Proinflammatory cytokines but not acute phase serum amyloid A or C-reactive protein, downregulate paraoxonase 1 (PON1) expression by HepG2 cells
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Updated: Sep 28, 2026
Induction of an Inflammatory Response in Primary Hepatocyte Cultures from Mice
Published on: March 10, 2017
Yoshitaka Kumon1, Yuh Nakauchi, Tadashi Suehiro
1Second Department of Internal Medicine, Kochi Medical School, Nankoku, Japan. kumony@kochi-ms.ac.jp
Abstract:
The expression of paraoxonase1 (PON1) during inflammation has been investigated in vitro. The alteration of steady state PON1 mRNA in HepG2 cells by interleukin-1beta (IL-1beta) and tumor necrosis factor-alpha (TNF-alpha), was investigated relative to acute-phase serum amyloid A (A-SAA) mRNA. PON1 mRNA expression by HepG2 cells was decreased within three hours of stimulation by IL-1beta or TNF-alpha. Relative to PON1 mRNA expression, the pattern of steady state A-SAA mRNA expression was altered reciprocally and inversely by IL-1beta. These findings suggested that the decrease in serum PON activity after abdominal surgery in our previous clinical study may be ascribed to a decrease in steady state PON1 mRNA expression by liver with proinflammatory cytokines.