The Journal of Clinical Investigation · 5 authors, 2 centres
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This anatomical study used large-scale imaging to examine the relationship between pancreatic islets and blood vessels across multiple species, finding that arterioles feed the pancreas regionally rather than targeting individual islets, which challenges the traditional unidirectional blood flow model.
The study investigated the spatial relationship between pancreatic islets and blood vessels in human, monkey, pig, rabbit, ferret, and mouse tissues using large-scale image capture. The authors found that while some arterioles contacted islets, the majority of islets had no association with them. Islets with direct arteriole contact were significantly larger and fewer in number. The findings suggest arterioles feed the pancreas regionally, not targeting individual islets, with capillaries branching directly from arterioles. This challenges the 1932 model of unidirectional blood flow from islets to exocrine tissue. The authors propose this regional vascularization allows simultaneous exposure of downstream islets and acinar cells to circulating factors. Limitations include the need for in vivo studies in large animals to confirm dynamic blood flow. The work provides a new anatomical framework for understanding integrated pancreatic pathophysiology.
