IGF-1 as a Biomarker for Symptom Severity in Adult Traumatic Brain Injury: Evidence from an Observational Study
Traumatic brain injury (TBI)-related growth hormone deficiency is often undertreated, despite documented physical, metabolic, and neuropsychiatric effects. Insulin-like growth factor (IGF-1), with neuroreceptors located in brain regions responsible for learning, memory, and mood, regulates cerebral...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Mary Ann Liebert
2025-01-01
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| Series: | Neurotrauma Reports |
| Subjects: | |
| Online Access: | https://www.liebertpub.com/doi/10.1089/neur.2025.0009 |
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| Summary: | Traumatic brain injury (TBI)-related growth hormone deficiency is often undertreated, despite documented physical, metabolic, and neuropsychiatric effects. Insulin-like growth factor (IGF-1), with neuroreceptors located in brain regions responsible for learning, memory, and mood, regulates cerebral blood flow, neurogenesis, and neuroplasticity. The aim of this study was to determine associations between IGF-1 levels and post-TBI symptom severity, anxiety, and depression. This retrospective observational study at an Academic Brain Injury Center included participants evaluated 3–12 months post-TBI with available IGF-1 values and complete Rivermead Post-Concussion Symptoms Questionnaire (RPQ-13), Generalized Anxiety Disorder-7 (GAD-7), and Patient Health Questionnaire-9 (PHQ-9) responses. Patients under 18 or over 65 and those with incomplete data were excluded. Participants were grouped by TBI severity: mild (Glasgow Coma Scale [GCS] 13–15) and moderate-to-severe (GCS < 13). IGF-1 Z-scores were standardized for age and gender. Significant negative correlations were found between IGF-1 levels and RPQ-13, GAD-7, and PHQ-9 scores across all TBI severity groups, with lower IGF-1 Z-scores correlating with higher symptoms of TBI, depression, and anxiety. The Generalized Linear Models showed that the IGF-1 Z-score is a significant predictor for GAD-7, PHQ-9, and RPQ-13. Specifically, a one-point increase in the IGF-1 Z-score is associated with a 29.85% decrease in anxiety symptoms on the GAD-7, a 16.30% reduction in depression severity on the PHQ-9, and a 39.23% decrease in post-TBI symptom severity on the RPQ-13. Findings suggest that decreased IGF-1 is associated with increased post-injury symptom severity, depression, and anxiety. Future studies should explore IGF-1 as a biomarker for TBI symptom severity. |
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| ISSN: | 2689-288X |