RGD Reference Report - A Critical Evaluation of Liver Pathology in Humans with Danon Disease and Experimental Correlates in a Rat Model of LAMP-2 Deficiency. - Rat Genome Database

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

Authors: Wang, Lu  Wang, Jingbo  Cai, Weile  Shi, Yongquan  Zhou, Xinmin  Guo, Guanya  Guo, Changcun  Huang, Xiaofeng  Han, Zheyi  Zhang, Shuai  Ma, Shuoyi  Zhou, Xia  Fan, Daiming  Gershwin, M Eric  Han, Ying 
Citation: Wang L, etal., Clin Rev Allergy Immunol. 2017 Aug;53(1):105-116. doi: 10.1007/s12016-017-8598-3.
RGD ID: 13703118
Pubmed: PMID:28124283   (View Abstract at PubMed)
DOI: DOI:10.1007/s12016-017-8598-3   (Journal Full-text)

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.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
cholestasis  ISOLamp2 (Rattus norvegicus)13703118; 13703118in hemizygote mutant male (LAMP2y/-)RGD 
cholestasis  IMP 13703118; 13703118in hemizygote mutant male (LAMP2y/-)RGD 
cholestasis MODEL: inducedIMP 13703118in hemizygote mutant male (LAMP2y/-)RGD 

Phenotype Annotations    Click to see Annotation Detail View

Mammalian Phenotype

TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
abnormal mitophagy  IMP 13703118; 13703118; 13703118in hemizygote mutant male LAMP2y/-RGD 
increased circulating alkaline phosphatase level  IMP 13703118; 13703118; 13703118in hemizygote mutant male LAMP2y/-RGD 
increased circulating aspartate transaminase level  IMP 13703118; 13703118in hemizygote mutant male LAMP2y/-RGD 
increased circulating aspartate transaminase level  IMP 13703118 RGD 
increased circulating cholesterol level  IMP 13703118; 13703118in hemizygote mutant male LAMP2y/-RGD 
increased circulating cholesterol level  IMP 13703118 RGD 
increased circulating glucose level  IMP 13703118; 13703118in hemizygote mutant male LAMP2y/-RGD 
increased circulating glucose level  IMP 13703118 RGD 
intrahepatic cholestasis  IMP 13703118; 13703118in hemizygote mutant male LAMP2y/-RGD 
intrahepatic cholestasis  IMP 13703118 RGD 
premature death  IMP 13703118; 13703118in hemizygote mutant male LAMP2y/-RGD 
premature death  IMP 13703118 RGD 
slow postnatal weight gain  IMP 13703118; 13703118in hemizygote mutant male LAMP2y/-RGD 
slow postnatal weight gain  IMP 13703118 RGD 
Objects Annotated

Genes (Rattus norvegicus)
Lamp2  (lysosomal-associated membrane protein 2)
Lamp2em1  (lysosomal-associated membrane protein 2; TALEN induced mutant1)

Genes (Mus musculus)
Lamp2  (lysosomal-associated membrane protein 2)

Genes (Homo sapiens)
LAMP2  (lysosomal associated membrane protein 2)

Strains
SD-Lamp2em1  (NA)


Additional Information