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[Properties of membrane ionic currents in pituitary clone cells]
Comptes Rendus Des Seances De La Societe De Biologie Et De Ses Filiales
|January 1, 1983
Summary
GH3 pituitary cells exhibit calcium-dependent inward currents and three distinct outward currents. These include a transient 4-aminopyridine-sensitive current and two voltage-dependent delayed outward currents, one of which is calcium-activated potassium conductance.
Area of Science:
- Neuroscience
- Cell Biology
- Electrophysiology
Context:
- GH3 pituitary cells are a commonly used model for studying neuroendocrine function.
- Understanding ionic currents is crucial for characterizing cell excitability and signaling.
Purpose:
- To characterize the membrane ionic currents in GH3 pituitary cells using voltage clamp techniques.
- To identify the ion carriers and pharmacological properties of these currents.
Summary:
- Voltage clamp studies revealed a calcium (Ca2+)-dependent inward current in GH3 cells, blocked by cobalt ions (Co2+).
- Three distinct outward currents were identified: a transient 4-aminopyridine (4-AP)-sensitive current and two voltage-dependent delayed outward currents.
- One delayed outward current was sensitive to tetraethylammonium (TEA), while the other, blocked by Co2+, represented a calcium-activated potassium (K+) conductance.
Impact:
- Provides a detailed electrophysiological profile of GH3 pituitary cells.
- Contributes to understanding the mechanisms of hormone secretion and cellular excitability in endocrine cells.
- Offers insights into the specific roles of different ion channels in pituitary cell function.