Modeling calcium waves in an anatomically accurate three-dimensional parotid acinar cell

JOURNAL OF THEORETICAL BIOLOGY

卷:419

Article

Sneyd, James¹  Means, Shawn¹  Di Zhu¹  Rugis, John¹  Won, Jong Hak²  Yule, David I.² 

[1] Univ Auckland, Dept Math, Auckland, New Zealand

[2] Univ Rochester, Med Ctr, Dept Physiol & Pharmacol, Rochester, NY 14627 USA

关键词: Saliva secretion;    Inositol trisphosphate receptor;    Ryanodine receptor;    Calcium oscillations;    Multiscale modeling;   

DOI  :  10.1016/j.jtbi.2016.04.030

来源: Elsevier

【 摘 要 】

We construct a model of calcium waves in a three-dimensional anatomically accurate parotid acinar cell, constructed from experimental data. Gradients of inositol trisphosphate receptor (IPR) density are imposed, with the IPR density being greater closer to the lumen, which has a branched structure, and inositol trisphosphate (IP3) is produced only at the basal membrane. We show (1) that IP3 equilibrates so quickly across the cell that it can be assumed to be spatially homogeneous; (2) spatial separation of the sites of IP3 action and IP3 production does not preclude the formation of stable oscillatory Ca2+ waves. However, these waves are not waves in the mathematical sense of a traveling wave with fixed profile. They result instead from a time delay between the Ca2+ rise in the apical and basal regions; (3) the ryanodine receptors serve to reinforce the Ca2+ wave, but are not necessary for the wave to exist; (4) a spatially independent model is not sufficient to study saliva secretion, although a one-dimensional model might be sufficient. Our results here form the first stages of the construction of a multiscale and multicellular model of saliva secretion in an entire acinus.

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