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26.01.2017 | Ausgabe 1/2017

Clinical Reviews in Allergy & Immunology 1/2017

A Critical Evaluation of Liver Pathology in Humans with Danon Disease and Experimental Correlates in a Rat Model of LAMP-2 Deficiency

Zeitschrift:
Clinical Reviews in Allergy & Immunology > Ausgabe 1/2017
Autoren:
Lu Wang, Jingbo Wang, Weile Cai, Yongquan Shi, Xinmin Zhou, Guanya Guo, Changcun Guo, Xiaofeng Huang, Zheyi Han, Shuai Zhang, Shuoyi Ma, Xia Zhou, Daiming Fan, M. Eric Gershwin, Ying Han
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s12016-017-8598-3) contains supplementary material, which is available to authorized users.
Lu Wang and Jingbo Wang contributed equally to this work.

Abstract

Danon disease is a genetic deficiency in lysosome-associated membrane protein 2 (LAMP-2), a highly glycosylated constituent of the lysosomal membrane and characterized by a cardiomyopathy, skeletal muscle myopathy, and cognitive impairment. Patients, however, often manifest hepatic abnormalities, but liver function has not been well evaluated and the syndrome is relatively uncommon. Hence, we have taken advantage of a rat that has been deleted of LAMP-2 to study the relative role of LAMP-2 on liver function. Interestingly, rats deficient in LAMP-2 develop a striking increase in serum alkaline phosphatase (ALP) and a decrease in bile flow compared with wild-type littermates. Importantly and by ultrastructural analysis, deficient rats manifest dilated canaliculi that lack microvilli with evidence of bile-containing bodies. Moreover, following bile duct ligation, LAMP-2-deficient rats develop rapid and severe evidence of advanced cholestasis, with an increase in serum bilirubin, as early as 6 h later. In wild-type control rats, multidrug resistance-associated protein 2 (Mrp2) normally concentrates at the bile canalicular membranes to secrete conjugated bilirubin into bile. However, in LAMP-2y/− rats, Mrp2 was detected in hepatocytes compared with other canalicular proteins including P-glycoproteins, dipeptidyl peptidase IV (CD26), and aminopeptidase (CD13). Our data further suggest that LAMP-2 interacts with the membrane cytoskeletal proteins radixin and F-actin in determining the localization of integral membrane proteins.

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