Aberrant expressions of aquaporin-1 in association with capillarized sinusoidal endothelial cells in cirrhotic rat liver.

Abstract:

:Aquaporins (AQPs) are key regulators of water channels across the cell cytoplasm. Little is known about AQP localization and changes in the hepatic microvascular system. This study aimed to clarify the localization of AQP-1 in the microvessels in normal and cirrhotic rat liver. To establish a rat cirrhosis model, thioacetamide (TAA) was injected for 24 weeks. AQP-1 in liver specimens was examined by immunohistochemistry (IHC), Western blotting, and immunoelectron microscopy (IEM). IHC revealed that AQP-1 was localized in hepatic sinusoids, especially on the liver sinusoidal endothelial cells (LSECs), predominantly in zone 1 in control rats, whereas AQP-1 immunoreactivity was increased on LSECs in central portions of regenerative nodules in cirrhotic rats, and was expressed especially strongly on the outer side of the duplicated liver cell cords. IEM demonstrated that, in control livers, AQP-1 was mainly expressed on the plasma membrane of LSECs in zone 1. In cirrhotic livers, many immunogold particles showing the presence of AQP-1 were seen on the LSECs in central portions of regenerative nodules, and the number was significantly greater than that in zone 3 of control liver. Protein levels of AQP-1 examined by Western blot were almost the same in the cirrhotic liver and control liver. AQP-1 immunoreactivities were aberrantly expressed on LSECs in central portions of regenerative nodule (CPRN) of cirrhotic liver, which may be associated with capillarization of LSECs and remodeling in this region.

journal_name

Med Mol Morphol

authors

Yokomori H,Oda M,Yoshimura K,Watanabe S,Hibi T

doi

10.1007/s00795-009-0475-6

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

6-12

issue

1

eissn

1860-1480

issn

1860-1499

journal_volume

43

pub_type

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