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NDT Advance Access published online on August 31, 2004
Nephrology Dialysis Transplantation, doi:10.1093/ndt/gfh478
© 2004 by European Renal Association - European Dialysis and Transplant Association
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Received December 9, 2002
Accepted June 28, 2004

Original Article

Effect of lactate and bicarbonate on human peritoneal mesothelial cells, fibroblasts and vascular endothelial cells, and the role of basic fibroblast growth factor

Satoshi Ogata 1, Takayuki Naito 2, Noriaki Yorioka 3*, Kei Kiribayashi 3, Masatoshi Kuratsune 3, Nobuoki Kohno 3

1 Department of Internal Medicine, National Kure Medical Center, Kure, Japan
2 Department of Internal Medicine, National Kure Medical Center, Kure, Japan; Department of Molecular and Internal Medicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
3 Department of Molecular and Internal Medicine, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan

* To whom correspondence should be addressed. E-mail: nyorioka{at}hiroshima-u.ac.jp.



  Abstract

Background. In patients on long-term continuous ambulatory peritoneal dialysis (CAPD), peritoneal dysfunction may occur due to loss of peritoneal mesothelial cells, peritoneal fibrosis and neovascularization. Lactate, long used as a buffer in peritoneal dialysates, has been substituted by bicarbonate in recent years. However, their effects on the peritoneum of CAPD patients are unknown. This study investigated the influence of lactate and bicarbonate on peritoneal dysfunction in CAPD patients.

Methods. The mitochondrial activity of human peritoneal mesothelial cells (HPMCs) and their expression of basic fibroblast growth factor (bFGF) were studied after culture under various conditions. We also assessed the mitochondrial-activating effect of the supernatant of those cultures on human peritoneal fibroblasts (HPFBs) and human umbilical vein endothelial cells (HUVECs) and the effect of recombinant human bFGF on the mitochondrial activity of HPFBs and HUVECs. We used the WST-1 assay to determine mitochondrial activity in HPMC.

Results. At pH 7.4, the mitochondrial activity of HPMCs was lowest in a medium containing 40 mM (Lac), intermediate in a lactate (15 mM) plus bicarbonate (25 mM) medium (Lac/Bic), and highest in a 40 mM bicarbonate medium (Bic). In culture supernatant, the increase of bFGF was: Lac>Lac/Bic>Bic. Mitochondrial activation of HPFBs and HUVECs was stimulated by HPMC culture supernatants in the following decreasing order: Lac>Lac/Bic>Bic. The effects of these supernatants were suppressed by a bFGF-neutralizing antibody, while recombinant bFGF caused concentration-dependent mitochondrial activation in HPFBs and HUVECs.

Conclusions. The role of bFGF in peritoneal fibrosis and neovascularization may be important. A bicarbonate-containing medium is better than a lactate-containing medium for preserving cell viability in HPMCs and preventing bFGF expression by these cells.

Keywords: fibrosis; growth factors; peritoneal dialysis; vascular reactivity.
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