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Myeloproliferative sarcoma virus (MPSV), a new tool for the study of hematopoiesis
Abstract:
MPSV induces a myeloproliferative syndrome in susceptible mice associated with an invasion of hematopoietic and nonhematopoietic organs with tumor nodules. The effect of the virus on the various hematopoietic precursors (CFU-S, CFU-C, CFU-E, BFU-E) was studied in vivo in the spleen, blood, and bone marrow, and in vitro, using colony assays in semisolid medium. After in vivo and in vitro infection MPSV induces the appearance of CFU-C, independent of added colony-stimulating activity and of pure and mixed BFU-E, independent of burst-promoting activity. MPSV also induces in vivo an amplification of the size and concentration of the hematopoietic system, including hematopoietic stem cells. MPSV infection may also alter the hemapoietic microenvironment. Modification of the disease by total body irradiation followed by bone marrow stem cell reconstitution or by splenectomy is compatible with mediation of the virus effect at the level of hematopoietic microenvironment. MPSV may constitute a new tool to study the regulation of murine hematopoiesis and viral genetic information, which can specifically induce characteristic disturbances of this system.
Insights
Murine polyomavirus (MPSV) causes myeloproliferative syndrome in mice, affecting hematopoietic precursors and organs. This virus offers a new tool for studying hematopoiesis regulation and viral disturbances.
Area of Science:
- Virology
- Hematology
- Oncology
Background:
- Murine polyomavirus (MPSV) induces a myeloproliferative syndrome in susceptible mice.
- This syndrome involves tumor nodule invasion in hematopoietic and non-hematopoietic organs.
Purpose of the Study:
- To investigate the effect of MPSV on various hematopoietic precursors (CFU-S, CFU-C, CFU-E, BFU-E) in vivo and in vitro.
- To explore MPSV's potential role in altering the hematopoietic microenvironment.
Main Methods:
- In vivo and in vitro studies using spleen, blood, and bone marrow.
- Colony assays in semisolid medium to assess hematopoietic precursor activity.
- Modification of disease by irradiation/bone marrow reconstitution and splenectomy.
Main Results:
- MPSV infection led to the appearance of CFU-C and BFU-E, independent of external growth factors.
- In vivo, MPSV amplified the hematopoietic system, including hematopoietic stem cells.
- Evidence suggests MPSV alters the hematopoietic microenvironment, as disease modification was observed after irradiation/reconstitution and splenectomy.
Conclusions:
- MPSV induces specific disturbances in murine hematopoiesis.
- MPSV represents a novel tool for studying hematopoiesis regulation and viral pathogenesis.
- The virus's effect may be mediated at the level of the hematopoietic microenvironment.