Reframing stress adaptation as a dynamic system failure along a threat-response continuum: towards a phase-specific, mechanism-driven framework

The meticulous study by Lv et al. [1] provides a critical advance by standardizing chronic restraint stress (CRS) protocols, revealing a temporal progression from behavioral avoidance to despair in male mice. While the authors framed this progression as modeling a transition from “anxiety” to “depression,” we propose a mechanistic conceptualization: the observed behaviors may represent three distinct phases of decompensation within a unified, allostatically regulated threat-response continuum. This reframing moves beyond descriptive comorbidity to offer a testable, phase-specific framework aligned with the NIMH Research Domain Criteria (RDoC), thereby bridging preclinical circuit mapping with translational hypothesis generation [2].

Lv et al.’s data capture a system under mounting strain rather than the sequential emergence of two discrete disorders. We reconceptualize their findings as a continuum of defensive system failure, where each phase is defined by a distinct computational goal and circuit configuration. Importantly, the temporal boundaries of each phase were selected to align with the most robust and behaviorally dissociated phenotypes reported by Lv et al.: 3-day CRS (6 h/day) for isolated avoidance and stereotypy; 10-day CRS (2 h/day) for the first emergence of anhedonia amid residual avoidance; and 14-day CRS (2 h/day) for consolidated coping failure and anhedonia.

Crucially, this continuum is reconstructed across distinct CRS protocols and independent cohorts, varying in stress intensity and duration. These cross-sectional comparisons do not establish within-subject temporal progression, and the precise boundaries between phases remain to be defined in longitudinal studies. This is a preview of subscription content, access via your institution Receive 12 print issues and online access Prices may be subject to local taxes which are calculated during checkout This commentary discusses previously published data by Lv et al. (Mol Psychiatry 2026;31(8):4576-4588).

No new datasets were generated in the present study. Lv Z, Xie Q, Li K, Fan Z, Cui Y, Dong Y. Standardized chronic restraint stress protocols reveal dynamic evolution of behavioral adaptations in male mice: implications for translational neuroscience.

Mol Psychiatry. 2026;31:4576–88. The NIMH Research Domain Criteria (RDoC) Project: precision medicine for psychiatry. Am J Psychiatry. 2014;171:395–7.

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