Identification of novel molecular candidates for fatty liver in the hyperlipidemic mouse model, HcB19.
The inbred HcB19 mouse strain expresses a truncated form of thioredoxin interacting protein and is phenotypically characterized by fatty liver and elevated plasma triglycerides and VLDL. Recently, these mice have been proposed as an animal model for familial combined hyperlipidemia. The aim of the present study was identification of hepatic proteins specifically associated with the presence of fatty liver. Eighteen differential proteins were detected in whole-liver homogenate from HcB19, or the parental strain C3H, using 2D electrophoresis, and 11 of those were successfully identified by mass spectrometry. Five of the identified differential proteins were mitochondrial, two peroxisomal, two cytosolic, and two secretory. Four differential proteins were novel in the fatty liver proteome [i.e., aconitase, succinate dehydrogenase, propionyl CoA carboxylase alpha chain (PCCA), and 3-hydroxyanthranilate 3,4 dioxygenase (3HAAO)]. Of these, PCCA and 3HAAO are of particular interest because of their known functions in nicotinic acid metabolism (3HAAO) and ketogenesis (PCCA). We have newly identified several differential proteins in the hepatic proteome of mice with fatty liver, including PCCA and 3HAAO, and confirmed differential expression of previously reported proteins. These individual proteins, PCCA and 3HAAO, can be important in development of fatty liver or in the expression of hyperlipidemia.
Van Greevenbroek
Marleen M J
MM
Cardiovascular Research Institute Maastricht and Department of Internal Medicine, Maastricht University, UNS 50/Box 14, P.O. Box 616, 6200 MD Maastricht, The Netherlands. m.vgreevenbroek@intmed.unimaas.nl
Vermeulen
Vicky M M-J
VM
De Bruin
Tjerk W A
TW
D000818:Animals; D004195:Disease Models, Animal; D015180:Electrophoresis, Gel, Two-Dimensional; D005234:Fatty Liver / Q000150:complications* / Q000235:genetics / Q000378:metabolism*; D005260:Female; D006949:Hyperlipidemias / Q000097:blood / Q000150:complications* / Q000235:genetics / Q000378:metabolism*; D008297:Male; D051379:Mice; D010641:Phenotype; D020543:Proteome / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D040901:Proteomics; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
D020543:Proteome