Transient reduction in pineal melatonin levels but not n-acetyltransferase activity in rats forced to swim for 15 minutes at night

M. Ueck; M. E. Troiani; R. J. Reiter

Transient reduction in pineal melatonin levels but not n-acetyltransferase activity in rats forced to swim for 15 minutes at night

M. Ueck, M. E. Troiani, R. J. Reiter

Cell Systems & Anatomy

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Forcing rats to swim during darkness when pineal NAT activity and melatonin levels are high caused a marked and rapid reduction in the pineal melatonin content without affecting the activity of the acetylating enzyme. If rats were removed from the water after swimming for 15 min high nocturnal melatonin levels were restored within 105 min after swimming onset. Conversely, if rats swam continually for 105 min pineal melatonin levels remain depressed for the entire period. The drop in pineal melatonin, without a commensurate reduction in NAT activity, may be more related to the exercise of swimming rather than to the stress associated with this activity.

Original language	English (US)
Pages (from-to)	81-89
Number of pages	9
Journal	Neuroendocrinology Letters
Volume	10
Issue number	2
State	Published - Jan 1 1988

ASJC Scopus subject areas

Endocrinology, Diabetes and Metabolism
Endocrinology
Neurology
Endocrine and Autonomic Systems
Clinical Neurology
Psychiatry and Mental health

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title = "Transient reduction in pineal melatonin levels but not n-acetyltransferase activity in rats forced to swim for 15 minutes at night",

abstract = "Forcing rats to swim during darkness when pineal NAT activity and melatonin levels are high caused a marked and rapid reduction in the pineal melatonin content without affecting the activity of the acetylating enzyme. If rats were removed from the water after swimming for 15 min high nocturnal melatonin levels were restored within 105 min after swimming onset. Conversely, if rats swam continually for 105 min pineal melatonin levels remain depressed for the entire period. The drop in pineal melatonin, without a commensurate reduction in NAT activity, may be more related to the exercise of swimming rather than to the stress associated with this activity.",

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N2 - Forcing rats to swim during darkness when pineal NAT activity and melatonin levels are high caused a marked and rapid reduction in the pineal melatonin content without affecting the activity of the acetylating enzyme. If rats were removed from the water after swimming for 15 min high nocturnal melatonin levels were restored within 105 min after swimming onset. Conversely, if rats swam continually for 105 min pineal melatonin levels remain depressed for the entire period. The drop in pineal melatonin, without a commensurate reduction in NAT activity, may be more related to the exercise of swimming rather than to the stress associated with this activity.

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