NDLI: Dietary Calorie Restriction from Adulthood Through Old Age in Rats: Improved DNA Polymerase β and DNA Gap Repair Activity in Cortical Neurons

Content Provider	Springer Nature Link
Author	Swain, Umakanta Vyjayanti, V. N. Harikrishna, T. Mahipal, S. Rao, Kalluri Subba
Copyright Year	2016
Abstract	It is well established now that dietary calorie restriction (CR) leads to extension of life span in many species, although the exact mechanism of this effect is still eluding. In the present study, we examined the effect of 40 % CR imposed during a prolonged period of life span (from 6 to 30 months) of rats on the activity of DNA polymerase β (pol β) in view of its role in short gap base excision DNA repair and template driven primer extension. DNA pol β activity is very low at this late age. However, cortical neuronal extracts prepared from CR rats of 30 months age showed significantly higher pol β protein levels and activity when compared to control 30 month old rats. Yet, one-nucleotide gap repair in old control neurons and an improved efficiency in CR neurons could be visualized only after supplementation of the extracts with T$_{4}$ DNA ligase indicating the lack of CR affect on ligase activity. No impressive primer extension activity is seen either in the CR or old control neurons. These results are taken to convey that extended CR through adult life leads to improved pol β activity and therefore, pol β dependent DNA gap repair activity.
Starting Page	270
Ending Page	277
Page Count	8
File Format	PDF
ISSN	03643190
Journal	Neurochemical Research
Volume Number	41
Issue Number	1-2
e-ISSN	15736903
Language	English
Publisher	Springer US
Publisher Date	2016-01-22
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Base excision repair Neurons pol β Gap repair Dietary calorie restriction Neurosciences Neurochemistry Biochemistry Cell Biology Neurology
Content Type	Text
Resource Type	Article
Subject	Medicine Biochemistry Cellular and Molecular Neuroscience

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Dietary Calorie Restriction from Adulthood Through Old Age in Rats: Improved DNA Polymerase β and DNA Gap Repair Activity in Cortical Neurons

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Dietary Calorie Restriction from Adulthood Through Old Age in Rats: Improved DNA Polymerase β and DNA Gap Repair Activity in Cortical Neurons

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Dietary Calorie Restriction from Adulthood Through Old Age in Rats: Improved DNA Polymerase β and DNA Gap Repair Activity in Cortical Neurons