| Title: | Glucose-dependent activation, activity, and deactivation of beta cell networks in acute mouse pancreas tissue slices |
|---|
| Authors: | ID Stožer, Andraž (Author)
ID Skelin, Maša (Author)
ID Gosak, Marko (Author)
ID Križančić Bombek, Lidija (Author)
ID Pohorec, Viljem (Author)
ID Rupnik, Marjan (Author)
ID Dolenšek, Jurij (Author) |
|---|
| Files: |  Stozer-2021-Glucose-dependent_activation,_acti.pdf (4,37 MB)
MD5: 1953BD452A93D2D0DEE8D5F986D2EAB8
 https://doi.org/10.1152/ajpendo.00043.2021
|
|---|
| Language: | English |
|---|
| Work type: | Scientific work |
|---|
| Typology: | 1.01 - Original Scientific Article |
|---|
| Organization: | MF - Faculty of Medicine
FNM - Faculty of Natural Sciences and Mathematics
|
|---|
| Abstract: | Many details of glucose-stimulated intracellular calcium changes in [beta] cells during activation, activity, and deactivation, as well as their concentration-dependence, remain to be analyzed. Classical physiological experiments indicated that in islets, functional differences between individual cells are largely attenuated, but recent findings suggest considerable intercellular heterogeneity, with some cells possibly coordinating the collective responses. To address the above with an emphasis on heterogeneity and describing the relations between classical physiological and functional network properties, we performed functional multicellular calcium imaging in mouse pancreas tissue slices over a wide range of glucose concentrations. During activation, delays to activation of cells and any-cell-to-first-responder delays are shortened, and the sizes of simultaneously responding clusters increased with increasing glucose concentrations. Exactly the opposite characterized deactivation. The frequency of fast calcium oscillations during activity increased with increasing glucose up to 12 mM glucose concentration, beyond which oscillation duration became longer, resulting in a homogenous increase in active time. In terms of functional connectivity, islets progressed from a very segregated network to a single large functional unit with increasing glucose concentration. A comparison between classical physiological and network parameters revealed that the first-responders during activation had longer active times during plateau and the most active cells during the plateau tended to deactivate later. Cells with the most functional connections tended to activate sooner, have longer active times, and deactivate later. Our findings provide a common ground for recent differing views on [beta] cell heterogeneity and an important baseline for future studies of stimulus-secretion and intercellular coupling.
NEW & NOTEWORTHY: We assessed concentration-dependence in coupled [beta] cells, degree of functional heterogeneity, and uncovered possible specialized subpopulations during the different phases of the response to glucose at the level of many individual cells. To this aim, we combined acute mouse pancreas tissue slices with functional multicellular calcium imaging over a wide range from threshold (7 mM) and physiological (8 and 9 mM) to supraphysiological (12 and 16 mM) glucose concentrations, classical physiological, and advanced network analyses. |
|---|
| Keywords: | beta cells, calcium imaging, glucose-dependence, network analysis |
|---|
| Publication status: | Published |
|---|
| Publication version: | Version of Record |
|---|
| Submitted for review: | 04.02.2021 |
|---|
| Article acceptance date: | 09.07.2021 |
|---|
| Publication date: | 09.08.2021 |
|---|
| Publisher: | American Physiological Society |
|---|
| Year of publishing: | 2021 |
|---|
| Number of pages: | Str. 305-323 |
|---|
| Numbering: | Letn. 321, št. 2 |
|---|
| PID: | 20.500.12556/DKUM-90992  |
|---|
| UDC: | 612 |
|---|
| ISSN on article: | 0193-1849 |
|---|
| COBISS.SI-ID: | 75400451 |
|---|
| DOI: | 10.1152/ajpendo.00043.2021 |
|---|
| Publication date in DKUM: | 15.10.2024 |
|---|
| Views: | 175 |
|---|
| Downloads: | 79 |
|---|
| Metadata: |    |
|---|
| Categories: | Misc.
|
|---|
|
:
|
Copy citation |
|---|
| | | | Average score: | (0 votes) |
|---|
| Your score: | Voting is allowed only for logged in users. |
|---|
| Share: |  |
|---|
Hover the mouse pointer over a document title to show the abstract or click
on the title to get all document metadata. |
