Amyloid-enhancing factor: production and response in amyloidosis-susceptible and -resistant mouse strains.
Genetic variations in the development of casein-induced amyloidosis exist among inbred strains of mice: CBA/J and C57BL/6J mice are susceptible, while A/J strain mice are resistant to this disease. Amyloidosis is usually induced by daily injections of an inflammatory stimulus for 2-3 wk. The deposition of amyloid in experimental animals can be accelerated by injection of a material called amyloid-enhancing factor (AEF); when injected concomitantly with an inflammatory stimulus, AEF provokes appearance of amyloidosis as early as 2 days after injection. AEF is extracted from amyloid laden or from normal organs (although in small amount). Our studies were designed to determine if the resistance to amyloidosis seen in A/J mice was either due to a lack of AEF production or to an inability of these mice to respond to AEF. A standard source of CBA/J-derived AEF facilitated the development of amyloidosis in the organs of both the susceptible (CBA/J, C57BL/6J) and the resistant A/J mice. On the contrary, amyloidosis was only induced in susceptible CBA/J hosts when material derived from susceptible (CBA/J, C57BL/6J) animals was injected. CBA/J mice injected with A/J-derived AEF preparation did not develop amyloidosis. These results thus suggest that the determination of resistance or susceptibility to secondary amyloidosis could operate at the level of AEF production.
Gervais
F
F
Montreal General Hospital Research Institute, Canada.
Hébert
L
L
Skamene
E
E
D000686:Amyloidosis / Q000378:metabolism*; D000818:Animals; D006023:Glycoproteins / Q000378:metabolism*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains / Q000502:physiology*; D011499:Protein Processing, Post-Translational; D000685:Serum Amyloid A Protein / Q000378:metabolism*
D006023:Glycoproteins; D000685:Serum Amyloid A Protein; C046748:amyloid enhancing factor