Insulin-like growth factors: Ligands, binding proteins, and receptors

Derek LeRoith, Jeff M.P. Holly, Briony E. Forbes

    Research output: Contribution to journalReview articlepeer-review

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    Abstract

    Background: The insulin-like growth factor family of ligands (IGF-I, IGF-II, and insulin), receptors (IGF-IR, M6P/IGF-IIR, and insulin receptor [IR]), and IGF-binding proteins (IGFBP-1-6) play critical roles in normal human physiology and disease states. Scope of review: Insulin and insulin receptors are the focus of other chapters in this series and will therefore not be discussed further. Here we review the basic components of the IGF system, their role in normal physiology and in critical pathology's. While this review concentrates on the role of IGFs in human physiology, animal models have been essential in providing understanding of the IGF system, and its regulation, and are briefly described. Major conclusions: IGF-I has effects via the circulation and locally within tissues to regulate cellular growth, differentiation, and survival, thereby controlling overall body growth. IGF-II levels are highest prenatally when it has important effects on growth. In adults, IGF-II plays important tissue-specific roles, including the maintenance of stem cell populations. Although the IGF-IR is closely related to the IR it has distinct physiological roles both on the cell surface and in the nucleus. The M6P/IGF-IIR, in contrast, is distinct and acts as a scavenger by mediating internalization and degradation of IGF-II. The IGFBPs bind IGF-I and IGF-II in the circulation to prolong their half-lives and modulate tissue access, thereby controlling IGF function. IGFBPs also have IGF ligand-independent cell effects.

    Original languageEnglish
    Article number101245
    Number of pages16
    JournalMolecular Metabolism
    Early online date4 May 2021
    DOIs
    Publication statusE-pub ahead of print - 4 May 2021

    Keywords

    • Cancer
    • Growth
    • Insulin-like growth factor binding proteins
    • Insulin-like growth factor receptors
    • Insulin-like growth factors
    • Metabolism

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