| Title: | Critical and supercritical spatiotemporal calcium dynamics in beta cells |
|---|
| Authors: | ID Gosak, Marko (Author)
ID Stožer, Andraž (Author)
ID Markovič, Rene (Author)
ID Dolenšek, Jurij (Author)
ID Perc, Matjaž (Author)
ID Rupnik, Marjan (Author)
ID Marhl, Marko (Author) |
|---|
| Files: |  Frontiers_in_Physiology_2017_Gosak_et_al._Critical_and_Supercritical_Spatiotemporal_Calcium_Dynamics_in_Beta_Cells.pdf (3,43 MB)
MD5: 4EA161605A3548418E7DCD104D7CA2CA
PID: 20.500.12556/dkum/541d2df0-2f56-4270-89c3-ce0c5d6aad34
 http://journal.frontiersin.org/article/10.3389/fphys.2017.01106/full
|
|---|
| Language: | English |
|---|
| Work type: | Scientific work |
|---|
| Typology: | 1.01 - Original Scientific Article |
|---|
| Organization: | MF - Faculty of Medicine
|
|---|
| Abstract: | A coordinated functioning of beta cells within pancreatic islets is mediated by oscillatory membrane depolarization and subsequent changes in cytoplasmic calcium concentration. While gap junctions allow for intraislet information exchange, beta cells within islets form complex syncytia that are intrinsically nonlinear and highly heterogeneous. To study spatiotemporal calcium dynamics within these syncytia, we make use of computational modeling and confocal high-speed functional multicellular imaging. We show that model predictions are in good agreement with experimental data, especially if a high degree of heterogeneity in the intercellular coupling term is assumed. In particular, during the first few minutes after stimulation, the probability distribution of calcium wave sizes is characterized by a power law, thus indicating critical behavior. After this period, the dynamics changes qualitatively such that the number of global intercellular calcium events increases to the point where the behavior becomes supercritical. To better mimic normal in vivo conditions, we compare the described behavior during supraphysiological non-oscillatory stimulation with the behavior during exposure to a slightly lower and oscillatory glucose challenge. In the case of this protocol, we observe only critical behavior in both experiment and model. Our results indicate that the loss of oscillatory changes, along with the rise in plasma glucose observed in diabetes, could be associated with a switch to supercritical calcium dynamics and loss of beta cell functionality. |
|---|
| Keywords: | beta cells, islets of Langerhans, self-organized criticality, intercellular dynamics, calcium waves, glucose oscillations, computational model, confocal calcium imaging |
|---|
| Publication status: | Published |
|---|
| Publication version: | Version of Record |
|---|
| Year of publishing: | 2017 |
|---|
| Number of pages: | str. 1-17 |
|---|
| Numbering: | Letn. 8 |
|---|
| PID: | 20.500.12556/DKUM-69461  |
|---|
| ISSN: | 1664-042X |
|---|
| UDC: | 612.349.7 |
|---|
| ISSN on article: | 1664-042X |
|---|
| COBISS.SI-ID: | 512760376 |
|---|
| DOI: | 10.3389/fphys.2017.01106 |
|---|
| NUK URN: | URN:SI:UM:DK:L9BI3QYW |
|---|
| Publication date in DKUM: | 23.01.2018 |
|---|
| Views: | 2008 |
|---|
| Downloads: | 428 |
|---|
| 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. |
