| Version | Summary | Created by | Modification | Content Size | Created at | Operation |
|---|---|---|---|---|---|---|
| 1 | Maria L Perepechaeva | -- | 1757 | 2026-02-11 11:00:52 | | | |
| 2 | Catherine Yang | Meta information modification | 1757 | 2026-02-12 01:24:04 | | |
Pharmacological compounds can disrupt glucose homeostasis, leading to impaired glucose tolerance, hyperglycemia, or newly diagnosed diabetes, as well as worsening glycemic control in patients with pre-existing diabetes. Traditional risk factors alone cannot explain the rapidly growing global incidence of diabetes. Therefore, prevention of insulin resistance could represent an effective strategy. Achieving this goal requires a deeper understanding of the mechanisms underlying the development of insulin resistance, with particular attention to the aryl hydrocarbon receptor (AhR). AhR, a transcription factor functioning as a xenobiotic sensor, plays a key role in various molecular pathways regulating normal homeostasis, organogenesis, and immune function. Activated by a range of exogenous and endogenous ligands, AhR is involved in the regulation of glucose and lipid metabolism as well as insulin sensitivity. However, current findings remain contradictory regarding whether AhR activation exerts beneficial or detrimental effects. This narrative review summarizes recent studies exploring the role of the AhR pathway in insulin secretion and glucose homeostasis across different tissues, and discusses molecular mechanisms involved in this process. Considering that several drugs act as AhR ligands, the review also compares how these ligands affect metabolic pathways of glucose and lipid metabolism and insulin sensitivity, producing either positive or negative effects.
The use of pharmacological agents can easily disrupt the balanced function of the dynamic and sensitive endocrine system. Drugs may induce endocrine disorders through various mechanisms, including alterations in hormone production, changes in the regulation and feedback of associated molecular pathways, impairment of hormone transport, and related processes[1].
Drug-induced DM represents a serious problem in clinical practice, with a higher likelihood of development in individuals predisposed to glucose metabolism disorders due to genetic factors or unhealthy lifestyle habits, including overeating and excess body weight[2][3].
The factors contributing to the development of diabetes are well studied, but traditional risk factors cannot fully explain the rapid increase in the global prevalence of this disease. Therefore, additional factors, such as exposure to various xenobiotics, are being studied[4].
Obesity induced by environmental toxins, insulin resistance, and diabetes development are known to be mediated by the ligand-activated transcription factor aryl hydrocarbon receptor (AhR), which functions as a xenobiotic sensor[5][6][7].
AhR is a pleiotropic transcription factor that regulates the expression of numerous genes, which may exert distinct functions in different cell types and physiological conditions.
Glucose homeostasis is primarily controlled by the liver, adipose tissue, and skeletal muscle[8]. Excess glucose is stored in the body as glycogen (mainly in the liver and muscles), while, when necessary, glucose can be generated from non-carbohydrate substrates through gluconeogenesis[9][10]. The principal regulators of the balance between glucose utilization and synthesis are two hormones with opposing effects—insulin and glucagon[8].

Figure 1. Schematic diagram of some signal transduction pathways initiated by insulin (highly simplified in this Figure). Insulin binds to the α-subunit of insulin receptor, causing conformational changes that allow autophosphorylation of several tyrosine residues on the β-subunit. In the AKT signaling pathway, the phosphotyrosine-binding domains of adaptor proteins, such as members of the IRS family of insulin receptor substrates, recognize β-subunit residues of the insulin receptor, leading to phosphorylation of key tyrosine residues on IRS proteins. Activation of AKT requires PI3K, which induces phosphorylation of AKT. Once activated, AKT leads to phosphorylation and inactivation of GSK, which activates glycogen synthase. AKT also directly activates the transcription factors mTOR and Fork-head. AKT plays a significant role in the translocation of GLUT4 to the plasma membrane, resulting in glucose entry into the cell. AMPK is proposed to interact with insulin signaling and GLUT4 translocation. AKT, activates protein kinase B; GLUT, glucose transporter; GSK3, glycogen synthase kinase 3; IRS, members of the insulin receptor substrate family; mTOR, mammalian target of rapamycin; PI3K, protein kinase 3′-phosphoinositide-dependent protein kinase-1.
One of the manifestations of DM is impaired lipid metabolism: elevated lipid levels are common, affect cellular metabolism, and contribute to disease progression[11]. Dysregulated lipid metabolism combined with excessive caloric intake leads to obesity, the most prevalent metabolic disorder of the endocrine system[12]. The pathophysiology of metabolic diseases is highly complex. Triggers include insufficient glucose utilization due to insulin resistance, obesity, hypercortisolemia, or receptor-mediated inhibition of serine/threonine kinases such as AKT[13]. T2DM is one of these metabolic disorders[12].
Obesity induced by environmental toxins, insulin resistance, and diabetes development are mediated by the ligand-activated transcription factor (AhR), which functions as a xenobiotic sensor. Drug-induced disruption of glucose homeostasis may also involve AhR, for which drugs act as ligands[13][14].
AhR is a member of the basic helix-loop-helix Per-ARNT-Sim family of transcription factors. Members of this family are involved in gene expression networks that regulate numerous physiological and developmental processes, including responses to environmental signals[15][16][17][18].
AhR role in glucose metabolism is multifaceted and affects both metabolic processes and processes such as insulin secretion, glucose uptake, and overall glucose tolerance.
AhR plays a complex role in insulin resistance. Its involvement in the regulation of proinflammatory and metabolic processes can promote the development of insulin resistance and the progression of diabetes.
The effects of pharmaceutical agents on glucose metabolism with potential involvement of AhR are summarized in Table 1.
Table 1. Effect of pharmaceutical agents on glucose metabolism with potential AhR involvement.
|
Drugs |
Therapeutic Class |
Role in AhR Signaling |
Drug-Induced Metabolic Changes with Possible Involvement of AhR Signaling |
References |
|
Glucocorticoid |
Anti-inflammatory, immune- suppressant |
Cross-talk |
Development of hxyperglycemia, insulin resistance and type 2 diabetes. Destruction of pancreatic cells |
|
|
Clozapine |
Atypical antipsychotics |
Agonist |
Hyperglycemia and insulin resistance |
|
|
Omeprazole |
Proton pump inhibitor |
Agonist, non-classic ligand (non-classic AhR signaling) |
Insulin resistance. Increased risk of T2DM with long-term use, whereas potential improvement in glycemic control in diabetic patients receiving antidiabetic agents |
|
|
Propranolol |
β-blocker |
Agonist |
Development of hypoglycemia in patients with diabetes. Impaired glucose level recovery following hypoglycemia in diabetic patients by blocking adrenaline-stimulated glucose release |
|
|
Hydroxytamoxifen (Tamoxifen metabolite) |
Selective estrogen receptor modulator |
Agonist |
Impaired β-cell secretory activity. Enhancement of insulin resistance and exacerbation of the latent risk of diabetes in predisposed women |
|
|
Ttranilast |
Antiallergic |
Agonist |
Enhancement of glucose uptake by INS-1E cells and suppression of glucose-induced insulin secretion in INS-1E cells and rat pancreatic islets. |
|
|
Leflunomide |
Antirheumatic agent |
Agonist |
Enhancing insulin sensitivity and reducing hyperglycemia in diabetic mice fed a high-fat diet |
|
|
Flutamide |
Аntiandrogen |
Agonist, selective AhR modulator |
Reduced hyperinsulinemia in women with polycystic ovary syndrome but worsened glucose intolerance with high-fat diet in experimental animals |
|
|
Statins |
HMG-CoA reductase inhibitors |
Agonist |
Insulin resistance, increasing glucose production by upregulating enzymes involved in gluconeogenesis. Increased risk of developing T2DM in patients with obesity, worsening glycemic control in patients with T2DM |
There are several examples demonstrating how AhR involvement in the action of antidiabetic drugs reveals their novel therapeutic potential.
In this review, we summarize findings that highlight the role of AhR in drug-induced glucose metabolism dysregulation. Pharmacological compounds may alter glucose homeostasis through various mechanisms, including decreased insulin sensitivity via direct intracellular pathways, promotion of weight gain, and/or functional impairment of insulin secretion—potentially involving AhR.
This applies to certain existing drugs such as glucocorticoids and estrogens, which appear to directly or indirectly affect the AhR signaling pathway. Some medications known to induce glucose metabolism disorders act as AhR ligands. Experimental studies have shown that insulin resistance and glucose depletion may occur through AhR activation leading to AKT kinase–glucose pathway blockade (as in the case of the antipsychotic drug clozapine) or via AhR-mediated induction of proinflammatory signaling (as seen with the nonselective β-blocker propranolol). A more complex relationship is observed between DM and omeprazole, a proton pump inhibitor acting as a noncanonical AhR ligand. Omeprazole-induced AhR activation can help prevent diabetic retinopathy; however, long-term exposure may lead to metabolic alterations, including increased insulin and blood glucose levels. Tamoxifen, used in hormone therapy, can increase insulin resistance and exacerbate latent diabetes risk in predisposed women. Its active metabolite, 4-hydroxytamoxifen, binds to AhR and modulates its transcriptional activity. The metabolic effects of tamoxifen and its known role in insulin resistance suggest a potential link between AhR activation and tamoxifen-induced insulin resistance, although this connection remains to be fully elucidated. Statins such as atorvastatin and pravastatin may activate AhR and promote an AhR-dependent anti-inflammatory M2 macrophage phenotype. Based on these findings, AhR has been proposed as a novel target mediating the anti-inflammatory effects of statin therapy. However, the implications of AhR inhibitors or activators for DM risk and glycemic control in statin-treated patients require further investigation.
Conversely, some AhR ligands may prevent glucose metabolism dysregulation. The anti-allergic drug tranilast, a tryptophan derivative and AhR agonist, has shown potential in the treatment of diabetic complications—an area currently under investigation. The antirheumatic drug leflunomide, also an AhR agonist, demonstrates potential antidiabetic effects by enhancing insulin sensitivity and reducing hyperglycemia, likely mediated through its AhR-dependent anti-inflammatory properties. Another AhR agonist, flutamide, a nonsteroidal antiandrogen, has been shown to reduce hyperinsulinemia. The antidiabetic agent zopolrestat, containing a benzothiazole moiety, has been developed for treating diabetic complications. Benzothiazoles, a class of bicyclic heteroaromatic compounds, are known AhR ligands.
AhR antagonists are not widely studied in relation to glucose metabolism. Drug metformin and the flavonoid quercetin are AhR antagonists, both possessing antidiabetic properties. AhR antagonists should be explored as a potential therapeutic strategy in diabetes due to their ability to reduce inflammation, improve insulin sensitivity, and mitigate obesity-associated metabolic dysfunction[49][50][51]. As for metformin and quercetin, they exemplify how AhR involvement in their mechanisms of action unveils new therapeutic potential.
AhR activation can be both a primary driver of specific drug effects (especially toxic ones) and a minor contributing factor compared to other mechanisms for these drugs in the context of broader physiological processes, depending on the specific ligand, tissue, and biological context. It is not a single, universal mechanism for all drugs and AhR acts as a complex modulator among many other biological pathways. For pharmaceuticals, the effect of AhR activation is highly variable. Some new drugs, such as tapinarof for psoriasis, are designed to target AhR as their primary therapeutic mechanism for modulating the immune response[52][53][54][55]. For many other drugs, including those described in this review, AhR activation may be a secondary effect and a minor contributor to their overall action.
In conclusion, further studies are required to elucidate the complex interplay between AhR, insulin signaling, and glucose metabolism, and to clarify the precise mechanisms through which this interaction is mediated, as current research in this area is still ongoing.