Abstract
Tubular cell apoptosis is a major phenotype of cell death in various forms of acute kidney injury. Quantifying apoptosis in fixed tissues is problematic because apoptosis evolves over time and dead cells are rapidly cleared by the phagocytic system. Phiphilux is a fluorescent probe that is activated specifically by caspase 3 and does not inhibit the subsequent activity of this effector caspase. It has been used successfully to quantify apoptosis in cell culture. Here we examined the feasibility of using Phiphilux to measure renal tubular apoptosis progression over time in live animals using intravital 2-photon microscopy. Our results show that Phiphilux can detect apoptosis in S2 tubules but is activated non-specifically in S1 tubules.
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