title: Erythrocyte-replaced mouse model for Haemoparasite studies: comparison of NOD/shi-scid and C.B-17/Jcl-scid mouse upon acceptability of human erythrocytes.
abstract: The erythrocyte-exchanged chimera mouse model has become to be a significant tool for studying animal and human (hu) protozoan haemoparasites, though the usefulness of this model varies depending primarily on the acceptability of xenogeneic red blood cells (RBC). To find a superior recipient in comparison with C.B-17/Jcl mouse with severe combined immuno-deficiency (scid) mutation, we examined in this report the non-obese diabetes (NOD)/shi-scid mouse, a recently available strain of SCID. When 2.5 x 10(8) of fluorescent dye-labeled hu-RBCs were transfused, C.B-17scid mouse eliminated them logarithmically by a simple linear regression, while NOD-scid mouse eradicated hu-RBCs by a unique two-step fashion, i.e., a potent but only briefly functioning RBC eradication followed by a weak steadily functioning step. The means of regression line constance +/- their standard deviations (SD) of 205 C.B-17scid and of 213 NOD-scid mice for their short- and long-lasting steps were -0.73 +/- 0.63, -0.53 +/- 0.25 and -0.16 +/- 0.10, respectively. Hu-RBC half-lives determined from these means of C.B-17scid mice and of NOD-scid mice for the short- and long-living steps were 3.6, 4.9 and 16.3 hr, respectively. Higher hu-RBC acceptability of NOD-scid mouse, especially at their long-lasting step, was also demonstrated under at an activated state of mouse innate immunity. Treatment with 1.0 mg heat-killed Candida cells caused an acceleration of hu-RBC elimination in both mouse strains but the magnitudes for the short- and long-living steps of NOD-scid mice evaluated by "stimulation index" were only 1/2.6 and 1/7.6 of C.B-17scid mice, respectively.
authors.affiliation: School of Veterinary Medicine, Rakuno Gakuen University, Buankyo-dai, Ebetsu, Japan.
authors.forename: Chiaki
authors.initials: C
authors.lastname: Ishihara
authors.forename: Aya
authors.initials: A
authors.lastname: Zamoto
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Tsuji
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wei
authors.forename: Ichiro
authors.initials: I
authors.lastname: Azuma
authors.forename: Kyoji
authors.initials: K
authors.lastname: Hioki
mesh_terms: D000818:Animals; D017707:Erythrocyte Transfusion / Q000379:methods* / Q000662:veterinary; D006085:Graft Survival; D006801:Humans; D051379:Mice; D016688:Mice, Inbred NOD; D008815:Mice, Inbred Strains; D016513:Mice, SCID; D023421:Models, Animal; D011528:Protozoan Infections / Q000097:blood*; D013045:Species Specificity; D018183:Transplantation Chimera; D014183:Transplantation, Heterologous / Q000502:physiology*