alexa Peer Reviewed Journals In Endocrine Disorders | OMICS International | Human Genetics And Embryology

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Endocrine Disorders

Estrogen (E2) and thyroid hormones (THs) regulate cell migration, differentiation, proliferation and synaptogenesis during cerebellar development. These events involve the binding of hormone ligands to their cognate receptors to activate relevant genes for the adequate orchestration of developmental processes. Recent reports implicate a complex mechanism through which E2 and THs influence the expression levels of each other’s receptors (ERs and TRs). In addition, an growing body of evidence suggests that endocrine disruptors (EDs) influence hormone-regulated physiological events. Here we examined the effects of the presence or absence of E2, THs and three EDs (bisphenol A, arsenic and zearalenone) on the expression levels of ER and TR receptor mRNAs and proteins in cerebellar granule cell cultures. Receptor expression levels were determined by quantitative PCR and Western blot techniques. Results were compared to non-treated controls and to samples obtained from age-matched in situ cerebella. Additionally, we determined the effects that glial cells might have on the regulation of ER-TR expression levels. Results show that: (i) ER and TR expression levels depend on the individual, as well as combined presence of E2 and THs; (ii) glial cells are important mediators in the hormonal regulation of neuronal ER-TR expression, and (iii) EDs have characteristic, nevertheless distinct effects on ER-TR expression levels. These observations suggest that both E2 and THs, in adequate amounts, are required for the precise orchestration of cerebellar development and that interactions between endogenous and exogenous hormon-like signals may influence cerebellar development in a manner more complex than previously thought.
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Last date updated on September, 2020