Cited by 104Pancreatic function and diabetesDiabetes and associated disordersConnexins and lens biology

Glucose Induces Opposite Intracellular Ca2+ Concentration Oscillatory Patterns in Identified α- and β-Cells Within Intact Human Islets of Langerhans

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Quesada, Ivan, Todorova, Mariana G., Alonso-Magdalena, Paloma, Beltrá, Marta, Carneiro, Everardo M., Martin, Franz, Nadal, Angel, Soria, Bernat·2006·Diabetes

Abstract

Homeostasis of blood glucose is mainly regulated by the coordinated secretion of glucagon and insulin from α- and β-cells within the islets of Langerhans. The release of both hormones is Ca2+ dependent. In the current study, we used confocal microscopy and immunocytochemistry to unequivocally characterize the glucose-induced Ca2+ signals in α- and β-cells within intact human islets. Extracellular glucose stimulation induced an opposite response in these two cell types. Although the intracellular Ca2+ concentration ([Ca2+]i) in β-cells remained stable at low glucose concentrations, α-cells exhibited an oscillatory [Ca2+]i response. Conversely, the elevation of extracellular glucose elicited an oscillatory [Ca2+]i pattern in β-cells but inhibited low-glucose–induced [Ca2+]i signals in α-cells. These Ca2+ signals were synchronic among β-cells grouped in clusters within the islet, although they were not coordinated among the whole β-cell population. The response of α-cells was totally asynchronic. Therefore, both the α- and β-cell populations within human islets did not work as a syncitium in response to glucose. A deeper knowledge of α- and β-cell behavior within intact human islets is important to better understand the physiology of the human endocrine pancreas and may be useful to select high-quality islets for transplantation.

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  • Glucose-induced [Ca2+]i oscillations are observed in human β-cells and are less well synchronised across human islets than mouse islets.

    “Although glucose-induced [Ca2+]i oscillations are observed in human β-cells, and are probably driven by oscillatory electrical activity (529) (Figure 6C), they are less well synchronised across human islets than mouse islets (102).”
  • Synchronous [Ca2+]i oscillations across the whole islet are not usually observed in human islets, although they have been reported for small groups of β-cells.

    “By contrast, synchronous [Ca2+]i oscillations across the whole islet are not usually observed in human islets (102), although they have been reported for small groups of β-cells (529).”

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Authors
Quesada, I., Todorova, M. G., Alonso-Magdalena, P., Beltrá, M., Carneiro, E. M., Martin, F., Nadal, A., & Soria, B.
Affiliations
  • Institute of Bioengineering, Miguel Hernandez University, Sant Joan d’Alacant, Spain
  • Universitat de Miguel Hernández d'Elx (ES)
  • Universidade Estadual de Campinas (UNICAMP) (BR)
  • Andalusian Center of Developmental Biology, University Pablo Olavide, Seville, Spain
  • Centro Andaluz de Biología Molecular y Medicina Regenerativa (ES)
Venue
Diabetes
Published
2006-09-01
Volume
55
Issue
9
Pages
2463-2469
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2159937109
Cited by
104
References
0
Citations by year
2026: 3 · 2025: 2 · 2024: 3 · 2023: 5 · 2022: 6 · 2021: 6 · 2020: 3 · 2019: 6 · 2018: 3 · 2017: 5 · 2016: 3 · 2015: 6 · 2014: 12 · 2013: 8 · 2012: 7
FWCI
5.78
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (acceptedVersion)
Funders
Instituto de Salud Carlos III (GO3/171, GO3/210, GO3/212)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Connexins and lens biology
Keywords
calcium oscillations, alpha cells, pancreatic beta cells, glucose stimulation, insulin secretion, glucagon secretion, calcium signaling, islet transplantation, pancreatic endocrine cells
MeSH terms
Adolescent, Adult, Calcium, Glucose, Humans, Immunohistochemistry, Microscopy, Confocal, Calcium Signaling, Glucagon-Secreting Cells, Insulin-Secreting Cells

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