Plasma prolactin is higher in major depressive disorder and females, and associated with anxiety, hostility, somatization, psychotic symptoms and heart rate

Asmahan Elgellaie; Theresa Larkin; Jacqueline Kaelle; Jessica Mills; Susan Thomas

doi:10.1016/j.cpnec.2021.100049

Plasma prolactin is higher in major depressive disorder and females, and associated with anxiety, hostility, somatization, psychotic symptoms and heart rate

Compr Psychoneuroendocrinol. 2021 Mar 20:6:100049. doi: 10.1016/j.cpnec.2021.100049. eCollection 2021 May.

Authors

Asmahan Elgellaie^{1

2}, Theresa Larkin^{1

2}, Jacqueline Kaelle^{2

3}, Jessica Mills^{2

4}, Susan Thomas^{1

2}

Affiliations

¹ School of Medicine, Faculty of Science, Medicine and Health, University of Wollongong, NSW, 2522, Australia.
² Illawarra Health and Medical Research Institute, Wollongong, NSW, 2522, Australia.
³ Illawarra Community Mental Health, Wollongong, NSW, 2500, Australia.
⁴ School of Psychology, Faculty of the Arts, Social Sciences and Humanities, University of Wollongong, NSW, 2522, Australia.

Abstract

Background: Major Depressive Disorder (MDD) is linked to poor physical health including an increased risk of developing cardiometabolic disease (CMD), yet the underlying physiology of this relationship is not clear. One pathophysiological mechanism that may underlie this relationship is neuroendocrine dysregulation, including that of the hormone prolactin. Prolactin has a role in the regulation of stress, and it is linked to anxiety, hostility, and weight gain, which are all implicated in MDD and increased CMD risk. However, little research has examined plasma prolactin in association with psychological symptoms of MDD or biometric indices of CMD risk. Method: Plasma samples of 120 participants (n = 60 meeting DSM-5 criteria for MDD and n = 60 control; age and sex matched) were analysed to assess prolactin concentration. Biometric data (BMI, waist circumference, blood pressure and heart rate) were collected, and participants completed the Brief Symptom Inventory (BSI) and Depression Anxiety Stress Scale (DASS).

Results: Plasma prolactin was higher in participants with MDD versus controls (8.79 ± 5.16 ng/mL and 7.03 ± 4.78 ng/mL, respectively; F = 4.528, p = 0.035) and among females versus males (9.14 ± 5.57 ng/mL and 6.31 ± 3.70 ng/mL, respectively; F = 9.157, p = 0.003). Prolactin was correlated with several psychological symptoms including anxiety, hostility and somatization, and with heart rate, but not with any other biometric measures.

Conclusions: The results of this study indicate that neuroendocrine dysregulation in MDD may extend to the hormone prolactin, with prolactin being specifically associated with a subset of related psychometric and cardiovascular measures.

Keywords: Anxiety; Cardiometabolic disease; Hostility; Major depressive disorder; Prolactin.