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Ann Surg. Oct 1988; 208(4): 532–540.
PMCID: PMC1493759

Intestinal gram-negative bacterial overgrowth in vivo augments the in vitro response of Kupffer cells to endotoxin.

Abstract

A number of disease states and therapeutic maneuvers common to surgical patients can result in changes in the intestinal flora, permitting bacterial overgrowth and translocation of bacteria to gut lymphoid tissue. It is possible that these changes in gut flora increase portal levels of several factors that are capable of altering macrophage activation state, including endotoxin, lymphokines, and eicosanoids. Since Kupffer cells are directly exposed to gut factors via the portal circulation, changes in intestinal flora may influence Kupffer cell responses. Using germfree rats, it has previously been shown that the presence of gut bacterial flora is important in inducing Kupffer cells to respond to endotoxin, and that an overgrowth of gram-negative bacteria can further augment Kupffer cell responses, supporting the above-mentioned hypothesis. The current set of experiments examines how intestinal gram-negative bacterial overgrowth in normal adult rats effects the response of Kupffer cells to septic stimuli. Kupffer cells were obtained from conventional rats with induced intestinal overgrowth with Escherichia coli C25 for 2 or 7 days. After 2 days of overgrowth, Kupffer cells were only slightly less responsive to lipopolysaccharide (LPS) than control Kupffer cells. However, after 7 days of overgrowth, when placed in coculture with normal hepatocytes, Kupffer cells were significantly more responsive to LPS (p less than 0.001), inducing a greater degree of suppression in hepatocyte protein synthesis at lower LPS concentrations. When cultured alone, Kupffer cells from these animals also produced more interleukin-1 (p less than 0.002) and prostaglandin E2 (PGE2) (p less than 0.009) in response to LPS. These results show that intestinal gram-negative bacterial overgrowth in conventional rats can have direct influences on the response of hepatic macrophages to septic stimuli, and provides further support to the hypothesis that imbalances in the intestinal flora can effect the responses of immune cells in other sites of the body.

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Selected References

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