Czernichow P, Reynaud K, Kerr-Conte J, Furthner E, Ravassard P. Production, Characterization, and Function of Pseudoislets from Perinatal Canine Pancreas.
Cell Transplant 2019;
28:1641-1651. [PMID:
31450972 PMCID:
PMC6923560 DOI:
10.1177/0963689719869004]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
We evaluated the cell composition and function of canine pancreatic pseudoislets (PIs)
produced from 42- to 55-day-old fetuses, 1- to 21-day-old pups, and an adult dog pancreas.
After mild collagenase treatment, partially digested tissues were cultured for 2–3 weeks.
PI production started on culture day 3, was marked for 6 to 9 days, and then stopped. PI
production was greatest with the neonatal specimens, reaching about 12 million aggregates
per litter (55-day-old fetus) or per pancreas (1-day-old pup). Cell composition at all
stages was similar to that in adult pancreatic islets, with predominant β cells, scant α
cells and, most importantly, presence of δ cells. Among pancreatic markers assessed by
quantitative real-time PCR (qRT-PCR) mRNA assay, insulin showed the highest expression
levels in PIs from newborn and adult pancreas, although these were more than 1000 times
lower than in adult islets. Pdx1 mRNA expression was high in PIs from 55-day-old
pancreases and was lower at later stages. Consistent with the qRT-PCR results, the insulin
content was far lower than reported in adult dog pancreatic islets. However, insulin
release by PIs from 1-day-old pups was demonstrated and was stimulated by a high-glucose
medium. PIs were transplanted into euglycemic and diabetic SCID mice. In euglycemic
animals, the transplant cell composition underwent maturation and transplants were still
viable after 6 months. In diabetic mice, the PI transplants produced insulin and partially
controlled the hyperglycemia. These data indicate that PIs can be produced ex vivo from
canine fetal or postnatal pancreases. Although functional PIs can be obtained, the
production yield is most likely insufficient to meet the requirements for diabetic dog
transplantation without further innovation in cell culture amplification.
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