Abstract:
:The metabolism of poly(ADP-ribose) in peripheral blood mononuclear (PBM) cells was studied in 13 patients with systemic lupus erythematosus (SLE) and in 12 age and sex matched controls. Poly(ADP-ribose) polymerase activity was measured as the net accumulation of ADP-ribose polymers during the conversion of 32P-NAD to poly(ADP-ribose) in PBM cells in vitro. The control population showed a mean activity of 418 +/- 91(s.d.)pmol ADP-ribose/10 min/10(6) cells. The SLE population was more heterogeneous and showed a lower mean of 225 +/- 147(s.d.)pmol ADP-ribose/10 min/10(6) cells. The mechanism of decreased ADP-ribose polymer accumulation was investigated. Measurements of turnover of the ADP-ribose polymers and its substrate, NAD+, showed that diminished ADP-ribose polymer accumulation in SLE subjects resulted from decreased poly(ADP-ribose) synthesis and not from altered rates of polymer turnover or NAD utilization. Western blot analyses of enzyme protein levels, kinetic studies of poly(ADP-ribose) polymerase activity and analyses of polymer size distribution suggested that the mechanisms of poly(ADP-ribose) synthesis in SLE cells is not altered but that the number of active poly(ADP-ribose) polymerase molecules is reduced.
journal_name
Lupusjournal_title
Lupusauthors
Chen HY,Pertusi RM,Kirkland JB,Rubin BR,Jacobson ELdoi
10.1177/096120339600500105subject
Has Abstractpub_date
1996-02-01 00:00:00pages
14-21issue
1eissn
0961-2033issn
1477-0962journal_volume
5pub_type
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