Abstract
We investigated the response of macrophages and perisinusoidal (Ito) cells (PSCs) during the development of secondary biliary cirrhosis after ligation and division of the common bile duct. Liver tissue was obtained from three groups of male Wistar rats: 1) untreated controls (n = 3); 2) common bile duct-ligated (CBDL) animals (n = 15); and 3) sham-operated controls (n = 15). Material from animal groups 2 and 3 was obtained on days 3, 7, 14, 21, and 28 after operation; in all animals 5-bromo-2-deoxyuridine was administered intraperitoneally before death. Monocytes and macrophages were detected using the monoclonal antibody ED1 and tissue macrophages using the antibody ED2. Cell proliferation within the macrophage population was demonstrated by double labeling for ED2 and incorporated 5-bromo-2-deoxyuridine. PSCs were demonstrated in tissue sections by immunolocalization of desmin; proliferating PSCs were identified by double labeling for desmin and incorporated 5-bromo-2-deoxyuridine. Evidence of phenotypic modulation of PSCs was sought using anti-alpha-smooth muscle actin (alpha-SMA) antibody. Increased numbers of ED1- and ED2-positive cells were seen in CBDL animals at all time points. Local proliferation of macrophages could be identified and reached a peak at day 3, thereafter falling toward control values. Compared with those of controls, livers of CBDL animals showed increased numbers of desmin-positive PSCs in periportal zones from day 3 on, reaching a peak at day 14 (127.8 +/- 10.99 cells/0.635 mm2) and followed by a plateau. PSC proliferation peaked at days 3 and 7 (labeling indices 11.2% and 11.2%, respectively) and thereafter fell toward control values; no expansion of the PSC population was seen in sham-operated rats. Increased alpha-SMA-positive cells were also noted from day 3, with a peak at day 21 (231.1 +/- 11.52 cells/0.635 mm2) and followed by a plateau. En face labeling experiments in days 14, 21, and 28 CBDL animals showed cells co-expressing alpha-SMA and desmin and cells expressing alpha-SMA alone. These results indicate that in response to chronic cholestatic liver injury, PSCs proliferate and undergo phenotypic modulation toward "myofibroblast-like" cells. The kinetics of the response are similar to those of the ED2-positive cell population in keeping with a hypothesis that PSC proliferation and activation may be mediated by factors released by macrophages in response to various forms of liver injury. We conclude that the responses of macrophages and PSCs to cholestatic injury are similar to those after toxin-induced hepatocyte necrosis.
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