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Isolation and contractile properties of single smooth muscle cells from guinea pig taenia caeci.
- Source :
-
The Japanese journal of physiology [Jpn J Physiol] 1984; Vol. 34 (1), pp. 41-54. - Publication Year :
- 1984
-
Abstract
- A method for the isolation of single smooth muscle cells from guinea pig taenia caeci is described. The single cells were prepared by digestion with 0.3% collagenase and 0.6% trypsin inhibitor in Ca2+-free solution. This procedure produced a high yield of intact cells. Most cells obtained by this procedure were relaxed and showed large contractile responses to excitatory stimulus. Maximal responses of the single cells to acetylcholine (ACh), histamine, and high K+ were attained within 20 sec, and the per cent decrease in cell length was 30-40%. Times for maximal responses of the single cells were shorter than those of the muscle strips. Single cells exhibited a dose-dependent graded response to calcium under depolarized conditions, ACh, histamine, and high K+, and a voltage- and duration-dependent response to electrical stimulation. The ED50s of ACh in the single cells and in the muscle strips were about 2 X 10(-8) and 1.5 X 10(-7) M, respectively. The muscle strips had a lower sensitivity than the single cells to ACh. The generally smooth surface of the relaxed cell contrasted with the numerous evaginations present on the fully contracted cell. I believe that single smooth muscle cells isolated from guinea pig using my technique are, at present, better for physiological and pharmacological studies than are cells isolated using other techniques.
- Subjects :
- Acetylcholine pharmacology
Animals
Atropine pharmacology
Calcium pharmacology
Cecum physiology
Dose-Response Relationship, Drug
Electric Stimulation
Gastrointestinal Motility drug effects
Guinea Pigs
Histamine pharmacology
Ion Channels physiology
Microscopy, Electron, Scanning
Potassium pharmacology
Muscle Contraction drug effects
Muscle, Smooth physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0021-521X
- Volume :
- 34
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- The Japanese journal of physiology
- Publication Type :
- Academic Journal
- Accession number :
- 6328080
- Full Text :
- https://doi.org/10.2170/jjphysiol.34.41