The Philadelphia chromosome in human macrophages

Area of Science:

• Hematology
• Oncology
• Cell Biology

Background:

• Chronic myelocytic leukemia (CML) is a myeloproliferative neoplasm.
• The Philadelphia chromosome (Ph1) is a hallmark genetic abnormality in CML.

Purpose of the Study:

• To investigate the presence of the Ph1 chromosome in macrophages from CML patients.
• To determine if the mononuclear phagocyte cell line is involved in Ph1-positive CML.

Main Methods:

• Bone marrow cells from three CML patients were cultured to promote macrophage proliferation.
• Cytogenetic and cytochemical analyses were performed on cultured cells.

Main Results:

• The Ph1 chromosome was detected in over 80% of identifiable macrophages.
• All examined metaphases from these macrophages contained the Ph1 chromosome.

Conclusions:

• The mononuclear phagocyte cell line harbors the abnormal Ph1 chromosome in Ph1-positive CML.
• Macrophages are involved in the pathogenesis of Ph1-positive chronic myelocytic leukemia.