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Chronic B cell malignancies and bone marrow microenvironment
Paolo Ghia1, Luisa Granziero, Marco Chilosi
1Department of Biomedical Sciences and Human Oncology, University of Torino, Italy.
Seminars in Cancer Biology
|May 25, 2002
Summary
Chronic B-cell leukemias like follicular lymphoma (FL) and chronic lymphocytic leukemia (CLL) import supportive cells into the bone marrow (BM). Multiple myeloma (MM) alters the existing BM microenvironment for its growth.
Area of Science:
- Hematology
- Cancer Biology
- Immunology
Background:
- Chronic B-lymphoid malignancies, including follicular lymphoma (FL), chronic lymphocytic leukemia (CLL), and multiple myeloma (MM), rely on specific microenvironments for survival and growth.
- These malignancies accumulate in the bone marrow (BM), interacting with bystander cells that provide crucial survival and growth signals.
- Significant differences exist in how these distinct B-cell malignancies engage with and utilize their microenvironments.
Purpose of the Study:
- To elucidate the distinct mechanisms by which FL, CLL, and MM interact with the bone marrow (BM) microenvironment.
- To propose a model explaining how FL and CLL cells establish a supportive microenvironment in the BM.
- To contrast this with the mechanism employed by MM cells to exploit the BM niche.
Main Methods:
- Comparative analysis of cellular interactions between malignant B-cells (FL, CLL, MM) and bone marrow (BM) microenvironmental components.
- Review and synthesis of existing literature on B-cell malignancy tropism for specific niches.
- Development of a conceptual model based on observed differences in microenvironmental engagement.
Main Results:
- Follicular lymphoma (FL) and chronic lymphocytic leukemia (CLL) cells appear to 'import' normal cells from secondary lymphoid organs into the bone marrow (BM) to recreate a nurturing microenvironment.
- Multiple myeloma (MM) cells, conversely, do not import cells but instead 'instruct' and abnormally activate the existing BM microenvironment to support their proliferation.
- These findings highlight divergent strategies employed by distinct B-cell malignancies to harness supportive niches.
Conclusions:
- FL and CLL exhibit an 'outsourcing' strategy, bringing their preferred microenvironment to the bone marrow.
- MM employs an 'insourcing' strategy, manipulating the native bone marrow environment.
- Understanding these distinct microenvironmental interactions is crucial for developing targeted therapies for B-cell malignancies.