Abstract
To evaluate whether the age-dependence of brain plasticity correlates with the levels of proteins involved in hormone and brain functions we executed a paired associative stimulation (PAS) protocol and blood tests. We measured the PAS-induced plasticity in the primary motor cortex. Blood levels of the brain-derived neurotrophic factor (BDNF), estradiol, the insulin-like growth factor (IGF)-1, the insulin-like growth factor binding protein (IGFBP)-3, progesterone, sex hormone-binding globulin (SHBG), testosterone, and the transforming growth factor beta 1 (TGF-β1) were determined in 15 healthy men and 20 healthy women. We observed an age-related reduction of PAS-induced plasticity in females that it is not present in males. In females, PAS-induced plasticity displayed a correlation with testosterone (p = 0.006) that became a trend after the adjustment for the age effect (p = 0.078). In males, IGF-1 showed a nominally significant correlation with the PAS-induced plasticity (p = 0.043). In conclusion, we observed that hormone blood levels (testosterone in females and IGF-1 in males) may be involved in the age-dependence of brain plasticity.
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Acknowledgments
This work was supported by: (1) PNR-CNR Aging Program 2012–2014; (2) Ministry of Health Cod. GR-2008-1138642 [ProSIA] and Grant no. RF 2003/38; (3) MIUR Prot. 2010SH7H3F ‘Functional connectivity and neuroplasticity in physiological and pathological aging [ConnAge]’. We thank all healthy volunteers for their time to participate to the study. We also thank Patrizio Pasqualetti for better defining the confidence limits of our study.
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Polimanti, R., Simonelli, I., Zappasodi, F. et al. Biological factors and age-dependence of primary motor cortex experimental plasticity. Neurol Sci 37, 211–218 (2016). https://doi.org/10.1007/s10072-015-2388-6
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DOI: https://doi.org/10.1007/s10072-015-2388-6