Abstract
The Habenula is increasingly being investigated in addiction. Reduced volumes of other relevant brain regions in addiction, such as nucleus accumbens, globus pallidus and hypothalamus have been reported. Reduced volumes of the habenula as well as reduced neuronal cell count in the habenula have also been reported in mood disorders and an overlap between mood disorders and addiction is clinically widely recognized. Thus, our aim was to investigate possible volume and neuronal cell count differences in heroin addicts compared to healthy controls. Volumes of the medial (MHB) and lateral habenula (LHB) in heroin addicts (n = 12) and healthy controls (n = 12) were assessed by morphometry of 20 µm serial whole brain sections. Total brain volume was larger in the heroin group (mean 1466.6 ± 58.5 cm3 vs. mean 1331.5 ± 98.8 cm3), possibly because the heroin group was about 15 years younger (p = 0.001). Despite larger mean whole brain volume, the mean relative volume of the MHB was smaller than in healthy non-addicted controls (6.94 ± 2.38 × 10–6 vs.10.64 ± 3.22 × 10−6; p = 0.004). A similar finding was observed regarding relative volumes of the LHB (46.62 ± 10.90 × 10−6 vs. 63.05 ± 16.42 × 10−6 p = 0.009). In parallel, neuronal cell numbers were reduced in the MHB of heroin-addicted subjects (395,966 ± 184,178 vs. 644,149 ± 131,140; p < 0.001). These findings were not significantly confounded by age and duration of autolysis. Our results provide further evidence for brain-structural deficits in heroin addiction.
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Acknowledgements
The Magdeburg Brain Collection and subsequently this investigation have been supported in part by the Stanley Medical Research Foundation (Grant No. 07R-1832) to BB and JS, the Saxony-Anhalt Ministry of Research (XN3594O/0405M, N2-OVGU), the German Ministry of Research („BrainNet“, BMBF NBL-3/2 and 01ZZ0407) and the Alfried-Krupp-von-Bohlen-und-Halbach foundation. We are grateful to KB, BJ and GM-L for their excellent technical assistance.
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Müller, U.J., Ahrens, M., Vasilevska, V. et al. Reduced habenular volumes and neuron numbers in male heroin addicts: a post-mortem study. Eur Arch Psychiatry Clin Neurosci 271, 835–845 (2021). https://doi.org/10.1007/s00406-020-01195-y
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DOI: https://doi.org/10.1007/s00406-020-01195-y