Genetic and epigenetic modulation of AHR pathway in GH-secreting pituitary tumors and effects on acromegaly clinical phenotype.

Introduction: Several data demonstrated that chemical pollutants can be endocrine disruptors and they have an important role in tumorigenic processes. It has been shown that pollution exposure can affect pituitary cells' function and biology, indeed an increased prevalence of acromegaly has been reported in highly polluted areas.

Evidence acquisition: One transcription factor that has a role in both carcinogenesis and in xenobiotics' detoxification is the aryl hydrocarbon receptor (AHR). Its deregulation could have a pivotal role in pituitary tumors, especially in GH-secreting pituitary tumors. Environmental chemicals affect the expression and function of ncRNAs (miRNA, lncRNA and circRNA) through different mechanisms.

Evidence synthesis: However, to date, few data on the role of the environmental pollutants in the clinical expression and pathogenesis of GH-secreting pituitary tumors are available.

Conclusions: This article presents a summary of the AHR signaling pathways that are triggered by various ligands and emphasizes the significant distinctions between the potential biological and toxicological effects of AHR gene activation. We also deepen the functions of ncRNAs and acromegaly and provide current data on their regulation by the AHR. Overall, more studies are still needed to fully understand the dynamic interplay between the AHR signaling pathway and ncRNAs in GH-secreting pituitary adenomas.