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Thyroid status and adenosine content of adipose tissue
J J Ohisalo1, S Stoneham, L Keso
1Department of Medical Chemistry, University of Helsinki, Finland.
The Biochemical Journal
|September 1, 1987
Summary
Hypothyroid fat cells show reduced lipolysis due to increased adenosine sensitivity. Thyroid hormones normalize this by increasing adenosine levels, preventing desensitization.
Area of Science:
- Endocrinology
- Metabolic research
- Adipose tissue biology
Background:
- Hypothyroidism impairs fat cell lipolysis.
- This impairment is linked to adenosine's inhibitory effects.
- Thyroid hormones' role in regulating lipolysis and adenosine is unclear.
Purpose of the Study:
- To investigate the role of adenosine in the impaired lipolytic response of fat cells in hypothyroidism.
- To determine if thyroid hormones influence adipose-tissue adenosine levels.
- To elucidate the mechanism by which adenosine affects lipolysis in hypothyroid states.
Main Methods:
- Studied lipolytic response to catecholamines in fat cells from hypothyroid rats.
- Assessed sensitivity to inhibitory actions of endogenous adenosine.
- Measured adipose-tissue adenosine content in euthyroid and hypothyroid states.
- Investigated the effect of thyroid hormone administration.
Main Results:
- Fat cells from hypothyroid rats exhibited a blunted lipolytic response to catecholamines.
- This reduced response correlated with increased sensitivity to adenosine.
- Thyroid hormones were found to increase adenosine content in adipose tissue.
- Hypothyroidism-induced adenosine sensitivity appears to result from relief of desensitization.
Conclusions:
- Thyroid hormones play a crucial role in regulating lipolysis via adenosine pathways in adipose tissue.
- Increased adenosine sensitivity in hypothyroidism contributes to impaired fat mobilization.
- Restoration of thyroid hormone levels may normalize lipolytic function by modulating adenosine signaling.