Original Article

Annals of Hematology

, Volume 92, Issue 5, pp 595-604

First online:

Cytological characterization of murine bone marrow and spleen hematopoietic compartments for improved assessment of toxicity in preclinical gene marking models

  • Min YangAffiliated withInstitute of Experimental Hematology, OE6960, Hannover Medical School
  • , Guntram BüscheAffiliated withInstitute of Pathology, Hannover Medical School
  • , Arnold GanserAffiliated withDepartment of Hematology, Hemostasis, Oncology, and Stem Cell Transplantation, Hannover Medical School
  • , Zhixiong LiAffiliated withInstitute of Experimental Hematology, OE6960, Hannover Medical School Email author 

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Abstract

Gene therapy has proven its potential to cure diseases of the hematopoietic system, but potential adverse reactions related to insertional mutagenesis by integrating gene vectors and chromosomal instability in long-lived repopulating cells have emerged as a major limitation. Preclinical gene therapy in murine models is a powerful model for assessment of gene marking efficiency and adverse reactions. However, changes in the hematologic composition after transplantation with retrovirally modified hematopoietic stem cells have not been well investigated in large cohorts of animals by systematic cytological analyses. In the present study, cytological analyses of bone marrow and spleen were performed in a large cohort (n = 58) of C57BL/6J mice over an extended observation period after gene marking. Interestingly, we observed hematological malignancies in four out of 30 animals transplanted with dLNGFR (truncated form of the human p75 low-affinity nerve growth factor receptor) and tCD34 modified stem/progenitor cells. Our data demonstrate that cytological analysis provides important information for diagnosis of hematological disorders and thus should be included in preclinical studies and performed in each investigated animal. Together with histological analysis, flow cytometric analysis, and other analyses, the quality and predictive value of preclinical gene therapy studies will be improved.

Keywords

Preclinical gene therapy studies Cytological analysis dLNGFR tCD34