Marko Gosak (Author), Rene Markovič (Author), Aleš Fajmut (Author), Marko Marhl (Author), Marko Hawlina (Author), Sofija Andjelić (Author)

Abstract

In this work we investigated how modifications of the Ca2+ homeostasis in anterior lens epithelial cells (LECs) are associated with different types of cataract (cortical or nuclear) and how the progression of the cataract (mild or moderate) affects the Ca2+ signaling. We systematically analyzed different aspects of intra- and inter-cellular Ca2+ signaling in the human LECs, which are attached to surgically isolated lens capsule (LC), obtained during cataract surgery. We monitored the temporal and spatial changes in intracellular Ca2+ concentration after stimulation with acetylcholine by means of Fura-2 fluorescence captured with an inverted microscope. In our analysis we compared the features of Ca2+ signals in individual cells, synchronized activations, spatio-temporal grouping and the nature of intercellular communication between LECs. The latter was assessed by using the methodologies of the complex network theory. Our results point out that at the level of individual cells there are no significant differences when comparing the features of the signals with regard either to the type or the stage of the cataract. On the other hand, noticeable differences are observed at the multicellular level, despite inter-capsule variability. LCs associated with more developed cataracts were found to exhibit a slower collective response to stimulation, a less pronounced spatio-temporal clustering of LECs with similar signaling characteristics. The reconstructed intercellular networks were found to be sparser and more segregated than in LCs associated with mild cataracts. Moreover, we show that spontaneously active LECs often operate in localized groups with quite well aligned Ca2+ activity. The presence of spontaneous activity was also found to affect the stimulated Ca2+ responses of individual cells. Our findings indicate that the cataract progression entails the impairment of intercellular signaling thereby suggesting the functional importance of altered Ca2+ signaling of LECs in cataractogenesis.

Keywords

intracellular calcium signaling;intercellular calcium signaling;anterior lens;epithelial cells;cataract;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM MF - Faculty of Medicine
UDC: 617.7
COBISS: 2645676 Link will open in a new window
ISSN: 1932-6203
Views: 894
Downloads: 376
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Other data

Secondary language: Slovenian
Secondary keywords: medcelični prenos kalcija;leča;epitelijske celice;katarakta;
URN: URN:SI:UM:
Type (COBISS): Scientific work
Volume: ǂVol. ǂ10
Issue: ǂiss. ǂ12
Chronology: 2015
DOI: 10.1371/journal.pone.0143781
ID: 10843450