Orexin-A neural network integrates feeding regulation with obesity-anxiety comorbidity, highlighting OX1R/OX2R roles.
Background
The significant comorbidity between anxiety and obesity highlights a shared underlying neurobiological basis, where emotional dysregulation often impacts feeding behavior and metabolic health. Current understanding often examines discrete functions of the orexin system in isolation, either focusing on metabolic regulation or stress responses. This fragmented approach leaves a critical gap in establishing an integrative framework for understanding the complex emotional–metabolic interplay, particularly how distinct signals mediated by OX1R and OX2R interact under pathological conditions.
Study Design
This review paper systematically examines the existing literature on the orexin system to establish an integrative framework for understanding the neural network of Orexin-A in feeding regulation and obesity–anxiety comorbidity. The authors specifically aim to bridge the gap in knowledge regarding how the bidirectional regulatory properties of OX1R and OX2R interact synergistically or antagonistically in pathological states, moving beyond isolated physiological studies.
Results
Existing research confirms that the orexin system, particularly Orexin-A, strongly stimulates food intake and widely participates in regulating movement, arousal, and anti-anxiety responses. Dysfunction of this system is closely related to mental diseases such as depression, anxiety, and addiction. At the clinical level, gene polymorphisms of orexin receptors are associated with increased susceptibility to human obesity. > Serum and cerebrospinal fluid (CSF) Orexin-A levels show a significantly lower trend in individuals with high Body Mass Index (BMI), suggesting a potential link to metabolic dysregulation. These multi-dimensional physiological functions are consistent with the specific distribution of OX1R and OX2R in brain regions like the paraventricular nucleus (PVN) and dorsomedial nucleus (DMN), which are critical for food and emotion regulation.
Key Findings
- Orexin-A strongly stimulates food intake and regulates movement, arousal, and anti-anxiety responses.
- Dysfunction of the orexin system is linked to depression, anxiety, and addiction.
- Gene polymorphisms of orexin receptors are associated with increased susceptibility to human obesity.
- Serum and
CSFOrexin-A levels are lower in individuals with high BMI. OX1RandOX2Rare distributed in brain regions critical for food and emotion, likePVNandDMN.
Why It Matters
Understanding the integrated neural network of Orexin-A is crucial for developing more effective, holistic treatments for the prevalent obesity–anxiety comorbidity. By elucidating how OX1R and OX2R signals interact, this framework could inform novel therapeutic strategies that simultaneously target both metabolic and emotional dysregulation. This review highlights the need for interventions that consider the bidirectional nature of orexin signaling, potentially leading to more nuanced pharmacological approaches than current isolated treatments. It moves beyond single-pathway interventions, suggesting that future protocols might involve modulators that selectively or synergistically influence OX1R and OX2R activity to restore both metabolic and psychological balance.
orexin-a
obesity
anxiety
feeding-regulation
neurobiology
ox1r