Evaluation of Calcium Influx Factors from Stimulated Jurkat T-lymphocytes by Microinjection into Xenopus Oocytes
Year: 1995
Type: article
Abstract: Acid extracts of thapsigargin-activated Jurkat cells have been shown to have intracellular activity in inducing a dose-dependent rapid chloride current upon microinjection in Xenopus laevis oocytes. The extracts act by elevation of calcium through calcium entry. The factor(s) responsible for this activity have been termed calcium influx factor (CIF) and have been found to be small, relatively polar molecules (< 1000 daltons) whose activity is abolished by alkaline phosphatase treatment and potentiated by co-injection of okadaic acid (a protein phosphatase inhibitor). CIF is produced in a time-dependent manner following thapsigargin treatment of Jurkat cells, being first elevated above basal levels by 2 min. Intracellular CIF activity is completely absent from NG115-401L neuronal cells, which lack capacitative entry. On this basis, it appears that Jurkat cells, activated by stimuli that deplete internal calcium stores, produce one or more CIF activities acting intracellularly, and Xenopus oocytes may be a powerful tool to purify and characterize CIFs.
Source: Journal of Biological Chemistry
Authors: David Thomas, Michael R. Hanley
Institution: University of California, Davis
Language: English
Topic: Ion Channels and Receptors
Subfield: Sensory Systems
Field: Neuroscience
Domain: Life Sciences
Open Access status: hybrid
Estimated APC paid: $3,430
OpenAlex ID: W1964761958