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. 2000 Sep;47(3):337–342. doi: 10.1136/gut.47.3.337

Functional assessment of β adrenoceptor subtypes in human colonic circular and longitudinal (taenia coli) smooth muscle

L Manara 1, T Croci 1, G Aureggi 1, F Guagnini 1, J Maffrand 1, G Le Fur 1, S Mukenge 1, G Ferla 1
PMCID: PMC1728040  PMID: 10940268

Abstract

BACKGROUND AND AIMS—The subtype and species related heterogeneity of β adrenoceptors prompted a functional reappraisal of these molecular targets of motility inhibition in the human colon.
METHODS—Relaxation of muscle strips was measured in vitro.
RESULTS—The following agonists had decreasing relaxing potency (effective concentration range 10−8-10−4 mol/l): (−)isoprenaline (non-selective), terbutaline (β2 selective), CGP 12177 (β3 selective, also β1, β2 antagonist), and SR 58611A (β3 selective). Isoprenaline and terbutaline were more potent on circular than taenia strips; CGP 12177 and SR 58611A weakly and partially relaxed taenia but had little effect on circular strips. The potency of isoprenaline on circular strips was greatly reduced by the β1 selective antagonist CGP 20712 (10−7 mol/l), and less so by ICI 118551 (10−7 mol/l, β2 selective). CGP 20712 and ICI 118551 together (both 3×10-6 mol/l) had no effect on taenia relaxation by SR 58611A and rendered isoprenaline and terbutaline virtually inactive on circular strips, although not on taenia, which was relaxed at higher than control concentrations and maximally by isoprenaline. Propranolol, a β1, β2 non-selective antagonist, at high concentrations (10-5 mol/l) prevented taenia relaxation by CGP 12177 and SR 58611A; its quantitative antagonism of isoprenaline (in common with that of CGP 12177 used as an antagonist) was competitive in circular strips but not on taenia.
CONCLUSIONS—β1, β2, and β3 adrenoceptors are functionally detectable in the human colon; agonist stimulation of any one type relaxed taenia but only isoprenaline was fully effective at the β3 subtype.


Keywords: β adrenoceptor subtypes; human colon; smooth muscle; taenia coli

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Figure 1  .

Figure 1  

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Concentration dependent relaxation of human colon by isoprenaline. (A) Representative tracings; values are mol/l of isoprenaline. (B) Concentration-response curves in circular smooth muscle with and without added β adrenoceptor antagonists; values are mean (SEM) of 5-10 preparations from different patients. (C) Concentration-response curves in longitudinal smooth muscle with and without added β adrenoceptor antagonists; values are mean (SEM) of 5-10 preparations from different patients.

Figure 2  .

Figure 2  

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Concentration-response curves to terbutaline in human colon circular smooth muscle and taenia coli with and without added β adrenoceptor antagonists. Results are mean (SEM) of 4-6 preparations from different patients.

Figure 3  .

Figure 3  

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Concentration-response curves to CGP 12177 and SR 58611A in human colon circular smooth muscle and taenia coli with and without added β adrenoceptor antagonists. Results are mean (SEM) of 4-6 preparations from different patients.

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