ESTABLISHMENT OF A MODEL OF TRANSPLANTABLE MYELOCYTIC LEUKEMIA (L_(801)) IN LACA MICE

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A transplantable myelocytic leukemia model of LACA mice, designated by the name of L_(801), was established by intravenous injection of spleen cell suspension from mice with radiation-induced myclocytic leukemia into mice of the same strain.Until now, for more than three years, the L_(801) has maintained stable and rapid growth and has been reproduced for over 130 serial passages. The incidence of leukemia in inoculated animals was approximately 100% and mean survival time was 10.9±2.1 days. The L_(801) is of myelocytic type which has been determined by cytological, cytochemical, pathological and ultrastructural observations. Its karyotype was hypodiploid, characterized by modal number of 39, loss of Y chromosome and an abnormal huge marker chromosome. The cell cycle duration of the L_(801) was 16 h. C-type viral particles were observed under the electron-microscope. The L_(801) was sensitive, to varying extents, to various anti-tumor agents.We presume that the L_(801) is a useful tool in studies on me A transplantable myelocytic leukemia model of LACA mice, designated by the name of L_ (801), was established by intravenous injection of spleen cell suspension from mice with radiation-induced myclocytic leukemia into mice of the same strain. Now now, for more than three years, the L_ (801) has maintained stable and rapid growth and has been reproduced for over 130 serial passages. The incidence of leukemia in inoculated animals was approximately 100% and mean survival time was 10.9 ± 2.1 days. The L_ (801) is of myelocytic type which has been determined by cytological, cytochemical, pathological and ultrastructural observations. Its karyotype was hypodiploid, characterized by modal number of 39, loss of Y chromosome and an abnormal huge marker chromosome. The cell cycle duration of the L_ (801) was 16 h. C-type viral particles were observed under the electron-microscope. The L_ (801) was sensitive, to varying extents, to various anti-tumor agents. We presume that the L_ (801) is a useful too l in studies on me
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