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In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells
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Correlation of changes in pineal gland cAMP metabolism with light-mediated decrease in N-acetyltransferase activity.

L Alphs1, L P Miller, W Lovenberg

  • 1Section on Biochemical Pharmacology, Hypertension-Endocrine Branch, National Heart, Lung and Blood Institute, Bethesda, MD 20205, U.S.A.

Neurochemistry International
|May 22, 2010
PubMed
Summary
This summary is machine-generated.

Light exposure rapidly decreases rat pineal N-acetyltransferase (NAT) activity. Cyclic adenosine monophosphate (cAMP) levels show a biphasic response, initially decreasing then increasing significantly with sustained light.

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Area of Science:

  • Neuroendocrinology
  • Chronobiology
  • Biochemistry

Background:

  • The rat pineal gland's N-acetyltransferase (NAT) activity is regulated by light.
  • Cyclic adenosine monophosphate (cAMP) is a key intracellular second messenger involved in various signaling pathways.

Purpose of the Study:

  • To investigate the relationship between light-induced decreases in rat pineal NAT activity and alterations in cAMP metabolism.
  • To elucidate the role of adenylate cyclase and phosphodiesterase in mediating these light-dependent changes in cAMP.

Main Methods:

  • Exposure of dark-adapted rats to light for varying short durations (0-10 minutes).
  • Measurement of pineal N-acetyltransferase (NAT) activity and cyclic adenosine monophosphate (cAMP) levels.
  • Pharmacological interventions including phenoxybenzamine pretreatment and propranolol administration.
  • Assay of adenylate cyclase and phosphodiesterase enzyme activities.

Main Results:

  • Short light exposure (0-10 min) caused a rapid decrease in pineal NAT activity.
  • cAMP levels exhibited a biphasic response: a 50% decrease at 30 s, followed by a 2-3 fold increase above control at 6 min.
  • Increased adenylate cyclase activity was observed after 6 min of light exposure.
  • Light-induced responses were blocked by phenoxybenzamine; the initial cAMP decrease was mimicked by propranolol.

Conclusions:

  • Light exposure triggers complex, biphasic changes in pineal cAMP metabolism that correlate with NAT activity regulation.
  • The findings suggest a role for adenylate cyclase in mediating the sustained increase in cAMP under prolonged light.
  • Results provide in vivo insights into pinealocyte responses to light, comparing them with cultured cell studies.