Voltage dependent calcium channels in cerebellar granule cell primary cultures

O. Moran, F. Lin, O. Zegarra-Moran, M. Sciancalepore

Research output: Contribution to journalArticle

Abstract

Voltage activated calcium channels were studied in rat cerebellar granule cells in primary culture. Macroscopic currents, carried by 20 m M Ba2+, were measured in the whole-cell configuration. Slowly inactivating macroscopic currents, with a maximum value at a membrane potential around 5 mV were recorded between the 1st and the 4th day in culture. These currents were completely blocked by 5 m M Co2+, partially blocked by 10 μM nifedipine, and increased by 2 to 5 μM BAY K-8644. Two types of channels, in the presence of 80 m M Ba2+, were identified by single channel recording in cell-attached patches. The first type, which was dihydropyridine agonist sensitive, had a conductance of 18 pS, a half activation potential of more than 10 mV and did not inactivate. This type of channel was the only type found during the first four days in culture, although it was also present up to the 11th day. The second type of channel was dihydropyridine insensitive, had a conductance of 10 pS, a half activation potential less than -15 mV and displayed voltage dependent inactivation. This second type of channel was found in cells for more than four days in culture.

Original languageEnglish
Pages (from-to)157-164
Number of pages8
JournalEuropean Biophysics Journal
Volume20
Issue number3
DOIs
Publication statusPublished - May 1991

Keywords

  • Calcium channels
  • Cerebellar granule cells
  • Patch clamp

ASJC Scopus subject areas

  • Biophysics

Fingerprint Dive into the research topics of 'Voltage dependent calcium channels in cerebellar granule cell primary cultures'. Together they form a unique fingerprint.

  • Cite this