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FGF1 is highly expressed in neurons and it has been proposed to play a role in the neuroprotection and in regeneration. Low FGF1 expression in neurons has been linked to increased vulnerability in cholinergic neurons. Previous reports have shown that the expression of FGF1 in rat brain is localized to the cholinergic nuclei of the medulla oblongata, with low ratio of neurons positive for FGF1 in the dorsal motor nucleus of the vagus (DMNV). The role of FGF1 in the primate brain has yet to be clarified. In this study, we mapped FGF1 immunoreactivity in the medulla oblongata of cynomolgus monkey brainstems. Our results demonstrated that FGF1 immunoreactivity follows the pattern of distribution of cholinergic nuclei in the medulla oblongata; with strong localization of FGF1 to cholinergic neurons of the hypoglossal nucleus, the facial nucleus and the nucleus ambiguus. In contrast, the DMNV shows markedly lower FGF1 immunoreactivity. Localization of FGF1 to cholinergic neurons was only observed in the lateral region of the DMNV, with higher immunoreactivity in the rostral ventral-lateral region of the DMNV. These findings are consistent with the distribution of FGF1 immunoreactivity in previous studies of the rat brain.

Mapping of FGF1 in the Medulla Oblongata of <i>Macaca fascicularis</i>