Age-related changes in pineal 'synaptic' ribbon populations in rats exposed to continous light or darkness

Thomas S King, W. J. Dougherty

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

'Synaptic' ribbon (SR) populations in the rat pineal gland were analyzed morphometrically at various ages from birth to early adulthood. The rats were born and raised in continuous light or continuous darkness. SR numbers were high irrespective of the presence or absence or light during the early neonatal period. However, SR numbers decreased substantially during the second neonatal week of continuous light, remaining low at subsequent ages, including early adulthood. In contrast, SR numbers apparently remained elevated during continuous darkness at various ages from the early neonatal period to early adulthood. Stimulation of pineal adrenergic receptors with L-isoproterenol during continuous light resulted in an acute, reversible increase in SR numbers; blockade of these receptors with L-propranolol during continuous darkness resulted in an acute decrease in SR numbers. These results indicate that light-mediated changes in SR populations were 1) age related and 2) related to some component of the pineal beta-adrenergic receptor mechanism. A hypothesis that SR formation may be related to beta-adrenergic receptor-associated membrane turnover is presented.

Original languageEnglish (US)
Pages (from-to)169-179
Number of pages11
JournalAmerican Journal of Anatomy
Volume163
Issue number2
StatePublished - 1982
Externally publishedYes

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Darkness
Light
Population
Receptors, Adrenergic, beta
Pineal Gland
Isoproterenol
Propranolol
Adrenergic Receptors
Parturition
Membranes

ASJC Scopus subject areas

  • Anatomy

Cite this

Age-related changes in pineal 'synaptic' ribbon populations in rats exposed to continous light or darkness. / King, Thomas S; Dougherty, W. J.

In: American Journal of Anatomy, Vol. 163, No. 2, 1982, p. 169-179.

Research output: Contribution to journalArticle

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