Experimental Transplantation With Principal Islets of Teleost Fish (Brockmann Bodies): Long-Term Function of Tilapia Islet Tissue in Diabetic Nude Mice

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Abstract
Certain teleost fish have macroscopically visible islets called BBs that are anatomically discrete. BBs were harvested from Oreochromis nilotica (tilapia) with microscissors, divided, and cultured overnight at 37°C before transplantation into STZ-induced diabetic nude mice. Each mouse received BB fragments from 3-5 fish weighing in aggregate ∼1.7 kg. Non-FPGs were monitored 5 days/wk. Recipients remained normoglycemic (plasma glucose 22.2 mM. Histological examination of graft-bearing kidneys showed viable, vascularized islet tissue containing numerous well-granulated β-cells; examination of recipient native pancreases revealed small islets composed predominately of non-β-cells.

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