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A possible role of estrogens in carcinogenesis of non-target tissues
Abstract:
The mitogenic action of the estrogen-receptor complex is supposedly similar in both normal and malignant target tissues. As receptors are present in several types of non-target tissues, in the case of lesions at the nuclear acceptor sites, the complex in those might be able to cause successive mitoses. Estrogen-dependent tumors of non-target tissues have been reported by several investigators. In normal and malignant cells of the breast and some other types of non-endocrine cells, the ability to produce their own estrogens (from circulating precursors) has been shown. The locally formed estrogens might have a role in the initiation of some malignant transformations. Indications of this process are the switching to estrogen production of some neoplastic endocrine or undifferentiated cells, certain ectopic effects displayed by some cancerous tissues, and the possible roles of GH, PRL and cholesterol in the development of some malignancies. The present endocrine system for the synthesis of the sexual hormones might be a specialization of a system at the cellular level. Polypeptide hormones might evolve from regulatory parts of cyclases or phosphodiesterases. Traces of the original biological processes might still be maintained by several cell-types.
Insights
Estrogen-receptor complexes may drive cell division in non-target tissues, potentially initiating cancer. Local estrogen production in cells like breast cells could play a role in malignant transformations.
Area of Science:
- Endocrinology
- Molecular Biology
- Oncology
Background:
- Estrogen-receptor complexes are known to stimulate cell division (mitogenesis) in normal and malignant target tissues.
- Receptors in non-target tissues, if affected at nuclear sites, could also trigger cell proliferation.
- Estrogen production by non-endocrine cells, such as breast cells, has been observed.
Purpose of the Study:
- To explore the potential role of estrogen-receptor complexes in causing mitoses in non-target tissues.
- To investigate the implications of local estrogen synthesis in the initiation of malignant transformations.
- To examine the evolutionary origins of hormone synthesis and cellular regulatory systems.
Main Methods:
- Review of existing literature on estrogen action, receptor function, and tumor development.
- Analysis of reported cases of estrogen-dependent tumors in non-target tissues.
- Consideration of cellular mechanisms for estrogen synthesis and hormonal regulation.
Main Results:
- Estrogen-dependent tumors have been reported in non-target tissues.
- Normal and malignant non-endocrine cells can synthesize their own estrogens from precursors.
- Local estrogen formation may contribute to the initiation of some malignancies.
Conclusions:
- The mitogenic action of estrogen-receptor complexes might extend to non-target tissues, potentially initiating tumors.
- Endogenous estrogen production within cells could be a factor in malignant transformation.
- The current endocrine system may represent a specialization of more primitive cellular regulatory systems.