title: Islet architecture: A comparative study.
abstract: Emerging reports on the organization of the different hormone-secreting cell types (alpha, glucagon; beta, insulin; and delta, somatostatin) in human islets have emphasized the distinct differences between human and mouse islets, raising questions about the relevance of studies of mouse islets to human islet physiology. Here, we examine the differences and similarities between the architecture of human and mouse islets. We studied islets from various mouse models including ob/ob and db/db and pregnant mice. We also examined the islets of monkeys, pigs, rabbits and birds for further comparisons. Despite differences in overall body and pancreas size as well as total beta-cell mass among these species, the distribution of their islet sizes closely overlaps, except in the bird pancreas in which the delta-cell population predominates (both in singlets and clusters) along with a small number of islets. Markedly large islets (>10,000 mum(2)) were observed in human and monkey islets as well as in islets from ob/ob and pregnant mice. The fraction of alpha-, beta- and delta-cells within an islet varied between islets in all the species examined. Furthermore, there was variability in the distribution of alpha- and delta-cells within the same species. In summary, human and mouse islets share common architectural features that may reflect demand for insulin. Comparative studies of islet architecture may lead to a better understanding of islet development and function.
authors.affiliation: Department of Medicine, The University of Chicago, Chicago, IL, USA.
authors.forename: Abraham
authors.initials: A
authors.lastname: Kim
authors.forename: Kevin
authors.initials: K
authors.lastname: Miller
authors.forename: Junghyo
authors.initials: J
authors.lastname: Jo
authors.forename: German
authors.initials: G
authors.lastname: Kilimnik
authors.forename: Pawel
authors.initials: P
authors.lastname: Wojcik
authors.forename: Manami
authors.initials: M
authors.lastname: Hara
mesh_terms: D000328:Adult; D000818:Animals; D001717:Birds; D005260:Female; D005934:Glucagon / Q000378:metabolism; D000882:Haplorhini; D006801:Humans; D007328:Insulin / Q000378:metabolism; D050417:Insulin-Secreting Cells / Q000166:cytology / Q000378:metabolism; D007515:Islets of Langerhans / Q000033:anatomy & histology* / Q000166:cytology* / Q000196:embryology; D051379:Mice; D008810:Mice, Inbred C57BL; D008820:Mice, Obese; D011247:Pregnancy; D011817:Rabbits; D013004:Somatostatin / Q000378:metabolism; D019864:Somatostatin-Secreting Cells / Q000166:cytology / Q000378:metabolism; D013552:Swine
chemical_list: D007328:Insulin; D013004:Somatostatin; D005934:Glucagon