Systematic application of gas chromatography to the analysis of pharmaceutical preparations.
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Short-chain fatty acid injection into animals produces coma, seizures, and hyperventilation. One mechanism of coma production may be through alterations in membrane permeability characteristics. The SPG histofluorescence technique was used to evaluate changes in blood-brain barrier permeability to injected L-dopa in rats after intraperitoneal injections of the short-chain fatty acid, sodium octanoate. Diffusion of intravascular fluorescence was observed around brain capillaries in the octanoate-injected rats suggesting an alteration in capillary permeability to L-dopa. Diffusion of fluorescence around neuronal cell bodies and brain fiber tracts was also seen after treatment with octanoate. These findings suggest that octanoate may also alter neuronal membrane function.
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The blood vessels in the rabbit ear have been used to investigate the effects of octapressin on vascular smooth muscle. Continuous administration of this drug resulted in tachphlatis. Cocaine enhanced the response of the ear to octapressin; however, this potentiation was not evident when phentolamine was concurrently added to the perfusate. Denervation and reserpinisation of the ear also eliminated the potentiation of octapressin's response by cocaine. The results suggest that there is a small, indirect sympathomimetic component involved in octapressin's action on the vasculature.