Cortisol Reactivity to Stress and Its Association With White Matter Integrity in Adults With Schizophrenia.

Abstract

OBJECTIVES Although acute hypothalamic-pituitary-adrenal axis response to stress is often adaptive, prolonged responses may have detrimental effects. Many components of white matter structures are sensitive to prolonged cortisol exposure. We aimed to identify a behavioral laboratory assay for cortisol response related to brain pathophysiology in schizophrenia. We hypothesized that an abnormally prolonged cortisol response to stress may be linked to abnormal white matter integrity in patients with schizophrenia. METHODS Acute and prolonged salivary cortisol response was measured outside the scanner at pretest and then at 0, 20, and 40 minutes after a psychological stress task in patients with schizophrenia (n = 45) and controls (n = 53). Tract-averaged white matter was measured by 64-direction diffusion tensor imaging in a subset of patients (n = 30) and controls (n = 33). RESULTS Patients who did not tolerate the psychological stress task and quit had greater acute (t = 2.52 [p = .016] and t = 3.51 [p = .001] at 0 and 20 minutes) and prolonged (t = 3.62 [p = .001] at 40 minutes) cortisol reactivity compared with patients who finished the task. Abnormally prolonged cortisol reactivity in patients was significantly associated with reduced white matter integrity (r = -0.468, p = .009). Regardless of task completion status, acute cortisol response was not related to the white matter measures in patients or controls. CONCLUSIONS This paradigm was successful at identifying a subset of patients whose cortisol response was associated with brain pathophysiology. Abnormal cortisol response may adversely affect white matter integrity, partly explaining this pathology observed in schizophrenia. Prolonged stress responses may be targeted for intervention to test for protective effects against white matter damages.

DOI: 10.1097/PSY.0000000000000215
0204020162017
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@article{Nugent2015CortisolRT, title={Cortisol Reactivity to Stress and Its Association With White Matter Integrity in Adults With Schizophrenia.}, author={Katie L. Nugent and Joshua J Chiappelli and Hemalatha Sampath and Laura Rowland and Kavita Thangavelu and Beshaun J. Davis and Xiaoming Du and Florian Muellerklein and Stacey B Daughters and Peter V. Kochunov and L. Elliot Hong}, journal={Psychosomatic medicine}, year={2015}, volume={77 7}, pages={733-42} }