The liver is the major metabolic organ in the body and secretes a large number of proteins into the blood plasma. Membrane traffic in the secretory and endocytic pathways is also vital to cellular organization and function. The general process of protein transport has been elucidated and is highly similar in the different eukaryotic cell systems studied. The Golgi apparatus is responsible for the sorting and targeting of proteins in transit through these pathways. Recent studies have identified several abundant integral membrane protein species that reside in different compartments of the rat liver Golgi apparatus. These proteins may be essential to the organization and function of the Golgi apparatus, yet no clues are available to their roles. Antibodies raised against two of these liver Golgi membrane proteins recognize specific proteins from whole yeast S. cerevisiae lysates. A growing body of evidence suggests that various aspects of the secretory pathway are functionally conserved in yeast and mammals. The structural similarity of yeast proteins with liver Golgi membrane proteins implies that their functional role in cellular processes may also be conserved. These observations provide tremendous opportunities to investigate the role of these proteins in Golgi apparatus functions with the tools of yeast genetics, molecular and cell biology.
The aim of this pilot/feasibility study is to establish the relatedness and nature of the yeast protein homologs and to address initial questions into cellular requirements for their function in Golgi apparatus organization and membrane trafficking pathways.

Project Start
Project End
Budget Start
Budget End
Support Year
8
Fiscal Year
1993
Total Cost
Indirect Cost
Name
University of Colorado Denver
Department
Type
DUNS #
065391526
City
Aurora
State
CO
Country
United States
Zip Code
80045
Sokol, Ronald J; Mack, Cara; Narkewicz, Michael R et al. (2003) Pathogenesis and outcome of biliary atresia: current concepts. J Pediatr Gastroenterol Nutr 37:4-21
Sokol, R J; Straka, M S; Dahl, R et al. (2001) Role of oxidant stress in the permeability transition induced in rat hepatic mitochondria by hydrophobic bile acids. Pediatr Res 49:519-31
Leslie, K K; Reznikov, L; Simon, F R et al. (2000) Estrogens in intrahepatic cholestasis of pregnancy. Obstet Gynecol 95:372-6
Simon, F R; Fortune, J; Iwahashi, M et al. (1999) Characterization of the mechanisms involved in the gender differences in hepatic taurocholate uptake. Am J Physiol 276:G556-65
Ostrowska, A; Karrer, F M; Bilir, B M (1999) Histological identification of purified and cryopreserved allogeneic hepatocytes following transplantation in a murine model without host immunosuppression. Transpl Int 12:188-94
Martin, S L; Maniero, G D; Carey, C et al. (1999) Reversible depression of oxygen consumption in isolated liver mitochondria during hibernation. Physiol Biochem Zool 72:255-64
Shivaram, K N; Winklhofer-Roob, B M; Straka, M S et al. (1998) The effect of idebenone, a coenzyme Q analogue, on hydrophobic bile acid toxicity to isolated rat hepatocytes and hepatic mitochondria. Free Radic Biol Med 25:480-92
Sokol, R J; McKim Jr, J M; Goff, M C et al. (1998) Vitamin E reduces oxidant injury to mitochondria and the hepatotoxicity of taurochenodeoxycholic acid in the rat. Gastroenterology 114:164-74
Podolin, D A; Sutherland, E; Iwahashi, M et al. (1998) A high-sucrose diet alters the lipid composition and fluidity of liver sinusoidal membranes. Horm Metab Res 30:195-9
Sokol, R J; Devereaux, M W; Khandwala, R (1998) Effect of oxypurinol, a xanthine oxidase inhibitor, on hepatic injury in the bile duct-ligated rat. Pediatr Res 44:397-401

Showing the most recent 10 out of 94 publications