Experimental murine hyalohyphomycosis with soil-derived isolates of Fusarium solani.
Two strains of soil-borne Fusarium solani, both characterized for their ability to produce cyclosporin A and C, were examined for their pathogenicity in severe combined immunodeficiency (SCID) and BALB/c male mice. Intravenous (i.v.) infections with F. solani conidia were performed. No mortality was observed after infection with 0.3-1.6 x 10(7) cfu per mouse in SCID and BALB/c mice. When mice were infected with 0.8-1.5 x 10(6) cfu per mouse and 2 days later with 1.2-1.9 x 10(6) cfu per mouse, 28.6-85.7% survival occurred over a 25-day period, depending on the F. solani strain and the inbred mouse line used. Death was preceded by renal insufficiency affecting both kidneys. Furthermore, i.v. injection with heat-killed conidia followed 2 days later by injecting viable conidia resulted in renal infection in both breeds of mice. F. solani isolated from infected organs was more virulent than the original isolate, and 3/8 (37.5%) of BALB/c and 4/7 (57.1%) of SCID mice died after receiving a single dose. Dissemination to the brain was found only in SCID mice, but torticollis was observed in both mouse breeds. Soil-borne F. solani isolates possess poor pathogenic potential for mice, but either two successive infective doses or a primary injection with heat-killed conidia followed by a single infective dose breaks through host defenses in normal and immunoincompetent mice. Mouse passage increased the pathogenicity of two soil-derived F. solani strains.
Sugiura
Y
Y
Department of Food Chemistry, Kobe Institute of Health, Kobe, Japan. kih-info-1@mse.biglobe.ne.jp
Sugita-Konishi
Y
Y
Kumagai
S
S
Reiss
E
E
D000818:Animals; D015169:Colony Count, Microbial; D016572:Cyclosporine / Q000378:metabolism; D003524:Cyclosporins / Q000096:biosynthesis; D004195:Disease Models, Animal; D005670:Fusarium / Q000302:isolation & purification / Q000472:pathogenicity*; D007275:Injections, Intravenous; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D016513:Mice, SCID; D009181:Mycoses / Q000382:microbiology* / Q000473:pathology / Q000503:physiopathology; D051437:Renal Insufficiency; D012988:Soil Microbiology; D016019:Survival Analysis; D014774:Virulence
D003524:Cyclosporins; C100000:cyclosporin C; D016572:Cyclosporine