techniques, Immunohistochemistry, Male, Neuropeptide Y, immunology, metabolism, Pineal Gland, Rats, Rats, Wistar

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Abstract

Neuropeptide Y, which is present in the sympathetic nerves innervating pineal glands, has been shown to affect N-acetyltransferase activity and melatonin production. Using enzyme immunoassay, we measured daily patterns of neuropeptide Y (NPY) in rat pineal glands in light-dark cycles (LD) and in constant darkness (DD). NPY within rat pineal glands displayed daily rhythms in LD with a peak at zeitgeber time 16. Similar rhythms in the NPY content were also observed in DD. These rhythms have a similar phase-relationship to that of the rhythm of NAT activity, suggesting that NPY in rat pineal glands plays a role in circadian rhythms of NAT activity.