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Polypeptide growth factors: some structural and mechanistic considerations
Journal of Supramolecular Structure
|January 1, 1980
Summary
Polypeptide growth factors are crucial for cell growth and development. Grouping them with secondary hormones highlights their similar functions, including cell maintenance and gene modulation.
Area of Science:
- Cell Biology
- Endocrinology
- Developmental Biology
Background:
- Polypeptide growth factors stimulate cell proliferation and survival during embryonic development and tissue maintenance in adults.
- Their precise relationship with other cellular regulators is not fully understood.
- Emerging evidence suggests growth factors exhibit hormone-like properties, proposing their classification as secondary hormones.
Purpose of the Study:
- To explore the functional similarities between polypeptide growth factors and endocrine agents.
- To propose a broader classification of "secondary hormones" encompassing growth factors.
- To investigate the role of growth factor internalization in cellular processes.
Main Methods:
- Literature review and conceptual analysis of growth factor functions.
- Comparison of growth factor activities with known endocrine agents, using the insulin-related family as an example.
- Review of studies on nerve growth factor and epidermal growth factor internalization.
Main Results:
- Growth factors share functional similarities with hormones, including trophic stimulation and gene expression modulation.
- Internalization of growth factors is a common feature, though its precise role is debated.
- The proposed "secondary hormone" classification aids in understanding their broader biological significance.
Conclusions:
- Polypeptide growth factors can be functionally grouped with endocrine agents as secondary hormones.
- Internalization of growth factors may mediate intracellular actions or regulate cell surface responsiveness and degradation.
- Further research is needed to elucidate the exact mechanisms and functions of growth factor endocytosis.
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