Summary
Most research on the pancreatic B cell has so far focussed on the regulation and molecular biology of insulin biosynthesis and release. The present review draws attention to some additional areas of islet research which have become accessible to investigation by recent methodological progress and which may advance our understanding of the role of the B cell in diabetes. There is now evidence to suggest that B cells arise from a pool of undifferentiated precursor cells in the fetal and newborn pancreas. These cells may contribute to islet growth and, if inappropriately stimulated, also to early islet hyperplasia. In the postnatal state, B-cell function is finely tuned by a complex set of incoming signals, one of which is the nutrient supply provided by the blood. Recent studies indicate that a disproportionately high fraction of pancreatic blood is diverted to the islets and that the islet blood flow is increased by glucose. An acute stimulus to insulin release may thus be accompanied by a process which enhances the distribution of the hormone to the target cells. Long-term adjustments of B-cell function are made by changes in B-cell number and total mass. Adaptive growth responses to an increased insulin demand occur in a number of hereditary diabetic syndromes in animals, but in some of these there is an inherited restriction on the capacity for B-cell proliferation leading to further deterioration of the glucose tolerance. Some evidence suggests that a similar mechanism may operate also in human non-insulin-dependent diabetes. A critical appraisal of this hypothesis requires, however, that human B cells should be tested for their growth characteristics. Studies of B-cell proliferation in experimental animals have shown that the B cell passes through the cell cycle at a relatively high rate but that the fraction of proliferating cells is low. Regulation of growth of the total B-cell mass seems to take place by changes in the number of B cells passing through the cell cycle rather than by changes in the rate of the cycle. The number of proliferating B cells also shows a marked decrease with age. It is at present uncertain to what extent these regulatory mechanisms apply also to the human B cell but it can be anticipated that further technical developments will elucidate this problem.
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The Claude Bernard Lecture 1983 of the European Association for The Study of Diabetes
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Hellerström, C. The life story of the pancreatic B cell. Diabetologia 26, 393–400 (1984). https://doi.org/10.1007/BF00262208
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DOI: https://doi.org/10.1007/BF00262208