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Evolution of blood cells.

E L Cooper

    Annales D'Immunologie
    |November 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    The evolution of blood cells began with primitive phagocytic cells and progressed to specialized types like erythrocytes and leukocytes in invertebrates. This evolutionary journey in invertebrates laid the groundwork for vertebrate blood cell differentiation.

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    Area of Science:

    • Evolutionary Biology
    • Hematology
    • Comparative Immunology

    Background:

    • The earliest blood cells, protohemocytes, were involved in phagocytosis and nutrition.
    • Primitive metazoans like sponges utilized phagocytic archeocytes.
    • Early multicellular organisms showed progressive differentiation of blood cell types.

    Purpose of the Study:

    • To trace the evolutionary history of blood cells from primitive forms to vertebrates.
    • To identify key stages in blood cell differentiation across different animal phyla.
    • To understand the origins of leukocyte and erythrocyte lineages.

    Main Methods:

    • Comparative analysis of blood cell types across diverse invertebrate phyla (Metazoa, Cnidaria, Annelida, Mollusca, Arthropoda, Echinodermata, Tunicata).

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  • Examination of the functional roles of blood cells, including phagocytosis, nutrition, oxygen transport, and immunity.
  • Tracing the potential evolutionary lineage of vertebrate blood cells from invertebrate ancestors.

    • Main Results:

    • Protohemocytes and archeocytes represent early phagocytic blood cells.
    • Annelids exhibit differentiated leukocytes resembling granulocytes, lymphocytes, and monocytes, along with cell-mediated immunity.
    • Erythrocytes evolved in certain annelids for oxygen transport.
    • Vertebrate blood cell differentiation, involving bone marrow and lymphoid organs, may have evolved from deuterostome invertebrates like tunicates and echinoderms.

    Conclusions:

    • Blood cell evolution shows a clear progression from simple phagocytic cells to complex, specialized types.
    • Invertebrate blood cell diversity and immune functions provide a foundation for vertebrate hematopoiesis.
    • The evolutionary pathway suggests a link between invertebrate and vertebrate blood cell systems, particularly through deuterostome lineages.