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Brain-derived neurotrophic factor in higher vertebrate pancreas: immunolocalization in glucagon cells

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Abstract

Brain-derived neurotrophic factor (BDNF) is a growth factor that belongs to the group of neurotrophins. Its amino acid sequences are well conserved during vertebrate phylogenesis. Pancreatic tissue has recently been reported to be one of the physiological sources of BDNF in humans and mice. In this study we investigated the presence and localization of BDNF immunoreactivity (IR) in the pancreas of three species of higher vertebrates: mouse, duck and lizard. BDNF IR was present in the islets and in single cells scattered in the exocrine parenchyma of all three species examined. Using double staining, BDNF IR was seen to be colocalized with glucagon IR in all the species studied. There was a total overlap of BDNF and glucagon IR in duck and lizard pancreas, and partial overlap in mouse pancreas. Our findings suggest that, as well as the primary structure, the presence and pattern of distribution of BDNF in higher vertebrates is also well conserved. Moreover, the abundance of BDNF IR in the pancreas of the species studied leads us to the suggestion that these neurotrophins could regulate the function of pancreatic innervation and/or act on pancreatic cells in a paracrine/autocrine fashion.

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Acknowledgement

We thank Mrs. Annamaria Zollo for her excellent technical assistance.

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Correspondence to C. Lucini.

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Lucini, C., Maruccio, L., de Girolamo, P. et al. Brain-derived neurotrophic factor in higher vertebrate pancreas: immunolocalization in glucagon cells. Anat Embryol 206, 311–318 (2003). https://doi.org/10.1007/s00429-002-0304-3

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