Abstract:
:Tissue nicotinamide adenine dinucleotide (NAD+) decline has been implicated in aging. We have recently identified CD38 as a central regulator involved in tissue NAD+ decline during the aging process. CD38 is an ecto-enzyme highly expressed in endothelial and inflammatory cells. To date, the mechanisms that regulate CD38 expression in aging tissues characterized by the presence of senescent cells is not completely understood. Cellular senescence has been described as a hallmark of the aging process and these cells are known to secrete several factors including cytokines and chemokines through their senescent associated secretory phenotype (SASP). Here we investigated if the cellular senescence phenotype is involved in the regulation of CD38 expression and its NADase activity. We observed that senescent cells do not have high expression of CD38. However, the SASP factors secreted by senescent cells induced CD38 mRNA and protein expression and increased CD38-NADase activity in non-senescent cells such as endothelial cells or bone marrow derived macrophages. Our data suggest a link between cellular senescence and NAD+ decline in which SASP-mediated upregulation of CD38 can disrupt cellular NAD+ homeostasis.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Chini C,Hogan KA,Warner GM,Tarragó MG,Peclat TR,Tchkonia T,Kirkland JL,Chini Edoi
10.1016/j.bbrc.2019.03.199subject
Has Abstractpub_date
2019-05-28 00:00:00pages
486-493issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(19)30606-0journal_volume
513pub_type
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