Aryl hydrocarbon receptor: Its roles in physiology

Aryl hydrocarbon receptor (AHR) was first identified for its role in xenobiotic detoxification. Over the past two decades, research has expanded to reveal physiological ligands and broader functions in development and homeostasis. Prior studies established AHR’s involvement in transcriptional regulation and signaling. However, the full scope of its physiological roles remained unclear. Deficiencies in AHR expression have been linked to developmental issues, but the underlying mechanisms were not fully understood. This gap motivated researchers to investigate AHR’s functions across organ systems. No prior work had resolved its role in cardiovascular or nervous system development. This paper addresses those uncertainties by summarizing recent findings on AHR’s physiological contributions.

The purpose of this mini review is to summarize recent findings on the physiological roles of AHR. It focuses on its functions in normal development and homeostasis across multiple systems. The authors aim to clarify how AHR contributes to cardiovascular, gastrointestinal, integumentary, nervous, and immunomodulatory functions. This work addresses the lack of comprehensive understanding of AHR’s physiological roles. The review synthesizes evidence from recent studies to highlight AHR’s importance in these systems. It does not aim to propose new hypotheses but to consolidate existing knowledge. The motivation arises from the need to better understand AHR’s contributions to organ development and homeostasis. This effort supports broader research into developmental and physiological regulation.

The authors conducted a literature review to compile recent findings on AHR’s physiological roles. They focused on studies examining AHR’s functions in cardiovascular, gastrointestinal, integumentary, nervous, and immunomodulatory systems. The review approach included analyzing published data on AHR deficiency and its effects on signaling systems. The authors synthesized evidence from multiple sources to highlight key findings. They did not perform new experiments but summarized existing research. The review approach emphasizes recent advances in understanding AHR’s roles in development and homeostasis. The authors structured their findings around organ-specific contributions of AHR. This method allows for a comprehensive overview of AHR’s physiological functions.

Deficiency in AHR expression disrupts major signaling systems and transcriptional programs. This disruption leads to developmental abnormalities such as cardiac hypertrophy and epidermal hyperplasia. Recent studies show AHR’s involvement in cardiovascular development and function. The receptor also plays a role in gastrointestinal homeostasis and immune regulation. AHR contributes to integumentary system development and function. Its role in the nervous system includes regulation of signaling pathways. The receptor modulates immunomodulatory responses through transcriptional activity. These findings suggest AHR is a key player in multiple physiological systems.

The authors conclude that AHR functions in multiple physiological systems, including cardiovascular, gastrointestinal, integumentary, nervous, and immunomodulatory systems. Their synthesis of recent findings highlights AHR’s role in development and homeostasis. The review emphasizes the receptor’s importance in signaling and transcriptional regulation. Deficiency in AHR leads to developmental abnormalities, as observed in prior studies. The authors suggest that AHR’s roles extend beyond xenobiotic detoxification. They propose that AHR contributes to normal physiological processes in multiple organ systems. The findings support the need for further research into AHR’s functions. This work provides a foundation for understanding AHR’s broader physiological roles.