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Eur J Neurosci. 2019 Apr 16. doi: 10.1111/ejn.14420. [Epub ahead of print]

Cross sex hormone treatment is linked with a reversal of cerebral patterns associated with gender dysphoria to the baseline of cisgender controls.

Author information

1
Center for Neurobiology of Stress and Resilience, Department of Medicine, Division of Digestive Diseases, University of California, Los Angeles, California, USA.
2
Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
3
ANOVA, Center of Expertise in Andrology, Sexual Medicine, and Transgender Medicine, Karolinska University Hospital, Stockholm, Sweden.
4
Department of Medicine/Huddinge, Karolinska Institutet, Stockholm, Sweden.
5
Department of Women's and Children's Health, Karolinska Institutet and University Hospital, Stockholm, Sweden.
6
Department of Neurology, University of California Los Angeles, Los Angeles, California, USA.

Abstract

Transgender persons experience incongruence between their gender identity and birth-assigned sex. The resulting gender dysphoria (GD), is frequently treated with cross-sex hormones. However, very little is known about how this treatment affects the brain of individuals with GD, nor do we know the neurobiology of GD. We recently suggested that disconnection of fronto-parietal networks involved in own-body self-referential processing could be a plausible mechanism, and that the anatomical correlate could be a thickening of the mesial prefrontal and precuneus cortex, which is unrelated to sex. Here, we investigate how cross-sex hormone treatment affects cerebral tissue in persons with GD, and how potential changes are related to self-body perception. Longitudinal MRI measurements of cortical thickness (Cth) were carried out in 40 transgender men (TrM), 24 transgender women (TrW) and 19 controls. Cth increased in the mesial temporal and insular cortices with testosterone treatment in TrM, whereas anti-androgen and oestrogen treatment in TrW caused widespread cortical thinning. However, after correction for treatment-related changes in total grey and white matter volumes (increase with testosterone; decrease with anti-androgen and oestrogen), significant Cth decreases were observed in the mesial prefrontal and parietal cortices, in both TrM and TrW (vs. controls) - regions showing greater pre-treatment Cth than in controls. The own body - self congruence ratings increased with treatment, and correlated with a left parietal cortical thinning. These data confirm our hypothesis that GD may be associated with specific anatomical features in own-body/self-processing circuits that reverse to the pattern of cisgender controls after cross-sex hormone treatment.

KEYWORDS:

brain; cortical thickness; oestrogen; testosterone; transgender

PMID:
30991464
DOI:
10.1111/ejn.14420

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