Title

Detection of changes in near-membrane Ca2+ concentration using a novel membrane-associated Ca2+ indicator

UMMS Affiliation

Department of Physiology; Program Molecular Medicine

Date

4-1-1994

Document Type

Article

Subjects

Animals; Bufo marinus; Calcium; Cell Membrane; Fluorescent Dyes; Fura-2; Indicators and Reagents; Microscopy, Fluorescence; Muscle, Smooth; Spectrometry, Fluorescence; Stomach

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

A Ca2+ indicator has been synthesized and characterized which can be used to monitor rapid changes in the free Ca2+ concentration ([Ca2+]) immediately adjacent to cell membranes. This indicator, referred to as C18-Fura-2, consists of a Fura-2 molecule conjugated to a lipophilic alkyl chain which will insert into cell membranes. When associated with cell membranes in low concentrations, C18-Fura-2 exhibits an excitation spectrum with a large Stokes shift and a single isobestic point, thus [Ca2+] can be calculated ratiometrically. The apparent Ca2+ dissociation constant of cell-associated C18-Fura-2 is around 150 nM. C18-Fura-2 orients in the cell membrane so that the fluorophore is facing the side to which it was applied. C18-Fura-2 was used to record rapid changes in intracellular [Ca2+] which occurred in response to membrane depolarization in isolated smooth muscle cells. The initial rise of the [Ca2+] transient reported by C18-Fura-2 was four to six times faster than the rise of the [Ca2+] transient reported by cytosolic Fura-2. This result suggests that C18-Fura-2 was located at the plasma membrane near sites of Ca2+ influx and indicates that membrane-associated Ca2+ indicators can be used to detect rapid, localized changes in [Ca2+] which are obscured in signals recorded using water-soluble, bulk cytosolic fluorescent Ca2+ indicators.

Rights and Permissions

Citation: J Biol Chem. 1994 Apr 1;269(13):10141-9.

Related Resources

Link to Article in PubMed

Journal Title

The Journal of biological chemistry

PubMed ID

8144515