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    Feedback inhibitors in normal and tumor tissues.

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    Authors
    Marshall, E
    Lord, Brian I
    Affiliation
    Department of Medical Oncology, Christie Hospital, NHS Trust, Manchester, United Kingdom.
    Issue Date
    1996
    
    Metadata
    Show full item record
    Abstract
    Negative feedback represents the principal mechanism for regulating growth in biological systems. Over the past 20 years, our understanding of the role played by inhibitory factors governing this process has advanced considerably. This is particularly well illustrated in the field of experimental hematology with the recognition of hemopoietic progenitor cell proliferation inhibitors, an expanding group of unrelated peptides that act to limit proliferation in hemopoietic precursor cells. The characterization and subsequent production of these molecules by chemical synthesis or recombinant DNA technology has enabled investigators to explore their role in normal hemopoiesis and define a potential role in clinical medicine. A number of inhibitory factors, including macrophage inflammatory protein-1 alpha (MIP-1 alpha) and the tetrapeptide AcSDKP appear to share a relative specificity to hemopoietic progenitor cell subsets. Others, such as interferon and tumor necrosis factor, have a more complex action and their hemopoietic effects are likely to be indirect and nonspecific. In addition to the role of inhibitors in normal steady state, it has become increasingly evident that loss of sensitivity to the normal feedback inhibitory signals may be of central importance in carcinogenesis and tumor promotion. This presumably represents a developmental strategy that allows the neoplastic cell to maintain a growth advantage over its normal cell counterpart. The underlying mechanisms that terminate in inhibitor-resistance are yet to be elucidated, but in some instances they may be associated with aberrant tumor suppressor gene function.
    Citation
    Feedback inhibitors in normal and tumor tissues. 1996, 167:185-261 Int. Rev. Cytol.
    Journal
    International Review of Cytology
    URI
    http://hdl.handle.net/10541/95650
    DOI
    10.1016/S0074-7696(08)61348-0
    PubMed ID
    8768495
    Type
    Article
    Language
    en
    ISSN
    0074-7696
    ae974a485f413a2113503eed53cd6c53
    10.1016/S0074-7696(08)61348-0
    Scopus Count
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    All Christie Publications
    All Paterson Institute for Cancer Research

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