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β-Adrenoceptor Blockade Moderates Neuroinflammation in Male and Female EAE Rats and Abrogates Sexual Dimorphisms in the Major Neuroinflammatory Pathways by Being More Efficient in Males

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Abstract

Our previous studies showed more severe experimental autoimmune encephalomyelitis (EAE) in male compared with female adult rats, and moderating effect of propranolol-induced β-adrenoceptor blockade on EAE in females, the effect associated with transcriptional stimulation of Nrf2/HO-1 axis in spinal cord microglia. This study examined putative sexual dimorphism in propranolol action on EAE severity. Propranolol treatment beginning from the onset of clinical EAE mitigated EAE severity in rats of both sexes, but to a greater extent in males exhibiting higher noradrenaline levels and myeloid cell β2-adrenoceptor expression in spinal cord. This correlated with more prominent stimulatory effects of propranolol not only on CX3CL1/CX3CR1/Nrf2/HO-1 cascade, but also on Stat3/Socs3 signaling axis in spinal cord microglia/myeloid cells (mirrored in the decreased Stat3 and the increased Socs3 expression) from male rats compared with their female counterparts. Propranolol diminished the frequency of activated cells among microglia, increased their phagocyting/endocyting capacity, and shifted cytokine secretory profile of microglia/blood-borne myeloid cells towards an anti-inflammatory/neuroprotective phenotype. Additionally, it downregulated the expression of chemokines (CCL2, CCL19/21) driving T-cell/monocyte trafficking into spinal cord. Consequently, in propranolol-treated rats fewer activated CD4+ T cells and IL-17+ T cells, including CD4+IL17+ cells coexpressing IFN-γ/GM-CSF, were recovered from spinal cord of propranolol-treated rats compared with sex-matched saline-injected controls. All the effects of propranolol were more prominent in males. The study as a whole disclosed that sexual dimorphism in multiple molecular mechanisms implicated in EAE development may be responsible for greater severity of EAE in male rats and sexually dimorphic action of substances affecting them.

Graphical Abstract

Propranolol moderated EAE severity more effectively in male rats, exhibiting greater spinal cord noradrenaline (NA) levels and myeloid cell β2-adrenoceptor (β2-AR) expression than females. Propranolol affected CX3CR1/Nrf2/HO-1 and Stat3/Socs3 signaling axes in myeloid cells, favored their anti-inflammatory/neuroprotective phenotype and, consequently, reduced Th cell reactivation and differentiation into highly pathogenic IL-17/IFN-γ/GM-CSF-producing cells.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

Not Applicable.

Funding

This study was funded by the Ministry of Education, Science and Technological Development of the Republic of Serbia (grant numbers 451–03-9/2021–14/200161, 451–03-68/2022–14/200177).

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Contributions

The study was conceived and designed by GL, IPi and IPr. All authors participated in the experiments, data analysis and/or interpretation. The manuscript draft was written by GL. All authors critically reviewed the manuscript and approved the final version.

Corresponding author

Correspondence to Gordana Leposavić.

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Conflict of Interest

The authors have no relevant financial or non-financial interests to disclose.

Ethical Approval

All experiments were carried out following the EU legislation on animal experimentation (Directive 2010/63/EU of the European Parliament and of the Council on the protection of animals used for scientific purposes). The study protocols were approved by the institutional Ethical Committee and Veterinary Directorate of the Ministry of Agriculture, Forestry and Water Economy of the Republic of Serbia (permit no. 323–07-01577/2016–05/14).

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Pilipović, I., Stojić-Vukanić, Z., Prijić, I. et al. β-Adrenoceptor Blockade Moderates Neuroinflammation in Male and Female EAE Rats and Abrogates Sexual Dimorphisms in the Major Neuroinflammatory Pathways by Being More Efficient in Males. Cell Mol Neurobiol 43, 1237–1265 (2023). https://doi.org/10.1007/s10571-022-01246-z

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  • DOI: https://doi.org/10.1007/s10571-022-01246-z

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