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Second generation knockout sickle mice: the effect of HbF.
- Source :
-
Blood [Blood] 2001 Jan 15; Vol. 97 (2), pp. 410-8. - Publication Year :
- 2001
-
Abstract
- Sickle transgenic mice expressing exclusively human globins are desirable for studying pathophysiology and testing gene therapy strategies, but they must have significant pathology and show evidence of amelioration by antisickling hemoglobins. Mice were generated that expressed exclusively human sickle hemoglobin with 3 levels of HbF using their previously described sickle constructs (cointegrated human miniLCRalpha2 and miniLCRbeta(S) [PNAS 89:12150, 1992]), mouse alpha- and beta-globin-knockouts, and 3 different human gamma-transgenes. It was found that, at all 3 levels of HbF expression, these mice have balanced chain synthesis, nearly normal mean corpuscular hemoglobin, and, in some cases, F cells. Mice with the least adult HbF expression were the most severe. Progressive increase in HbF from less than 3% to 20% to 40% correlated with progressive increase in hematocrit (22% to 34% to 40%) and progressive decrease in reticulocyte count (from 60% to 30% to 13%). Urine concentrating ability was normalized at high HbF, and tissue damage detected by histopathology and organ weight were ameliorated by increased HbF. The gamma-transgene that produces intermediate levels of HbF was introduced into knockout sickle mice described by Pàszty and coworkers that express the miniLCRalpha1(G)gamma(A)gammadeltabeta(S) transgene and have fetal but not adult expression of HbF. It was found that the level of HbF required to ameliorate low hematocrit and normalize urine concentrating defect was different for the miniLCRalpha2beta(S) and miniLCRalpha1(G)gamma(A)gammadeltabeta(S) mice. We conclude that knockout mice with the miniLCRalpha2beta(S) transgene and postnatal expression of HbF have sufficiently faithful sickle pathology to serve as a platform for testing antisickling interventions.
- Subjects :
- 2,3-Diphosphoglycerate blood
Age Factors
Animals
Chromatography, High Pressure Liquid
Erythrocytes drug effects
Erythrocytes metabolism
Erythrocytes pathology
Fetal Hemoglobin pharmacology
Globins biosynthesis
Globins drug effects
Hematocrit
Hemoglobin, Sickle drug effects
Hemoglobin, Sickle genetics
Humans
Kidney drug effects
Kidney pathology
Kidney Concentrating Ability drug effects
Liver drug effects
Liver pathology
Mice
Mice, Inbred C57BL
Reticulocyte Count
Spleen drug effects
Spleen pathology
Thalassemia blood
Thalassemia metabolism
Thalassemia pathology
Anemia, Sickle Cell blood
Anemia, Sickle Cell metabolism
Anemia, Sickle Cell pathology
Disease Models, Animal
Mice, Knockout genetics
Mice, Transgenic genetics
Subjects
Details
- Language :
- English
- ISSN :
- 0006-4971
- Volume :
- 97
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Blood
- Publication Type :
- Academic Journal
- Accession number :
- 11154217
- Full Text :
- https://doi.org/10.1182/blood.v97.2.410