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. 1972 Nov;46(3):423–437. doi: 10.1111/j.1476-5381.1972.tb08140.x

The effect of cold storage on the adrenergic mechanisms of intestinal smooth muscle

K Hattori, K Kurahashi, J Mori, S Shibata
PMCID: PMC1666557  PMID: 4656605

Abstract

1. In the guinea-pig taenia caecum, fluorescent adrenergic fibres terminate in both muscle layers. The density of these fibres is greater in the taenia than in the underlying circular muscle layer. The myenteric plexus and individual ganglion cells are also densely innervated by intensely fluorescent adrenergic nerve fibres.

2. After three days of cold storage, the specific fluorescence disappeared from all tissue layers of the taenia caecum and smooth muscle fibres. In contrast, cholinesterase active substances were still demonstrable in all tissue layers even after seven days of cold storage but the density of these substances was decreased.

3. Cold storage (3-7 days) decreased the tissue noradrenaline content and did not modify the cholinesterase enzyme activity (4 days).

4. In cold stored strips, the inhibitory response to nicotine, 1,1-dimethyl-4-phenylpiperazinium iodide (DMPP) or electrical transmural stimulation was abolished and enhancement of the contractile response occurred. Cold storage also inhibited the inhibitory action of tyramine. Similar results were observed after reserpine treatment.

5. In fresh taenia, the relaxation produced by nicotine, DMPP and electrical transmural stimulation was inhibited by adrenoceptor blocking agents and bretylium. In cold storage preparations, contraction produced by these stimuli was blocked by parasympathetic blocking agents and potentiated by anti-cholinesterase. These results indicate that the inhibitory response to these stimulants is mediated by stimulation of the adrenergic nerve system more than by non-adrenergic nerves; the excitatory effect is probably due to stimulation of cholinergic nerves.

6. These results suggest that the adrenergic mechanisms of the taenia caecum are more labile in cold storage than the cholinergic mechanisms. Thus, the inhibitory action of cold storage on the relaxation produced by nicotine, DMPP, and transmural stimulation is probably explained by selective physical degeneration of the adrenergic nerve terminal. Also, enhancement of the contractile response to these stimulants in cold stored preparations is explained by the lack of adrenergic inhibitory mechanisms.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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