TY - JOUR
T1 - Intracellular calcium mobilization of the aganglionic intestine in the endothelin B receptor gene -deficient rat
AU - Nakatsuji, Takanori
AU - Ieiri, Satoshi
AU - Masumoto, Kouji
AU - Akiyoshi, Junko
AU - Taguchi, Tomoaki
AU - Suita, Sachiyo
N1 - Funding Information:
The authors are very grateful to Dr Ohno Yasuharu, MD, Pediatric Surgery, Saitama Medical University, Japan, for kindly providing EDNRB(−/+) rats, and also Mr Brian Quinn for linguistic comments and help with the manuscript. This study was supported in part by a grant-in-aid for scientific research from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
PY - 2007/10
Y1 - 2007/10
N2 - Background and Aim: Up to now, numerous reports have analyzed the pathogenesis of Hirschsprung's disease (HD) by means of physiologic, pathologic, or molecular biologic methods. However, very little is still known about the smooth muscle cell itself. The endothelin B receptor gene-deficient (EDNRB(-/-)) rat, which is suitable for research of HD, has an aganglionic segment of the total colon. Our purpose is to investigate the myogenic mechanisms using simultaneous measurements of the intracellular Ca2+ concentration ([Ca2+]i) and tension and reverse transcriptase polymerase chain reaction for L-type Ca2+ channel (L-VOC) expression. Methods: The muscle strips of the rat distal colon were loaded with a Ca2+ indicator dye, fura-PE3/AM, for 3 to 4 hours. The changes in the fluorescence intensity of Ca2+-fura-PE3 complex of the strips were monitored with a front surface fluorometer (CAM-230). The fluorescence intensities at 340- and 380-nm excitation and their ratio (F340/F380) were recorded as the level of [Ca2+]i. The comparison of L-VOC α1c subunit messenger RNA (mRNA) expression in both wild and homozygous rat was performed by reverse transcriptase polymerase chain reaction. Results: The peak levels of force development induced by carbachol were 139.1% ± 5.0% in EDNRB(-/-) rat, whereas the peak levels were 242.1% ± 27.7% in EDNRB(+/+) rat. The changes in the [Ca2+]i elevation induced by carbachol were 101.7% ± 12.2% in the homozygous rat, whereas these were 143.8% ± 8.9% in the wild-type rat. Both results in the homozygous rat significantly decreased in comparison with those of the wild rat (P < .05). The expression of the L-VOC channel mRNA also decreased in the homozygous rat. Conclusions: This is the first report to show the [Ca2+]i mobilization in the smooth muscles of the rat model of HD. The decrease in both [Ca2+]i and force development was thus considered to be due to the decrease in the Ca2+ channel expression.
AB - Background and Aim: Up to now, numerous reports have analyzed the pathogenesis of Hirschsprung's disease (HD) by means of physiologic, pathologic, or molecular biologic methods. However, very little is still known about the smooth muscle cell itself. The endothelin B receptor gene-deficient (EDNRB(-/-)) rat, which is suitable for research of HD, has an aganglionic segment of the total colon. Our purpose is to investigate the myogenic mechanisms using simultaneous measurements of the intracellular Ca2+ concentration ([Ca2+]i) and tension and reverse transcriptase polymerase chain reaction for L-type Ca2+ channel (L-VOC) expression. Methods: The muscle strips of the rat distal colon were loaded with a Ca2+ indicator dye, fura-PE3/AM, for 3 to 4 hours. The changes in the fluorescence intensity of Ca2+-fura-PE3 complex of the strips were monitored with a front surface fluorometer (CAM-230). The fluorescence intensities at 340- and 380-nm excitation and their ratio (F340/F380) were recorded as the level of [Ca2+]i. The comparison of L-VOC α1c subunit messenger RNA (mRNA) expression in both wild and homozygous rat was performed by reverse transcriptase polymerase chain reaction. Results: The peak levels of force development induced by carbachol were 139.1% ± 5.0% in EDNRB(-/-) rat, whereas the peak levels were 242.1% ± 27.7% in EDNRB(+/+) rat. The changes in the [Ca2+]i elevation induced by carbachol were 101.7% ± 12.2% in the homozygous rat, whereas these were 143.8% ± 8.9% in the wild-type rat. Both results in the homozygous rat significantly decreased in comparison with those of the wild rat (P < .05). The expression of the L-VOC channel mRNA also decreased in the homozygous rat. Conclusions: This is the first report to show the [Ca2+]i mobilization in the smooth muscles of the rat model of HD. The decrease in both [Ca2+]i and force development was thus considered to be due to the decrease in the Ca2+ channel expression.
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U2 - 10.1016/j.jpedsurg.2007.05.020
DO - 10.1016/j.jpedsurg.2007.05.020
M3 - Article
C2 - 17923193
AN - SCOPUS:34848896848
SN - 0022-3468
VL - 42
SP - 1663
EP - 1670
JO - Journal of Pediatric Surgery
JF - Journal of Pediatric Surgery
IS - 10
ER -