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Abnormal Proliferation02:23

Abnormal Proliferation

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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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Mismatch Repair01:20

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
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Related Experiment Video

Updated: Mar 25, 2026

Author Spotlight: Analyzing Bone Marrow Microenvironment in Murine Hematological Malignancies
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Molecular pathogenesis of MDS.

Hisamaru Hirai1

  • 1Graduate School of Medicine, University of Tokyo, Japan.

International Journal of Hematology
|November 15, 2002
PubMed
Summary

Myelodysplastic syndromes (MDS) are clonal stem cell disorders causing ineffective blood cell production and resistance to treatment. Genetic alterations in MDS disrupt cell growth and differentiation, contributing to leukemogenesis.

Area of Science:

  • Hematology
  • Oncology
  • Molecular Biology

Background:

  • Myelodysplastic syndromes (MDS) are clonal hematopoietic stem cell disorders.
  • MDS is characterized by ineffective hematopoiesis and high risk of transformation to acute myeloid leukemia.
  • Current therapies for MDS are often ineffective.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying MDS pathogenesis.
  • To identify genetic lesions and signal transduction pathway disruptions in MDS.
  • To explore the role of tumor suppressor genes in MDS development.

Main Methods:

  • Genomic analysis of chromosomal abnormalities in MDS.
  • Identification and analysis of genetic alterations in key signal transduction molecules.

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  • Study of transcription factors regulating hematopoietic stem cell proliferation and differentiation.

    • Main Results:

    • MDS involves genetic lesions, including deletions and translocations of specific chromosomes (5, 7, 11, 12, 13, 20).
    • Disruptions in signal transduction pathways involving growth factor receptors, RAS molecules, cell cycle regulators, and transcription factors are observed.
    • Transcription factors regulating hematopoietic stem cell proliferation and differentiation are notably altered.

    Conclusions:

    • MDS pathogenesis involves the accumulation of genetic lesions and disruption of critical signaling pathways.
    • Unidentified tumor suppressor genes likely play a significant role in MDS.
    • Further molecular dissection of MDS is crucial for understanding multistep leukemogenesis and developing effective therapies.