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Updated: Aug 11, 2026

Cerenkov Luminescence Imaging of Interscapular Brown Adipose Tissue
Published on: October 7, 2014
Developmental changes in adenylyl cyclase and GTP binding proteins in brown fat
1Laboratory of Biochemical Pharmacology, Sinai Research Institute, Detroit, Michigan 48235.
Norepinephrine-stimulated adenylyl cyclase activity in brown fat increases during the perinatal period due to enhanced Gs alpha-catalytic subunit interaction, not Gi alpha changes.
Area of Science:
- Biochemistry
- Cellular Physiology
- Developmental Biology
Background:
- Brown adipose tissue (BAT) is crucial for thermogenesis, particularly during the perinatal period.
- Adenylyl cyclase activity regulation is vital for cellular signaling pathways.
- Guanine nucleotide-binding proteins (G proteins) modulate adenylyl cyclase function.
Purpose of the Study:
- To investigate the developmental changes in adenylyl cyclase activity in interscapular brown adipose tissue (IBAT) during the perinatal period.
- To elucidate the roles of stimulatory (Gs alpha) and inhibitory (Gi alpha) G proteins in regulating adenylyl cyclase activity during development.
- To determine the specific molecular mechanisms underlying the observed changes in adenylyl cyclase activity.
Main Methods:
- Measurement of norepinephrine (NE)- and NaF-stimulated adenylyl cyclase activity in IBAT membranes.
- Assessment of Gs alpha and Gi alpha protein levels and activity using cyc- reconstitution assays and pertussis toxin-catalyzed ADP-ribosylation.
- Evaluation of catalytic subunit (C) activity via forskolin-Mn(2+)-stimulated adenylyl cyclase activity.
Main Results:
- NE-stimulated adenylyl cyclase activity in IBAT increased during the perinatal period and declined to adult levels by 23 days postpartum.
- Developmental patterns of NE- and NaF-stimulated activities were similar, indicating increased Gs alpha-C subunit interaction.
- This interaction increase stemmed from elevated Gs alpha specific activity and catalytic subunit activity, despite a decline in total Gs alpha levels due to loss of the small-molecular-mass form.
Conclusions:
- The perinatal increase in IBAT adenylyl cyclase activity is primarily mediated by enhanced Gs alpha-C subunit interaction.
- Changes in Gi alpha-like proteins after birth do not significantly contribute to developmental alterations in adenylyl cyclase activity.
- The increased ratio of large to small Gs alpha forms may play a role in the perinatal surge of adenylyl cyclase activity.
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