Abstract：
BACKGROUND:Microscope chambers that accept glass coverslips with cultured cells are often used to monitor intracellular Ca2+ concentration ([Ca2+]i) during cell superfusion. Unfortunately, the experimental maneuvers associated with the coverslip installation in these chambers (medium removal and re-application) trigger unintended [Ca2+]i elevations. NEW METHOD:To prevent these [Ca2+]i elevations, a Petri dish insert has been constructed. The insert features a superfusion-optimized well to grow cell cultures. After this insert is removed from the Petri dish, the well retains the medium. This feature allows the inserts to be installed in microscope chambers while keeping the cells submerged at all times. RESULTS:These inserts were used to test the impact of a transient medium removal from the well (an equivalent of a coverslip removal from the medium) on [Ca2+]i in primary murine cortical neurons and astrocytes, and in HEK-293 cells. In all of these models, the medium removal/re-application caused a micromolar [Ca2+]i spike. While in neurons this spike was caused by a Ca2+ influx, in astrocytes and HEK-293 cells, it was caused by a Ca2+ release from intracellular stores. After the spike, a subpopulation of neurons failed to restore low [Ca2+]i; in 24% of the astrocytes, the spike triggered [Ca2+]i oscillations. However, prior to the spike, [Ca2+]i was low and uniform in all these cells. COMPARISON WITH EXISTING METHOD(S):The new method avoids the artificially-induced [Ca2+]i elevations that take place during the handling of glass coverslips with cultured cells. CONCLUSIONS:The new method allows monitoring [Ca2+]i without disturbing the basal [Ca2+]i levels.
journal_name
J Neurosci Methodsjournal_title
Journal of neuroscience methodsauthors
Kiedrowski L,Feinerman Adoi
10.1016/j.jneumeth.2017.11.007subject
Has Abstractpub_date
2018-01-15 00:00:00pages
111-115eissn
0165-0270issn
1872-678Xpii
S0165-0270(17)30387-4journal_volume
294pub_type
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