Abstract
Intracellular catabolism of NAD in mammalian cells occurs mainly via reaction catalyzed by poly(ADP-ribose) polymerase (PARP) with the release of nicotinamide, which is then metabolized predominantly to N-methyl-2-pyridone-5-carboxamide (2PY). PARP could be activated by binding to broken DNA and is known to be involved in DNA repair mechanisms, cell stress response and regulation of apoptosis. 2PY may accumulate under disease conditions resulting in accelerated DNA damage and retention of catabolic products. Our hypothesis was that chronic renal failure would lead to elevation of 2PY and potentially to inhibition of PARP and related physiological mechanisms. In the present study we: (a) compared plasma 2PY concentration in healthy subjects and in patients with chronic renal failure (CRF); (b) evaluated the relationship between plasma 2PY concentration and the severity of CRF; (c) evaluated the effect of hemodialysis treatment and kidney transplantation on 2PY concentration.
We found that the plasma 2PY concentration in healthy subjects is 0.83 ± 0.18 μM but it could increase up to 40 μM in patients with CRF. A significant correlation was found in CRF between plasma 2PY and creatinine concentration. A single hemodialysis treatment was associated with significant reduction of plasma 2PY concentration after the hemodialysis, but it increased rapidly 48 h after the end of treatment. Successful kidney transplantation was associated with return of 2PY concentration to the normal range.
In conclusion, our results indicated significant production of 2PY in humans. In healthy subjects 2PY is cleared from the plasma by excretion in the urine. Altered excretion by the kidney leads to increase in plasma concentration of 2PY. It is possible that 2PY may play a significant role in the development of uremic toxemia, especially as an inhibitor of poly(ADP-ribose)polymerase.
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Slominska, E.M., Smolenski, R.T., Szolkiewicz, M. et al. Accumulation of plasma N-methyl-2-pyridone-5-carboxamide in patients with chronic renal failure. Mol Cell Biochem 231, 83–88 (2002). https://doi.org/10.1023/A:1014445329756
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DOI: https://doi.org/10.1023/A:1014445329756