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Effects of aging on cholinephosphotransferase activity on guinea pig lung mitochondria and microsomes

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Abstract

It is known that the composition of phospholipids in lung changes with age. The final step in thede novo synthesis of phosphatidylcholine, a major component of lung surfactant, by the CDP-choline pathway, requires the enzyme cholinephosphotransferase (CPT). Even though CPT has earlier been proposed to be located exclusively in the endoplasmic reticulum, we have recently demonstrated its presence also in the mitochondria. We have earlier reported a gestational variation of CPT activity in fetal mitochondria and microsomes. In the present study we examined the subcellular distribution of CPT activity in lung as a function of age. After birth, the microsomal CPT activity continued to increase until adulthood (24 wks of age), thereafter it gradually decreased. On the otherhand, the CPT activity of mitochondria continued to increase with the advancement of age and beyond 72 wks of age, it was approximately 2-fold higher than that of the microsomal fraction.

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  1. Department of Biochemistry, Meharry Medical College, 37208, Nashville, TN, USA

    Salil K. Das, Pampa Chakrabarti & Shyamali Mukherjee

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  1. Salil K. Das
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  2. Pampa Chakrabarti
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  3. Shyamali Mukherjee
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Das, S.K., Chakrabarti, P. & Mukherjee, S. Effects of aging on cholinephosphotransferase activity on guinea pig lung mitochondria and microsomes. Mol Cell Biochem 121, 31–36 (1993). https://doi.org/10.1007/BF00928697

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  • DOI: https://doi.org/10.1007/BF00928697

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