Abstract
Long-term glucocorticoid medication is indispensable for controlling inflammatory, autoimmune, allergic, neurologic and oncologic diseases, yet its cumulative toxicity resembles accelerated biological aging. We develop the concept that systemic glucocorticoids can cause iatrogenic aging by activating the acyl-CoA binding protein/diazepam-binding inhibitor (ACBP/DBI)-gamma-aminobutyric acid type A (GABAA) receptor axis. ACBP/DBI has emerged as a circulating biomarker of biological aging and age-related diseases in human cohorts, and as a driver of pathological aging in rodent models. Extracellular ACBP/DBI acts on a subset of GABAA receptors containing the gamma-2 subunit, overlapping with the benzodiazepine-sensitive receptor system. Epidemiological associations between chronic benzodiazepine exposure and dementia, cancer, cardiovascular events, infections and immune dysfunction therefore provide a pharmacological parallel to persistent ACBP/DBI signaling. Among endocrine stimuli, glucocorticoids are the strongest inducers of ACBP/DBI expression and secretion. Glucocorticoid receptor activation stimulates hepatocyte-derived ACBP/DBI release, converting endocrine stress into ACBP/DBI-mediated systemic autophagy inhibition, metabolic dysfunction and immunosuppression. In mice, genetic deletion, antibody-mediated neutralization or receptor-level interruption of ACBP/DBI signaling attenuates multiple features of glucocorticoid excess, including obesity, diabetes, dyslipidemia, sarcopenia, osteoporosis and impaired anticancer immunity. In sharp contrast, ACBP/DBI neutralization does not interfere with the anti-inflammatory action of glucocorticoids. Clinically, chronic endogenous or exogenous glucocorticoid exposure is associated with metabolic syndrome, unfavorable body-composition changes, osteoporosis, sarcopenia, cardiovascular disease, neurocognitive decline and infection susceptibility. In this Perspective, we propose that protracted systemic glucocorticoid therapy represents a paradigmatic form of iatrogenic aging that activates a stress-endocrine ACBP/DBI-GABAA receptor program. In practice, we strongly recommend avoiding chronic, high-dose glucocorticoid medications, whenever possible.
Keywords
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