Bushi-richu-to Raises Calcitonin Gene-related Peptide, Substance P, Somatostatin, and Vasoactive Intestinal Polypeptides Levels in Human Plasma

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The traditional Japanese Kampo medicine Bushi-richu-to (Bushi-ninjin-to) has been empirically used for the treatment of chronic gastroenteritis, gastric atony, and chronic constipation accompanied by a feeling of coldness in the body. One of the mechanisms of the empirical effects is assumed to be due to local changes in gut-regulated peptide levels. We studied the effect of Bushi-richu-to on calcitonin gene-related peptide (CGRP)-, substance P-, vasoactive intestinal polypeptides (VIP)-, somatostatin-, and motilin-like immunoreactive substances (IS) in plasma taken from healthy subjects. Bushi-richu-to (4.5g) or placebo was orally administered to five healthy males. Blood samples were taken before, and at 20, 40, 60, 90, 120, 180, and 240min after administration, extracted, and then submitted to a highly sensitive enzyme immunoassay system for CGRP-, substance P-, VIP-, somatostatin-, and motilin-IS. A single oral administration of Bushi-richu-to caused significant increases in plasma CGRP-, substance P-, VIP-, and somatostatin-IS levels compared with placebo. It is concluded that Bushi-richu-to might improve a peripheral and uncomfortable feeling of cold and gastrointestinal dysmotility via gut-regulated peptide release.
2007-10-01