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cAMP signalling mechanisms with aging in the Ceratitis capitata brain
I D Laviada1, I Galve-Roperh, J M Malpartida
1Departamento de Bioquímica y Biología Molecular I, Fac. Químicas, Universidad Complutense, Madrid, Spain.
Mechanisms of Ageing and Development
|July 1, 1997
Summary
Changes in cAMP-dependent protein kinase (PKA) activity and regulatory subunit levels were observed in the aging Ceratitis capitata brain. PKA activity was higher in mature flies, while aged flies showed increased cytosolic regulatory subunits, suggesting a regulatory response to aging.
Area of Science:
- Neuroscience
- Molecular Biology
- Gerontology
Background:
- Aging is linked to changes in protein phosphorylation.
- Cyclic adenosine monophosphate (cAMP)-dependent protein kinase (PKA) plays a crucial role in cellular signaling pathways.
- Understanding age-related alterations in kinase activity is vital for comprehending senescence.
Purpose of the Study:
- To investigate changes in PKA activity and its regulatory subunit levels in the brain of Ceratitis capitata during aging.
- To determine how PKA signaling is affected by postmaturational aging and senescence in insects.
Main Methods:
- Measurement of PKA activity in cytosolic and membrane brain fractions of Ceratitis capitata at different adult life stages.
- Quantification of regulatory (R) subunit levels in cytosolic and membrane fractions using immunoblotting.
Main Results:
- PKA activity significantly increased in both cytosolic and membrane fractions during early adult life.
- A secondary, lower peak of PKA activity was observed in the terminal aging phase.
- Brain PKA activity was notably higher in mature flies compared to aged flies.
- Cytosolic regulatory subunit levels increased in aged flies, while membrane-bound levels decreased with senescence.
Conclusions:
- Age-related changes in PKA activity and regulatory subunit levels occur in the insect brain.
- Increased cAMP-dependent protein phosphorylation may characterize neural aging.
- Elevated cytosolic R subunit levels in aged flies might represent a cellular mechanism to down-regulate the PKA system.