Vascular endothelial cells and smooth muscle cells mediate carbachol-induced hepatocyte proliferation via muscarinic receptors and IP3/PKC signaling cascades.

Abstract:

:An acetylcholine (ACh) agonist, carbachol (Cch), causes hepatocytes to proliferate in the presence of hepatic nonparenchymal cells (HNPCs). To identify the HNPCs and ACh receptor subtypes involved in carbachol-induced hepatocyte proliferation (CIHP), we examined two types of vascular cells as candidates for HNPCs mediating CIHP in cocultures of hepatocytes using the Transwell filter insert. In the coculture with vascular smooth muscle cells (VSMCs) or endothelial cells (VECs), but not in the monoculture, 72 h treatment with Cch significantly increased the numbers of hepatocytes. The results suggest that both VSMCs and VECs are involved in CIHP through soluble factors secreted from these cells. Interestingly, coculture with VECs, but not with VSMCs, markedly increased the number of hepatocytes, even in the absence of Cch. Cell proliferation assays using an analogue of thymidine, bromodeoxyuridine (BrdU), demonstrated that the hepatocytes in both cocultures transiently replicated their chromosomes 12 h after Cch administration. Blocking the muscarinic type 1 ACh receptor (M1), M3/5, intracellular inositol triphosphate (IP3) receptor, or protein kinase C (PKC) pathways inhibited VSMC-mediated CIHP, whereas blocking the M3/5, IP3 receptor, or PKC pathways inhibited VEC-mediated CIHP. Co-culturing hepatocytes with both types of vascular cells markedly increased their albumin content, but addition of Cch had no effect. In conclusion, VSMCs among vascular cells mediate CIHP through M1, M3/5, and IP3/PKC signal transduction pathways, whereas VECs do so through M3/5, and IP3/PKC pathways.

journal_name

Cell Biol Int

authors

Yoshimura R,Arai J,Endo Y

doi

10.1016/j.cellbi.2009.01.018

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

516-23

issue

4

eissn

1065-6995

issn

1095-8355

pii

S1065-6995(09)00034-1

journal_volume

33

pub_type

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