Considering a renal origin of endocrine hypertension in ASIC1a‐deficient mice

I read with great interest the recent study by García et al. (2026), which links acid sensing ion channel 1a (ASIC1a) to a unique, age-related form of endocrine hypertension in male mice. Their work proposes a framework that connects ASIC1a, the hypothalamic–pituitary–adrenal (HPA) axis, aldosterone and blood pressure, providing a valuable perspective on how sex differences shape hypertensive pathology (García et al., 2026). The core mechanism proposed by García et al. (2026) is highly intriguing. They describe endocrine hypertension that resembles a chronic stress state and appears independent of the classical renin–angiotensin–aldosterone system (RAAS). However, although acknowledging the contribution of central ASIC1a, I suggest that the progression of the pathology may be driven, at least in part, by persistent signals arising from the periphery. This alternative perspective, initiated by a primary peripheral imbalance, may offer a more parsimonious explanation for several key physiological features in this model. Framing ASIC1a in this way preserves the integrative nature of their paradigm at the same time as rearranging the causal hierarchy. Central stress circuitry would then be viewed as an amplifier and interpreter of a chronic peripheral signal, rather than the sole initiator of endocrine dysfunction. My central point is that the stress-related signature in the hypothalamus may represent a downstream consequence of a systemic homeostatic disturbance, rather than its sole origin. An alternative hypothesis can be centred on a primary renal defect. García et al. (2026) report an early phenotype in male Asic1a−/− mice at 6 months of age: although normotensive, these animals already display hypokalaemia and reduced urine osmolality. This pattern suggests a mild but persistent impairment in renal ion handling. Longitudinal measurements of potassium balance, fractional excretion of electrolytes and early tubular stress markers in young Asic1a−/− mice could therefore be particularly informative. A shift in these indices preceding sustained increases in aldosterone or blood pressure would strongly favour a renal initiating event. If ASIC1a is expressed in renal tubular segments that participate in potassium secretion, its absence could directly alter tubular transport function. Given that chronic hypokalaemia is a potent non-RAAS stimulus for aldosterone secretion (Polenus et al., 2025), I speculate that the age-dependent progression to hypertension may arise from a long-standing renal tendency to lose potassium. This sequence, in which a renal electrolyte imbalance precedes adrenal remodelling and cardiovascular injury, conceptually resembles aspects of certain clinical forms of primary aldosteronism. This kidney centred perspective may also better account for the apparently paradoxical pattern in the reported HPA axis data. García et al. (2026) conclude that the HPA axis is functionally activated, yet their measurements show elevated plasma corticosterone with relatively stable upstream corticotropin-releasing hormone (CRH) and adrenocorticotropic hormone (ACTH) levels. This combination of downstream activation and upstream quiescence is difficult to attribute solely to a primary central driver without invoking additional assumptions. By contrast, it is consistent with compensatory adaptations to a chronic peripheral stimulus. One possible scenario is that sustained stimulation of the adrenal cortex could lead to hyperplasia or functional sensitization of steroidogenic cells. In such a context, steroid output would increase for a given ACTH signal, in line with classic descriptions of adrenal adaptation, and upstream hormones could remain within their reference range via mild negative feedback. This framework also yields concrete experimental predictions. For example, interventions that normalize potassium handling or blunt adrenal responsiveness should not only lower blood pressure, but also partially reverse the HPA axis profile, whereas selective central manipulation in the continued presence of a peripheral potassium defect might be expected to produce a less complete correction. Finally, this perspective offers a direct physiological basis for the striking sexual dimorphism. Although sex-dependent regulation of HPA axis feedback is undoubtedly a factor, a primary renal mechanism provides a foundational layer of explanation. Recent work emphasizes that sex differences in renal sodium handling contribute to divergent blood pressure trajectories (Drury et al., 2024). Moreover, the protective effects of oestrogen on tubular ion transport, potentially by modulating the expression or activity of sodium transport pathways such as the epithelial sodium channel (ENaC), could counteract a potassium wasting tendency (Harvey & Alvarez de la Rosa, 2025) and prevent the initial trigger for the pathological cascade. This offers a straightforward explanation for the protection observed in females and complements, rather than excludes, potential sex differences at the hypothalamic level. As García et al. (2026) note, definitive evaluation will require further experimental evidence. In conclusion, a hypothesis centred on a primary renal defect offers a unified and parsimonious framework for the model's early phenotype, age-related progression, HPA axis characteristics and pronounced sex differences. This ordering of events is experimentally testable by resolving the time course of renal, adrenal and hypothalamic changes. The work by García et al. (2026) has opened an exciting avenue for research. My intention is to stimulate further discussion on the critical site of ASIC1a action in this complex pathology. I look forward to future studies to delineate the causal sequence between central and peripheral events more clearly. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. No competing interests declared. Yanyu Zhang is the sole author. No funding was received.