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Measurements of Active TGFβ Generated by Culture Cells

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Part of the book series: Methods in Molecular Biology™ ((MIMB,volume 142))

Abstract

The transforming growth factors-β (TGF-βs) constitute a family of potent regulators of cellular differentiation, proliferation, migration, and protein expression (1,2). Three isoforms of TGF-β have been described in mammals: TGF-β1, 2, and 3 (35). Most cell lines and tissues secrete TGF-β as a large latent complex formed by three components: TGF-β, LAP (latency-associated protein), and LTBP (latent TGF-β binding proteins). TGF-β is noncovalently associated to its prodomain LAP (68), and LAP is disulfide-bonded to LTBP (9). Four LTBPs (LTBP-1, 2, 3, and 4) have been described (1014). Mature TGF-β must be released from the complex to bind to its high-affinity receptor and elicit its biological functions (15). This process, called TGF-β activation, appears to be a critical step in the control of TGF-β activity (16). An additional regulatory step involved in the activation process is the LTBP-mediated incorporation of latent TGF-β into the extracellular matrix (2). Activation of latent TGF-β has been described in various cell systems (1719). However, the molecular mechanisms involved in extracellular TGF-β activation are not fully understood. It also remains to be elucidated whether latent TGF-β incorporation into the extracellular matrix regulates TGF-β activation in a positive or negative manner (2).

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© 2000 Humana Press Inc.

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Mazzieri, R., Munger, J.S., Rifkin, D.B. (2000). Measurements of Active TGFβ Generated by Culture Cells. In: Howe, P.H. (eds) Transforming Growth Factor-Beta Protocols. Methods in Molecular Biology™, vol 142. Humana Press. https://doi.org/10.1385/1-59259-053-5:13

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  • DOI: https://doi.org/10.1385/1-59259-053-5:13

  • Publisher Name: Humana Press

  • Print ISBN: 978-0-89603-646-8

  • Online ISBN: 978-1-59259-053-7

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