The overall objective is to define the natural history of spontaneous amyloidosis in hamsters and the cellular impairments of protein degradation that are common to age-associated amyloidoses. The aging golden Syrian hamster exhibits a striking gender difference in life span and in susceptibility to amyloid A (AA) fibril formation and deposition, with 100% incidence in female hamsters by 1.5 years, but only 25% in male hamsters at 3 years. In addition, female, but not male, hamsters have high concentrations of the amyloid P (AP) component analogue female protein (FP). Amyloidosis is the endpoint of a sequence of events in which SAA is transported by high density lipoprotein (HDL) through the bloodstream to peripheral tissues and incompletely degraded by mononuclear phagocytes, resulting in an exponential accumulation of AA fibrils in extracellular spaces. It is not known whether extracellular dissociation of apoSAA from HDL plays a critical role in amyloidosis, or whether SAA gene expression and AP secretion influence macrophage capacity for SAA proteolysis. It is postulated that there is a causal relationship between the pentraxin FP and impaired degradation of the AA fibril precursor serum amyloid A (SAA). Specifically, we will determine: 1) Whether the development of AA amyloidosis with aging is correlated with plasma FP concentrations a) in male and female amyloidosis-susceptible Syrian hamsters and amyloidosis- resistant Armenian hamsters b) in young and old hamsters in which amyloidosis is experimentally induced by dietary or subcutaneously injected casein; 2) Whether the degradation of SAA a) is restricted to cells of the mononuclear phagocyte series or occurs in cells of other lineages b) occurs intracellularly following uptake of SAA/HDL or apoSAA or c) is a function of the physicochemical form of SAA (SAA/HDL complex v. apoSAA) or the isotype structure of apoSAA; 3) Whether the capacity of mononuclear phagocytes to completely digest SAA is a) related to hamster strain, age and the concentration of FP in plasma b) affected by the FP or SAA gene expression c) directly or indirectly altered by FP. These studies will provide fundamental knowledge for logical therapeutic intervention in human amyloidosis and for enhancement of host defense with aging.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
1R01AG009006-01
Application #
3120814
Study Section
Biochemistry Study Section (BIO)
Project Start
1990-05-01
Project End
1994-04-30
Budget Start
1990-05-01
Budget End
1991-04-30
Support Year
1
Fiscal Year
1990
Total Cost
Indirect Cost
Name
Boston University
Department
Type
Schools of Medicine
DUNS #
604483045
City
Boston
State
MA
Country
United States
Zip Code
02118
Zhao, D; Letterman, J; Schreiber, B M (2001) beta-Migrating very low density lipoprotein (beta VLDL) activates smooth muscle cell mitogen-activated protein (MAP) kinase via G protein-coupled receptor-mediated transactivation of the epidermal growth factor (EGF) receptor: effect of MAP kinase activat J Biol Chem 276:30579-88
Chung, T F; Sipe, J D; McKee, A et al. (2000) Serum amyloid A in Alzheimer's disease brain is predominantly localized to myelin sheaths and axonal membrane. Amyloid 7:105-10
Schreiber, B M; Veverbrants, M; Fine, R E et al. (1999) Apolipoprotein serum amyloid A down-regulates smooth-muscle cell lipid biosynthesis. Biochem J 344 Pt 1:7-13
Elliott-Bryant, R; Cathcart, E S (1998) Amyloid enhancing factor and dietary transmission in accelerated amyloid A amyloidosis. Clin Immunol Immunopathol 88:65-9
Elliott-Bryant, R; Liang, J S; Sipe, J D et al. (1998) Catabolism of lipid-free recombinant apolipoprotein serum amyloid A by mouse macrophages in vitro results in removal of the amyloid fibril-forming amino terminus. Scand J Immunol 48:241-7
Gruys, E; Tooten, P C; Cathcart, E S (1998) Polyarthritis and periostitis induced by Escherichia coli. Lipopolysaccharide injection in young male hamsters. J Rheumatol 25:748-52
Hajri, T; Elliott-Bryant, R; Sipe, J D et al. (1998) The acute phase response in apolipoprotein A-1 knockout mice: apolipoprotein serum amyloid A and lipid distribution in plasma high density lipoproteins. Biochim Biophys Acta 1394:209-18
Liang, J; Elliott-Bryant, R; Hajri, T et al. (1998) A unique amyloidogenic apolipoprotein serum amyloid A (apoSAA) isoform expressed by the amyloid resistant CE/J mouse strain exhibits higher affinity for macrophages than apoSAA1 and apoSAA2 expressed by amyloid susceptible CBA/J mice. Biochim Biophys Acta 1394:121-6
Elliott-Bryant, R; Cathcart, E S (1997) Apolipoprotein E and apolipoprotein A-1 knock-out mice readily develop amyloid A protein amyloidosis. Clin Immunol Immunopathol 85:104-8
Liang, J S; Sloane, J A; Wells, J M et al. (1997) Evidence for local production of acute phase response apolipoprotein serum amyloid A in Alzheimer's disease brain. Neurosci Lett 225:73-6

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