Sex Differences in Ileal Somatostatin-Response after Stress Conditioning in Rats
Mari Kimoto,
Jorge L. Zeredo,
Masato S. Ota,
Zenro Nihei,
Kazuo Toda
Issue:
Volume 3, Issue 3-1, May 2015
Pages:
1-4
Received:
15 December 2014
Accepted:
16 December 2014
Published:
27 February 2015
Abstract: We investigated the effects of somatostatin on the ileal movements after gravity stress and compared these effects between male and female rats. Using an in vitro preparation, measurements of ileal movements evoked by somatostatin application were done at 1, 3, 15 and 30 days after 3G gravity loading-conditioning. Mixed phasic and tonic patterns were observed in the ileal muscle activities. Gravity-stress decreased or antagonized somatostatin inhibitory effects on tonic ileal contraction at an early stage (at day 3) in females, but not in males, indicating that sex differences exist in the way that changes of somatostatin sensitivity is modulated by stress conditioning.
Abstract: We investigated the effects of somatostatin on the ileal movements after gravity stress and compared these effects between male and female rats. Using an in vitro preparation, measurements of ileal movements evoked by somatostatin application were done at 1, 3, 15 and 30 days after 3G gravity loading-conditioning. Mixed phasic and tonic patterns we...
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Ginger-induced Ileal Motility is Modified by Stress: Sex Differences in Rats
Mari Kimoto,
Jorge L. Zeredo,
Masato S. Ota,
Zenro Nihei,
Kazuo Toda
Issue:
Volume 3, Issue 3-1, May 2015
Pages:
5-8
Received:
9 February 2015
Accepted:
10 February 2015
Published:
27 February 2015
Abstract: Ginger is widely used as a spice and also an effective herbal medicine to treat gastrointestinal disorders. On the other hand, stress can induce various modulation of digestive motility. Here, we investigated ginger effects on stress-induced motility of the isolated ileum in male and female rats, in vitro. Rats (Wistar, SPF, 7-12 weeks of age, 148-393 g BW) were divided into Control (1G) and 3G groups. 3G stress (every day for 10 min) was loaded by centrifugal apparatus for 1, 3, 15 and 30 days. After the stress loading at each day, a 1 cm-long section of the ileum was isolated under barbiturate anesthesia and fixed to a Magnus-type chamber filled with Tyrode solution. Ileal movements were observed for 60 s following application of zingerone, which is also called vanillylacetone and a key component of the pungency of ginger (0.1-10 μM). Spontaneous motility movements with phasic and tonic patterns were observed in the ileum. The former was a peristalsis-like movement and the latter was a slow fluctuation of the baseline. Ginger induced enhanced effects on the rhythmic phasic motility in relation to amplitude. In the female, 3G gravity loading had no effects on the ginger-induced motility, however, suppressive effect of the ginger-induced phasic movements was clearly observed at day 15 in the male. The present study showed that gravity stress changed ginger-induced effects on phasic ileal motility in the male, but not in the female, indicating that sex differences were observed in the ginger effects modulated by stress loading.
Abstract: Ginger is widely used as a spice and also an effective herbal medicine to treat gastrointestinal disorders. On the other hand, stress can induce various modulation of digestive motility. Here, we investigated ginger effects on stress-induced motility of the isolated ileum in male and female rats, in vitro. Rats (Wistar, SPF, 7-12 weeks of age, 148-...
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Sansho Intake Modulates Ileum Activity in Stress-loaded Rats
Mari Kimoto,
Jorge L. Zeredo,
Masato S. Ota,
Zenro Nihei,
Kazuo Toda
Issue:
Volume 3, Issue 3-1, May 2015
Pages:
9-12
Received:
25 June 2015
Accepted:
27 June 2015
Published:
3 July 2015
Abstract: Sansho (Japanese pepper) is a common spice widely used in Japanese cuisine. In addition, it is also an important component in Kampo medicine, such as in Daiken Chuto, which stimulates gastrointestinal motility and improves postoperative ileus. On the other hand, we previously reported that gravity stress loading produce negative effects on ileal movements. In the present study, we report changes in ileal motility after gravity-stress with and without Sansho intake in male and female rats. Ileal movements were activated by topical Acetylcholine (Ach) application, and maximum amplitudes (MA) of the evoked contraction were compared. Clear tonic patterns were observed in the ileal motility after Ach application. After short-term stress, there were no significant differences in MA between control and Sansho-intake groups in both sexes. However, after long-term stress-loading, significant enhancement of MA was observed in Sansho-intake group in males, but not in females. The present study showed that SAN affected Ach-induced ileal motility in the male, but not in the female after long-term stress loading, indicating sex differences in effects of Sansho intake. It is suggested that Sansho is more effective in males than in females to decrease negative stress response.
Abstract: Sansho (Japanese pepper) is a common spice widely used in Japanese cuisine. In addition, it is also an important component in Kampo medicine, such as in Daiken Chuto, which stimulates gastrointestinal motility and improves postoperative ileus. On the other hand, we previously reported that gravity stress loading produce negative effects on ileal mo...
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