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Abstract

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turpentine, mustard oil, formalin, xylene, capsaicin µîÀÌ ÀÖ´Ù.
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³»¿¡´Â ¿©·¯ °¡Áö ¹°Áú, Áï vasoactive intestinal peptids, substance P(SP), calcitonin
generelated peptide (CGRP), enkephaln(ENK), cholecystokinin ¹× nitric oxide¸¦ ÇÔÀ¯ÇÏ°í
ÀÖÀ¸¸ç wheat germ agglutinin horseradish peroxidase(WGA-HRP) labeling ¹æ¹ý¿¡ ÀÇÇϸé
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»ç)¿Í acetic auld³ª capsalcin°ú °°Àº ÅëÁõ À¯¹ß ¹°Áú¿¡ ÀÇÇÑ ¹è´¢(ÅëÁõ¼º ¹è´¢¹Ý»ç)ÀÇ Â÷ÀÌ
¸¦ ºñ±³ÇÏ°íÀÚ ÇÑ´Ù ±×¸®°í °æ¸·³»·Î ÅëÁõ ¾ïÁ¦¹°ÁúÀÎ ENKÀ» ÁÖÀÔÇÏ¿© ¹è´¢¹Ý»ç¿¡ ¹ÌÄ¡´Â
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¾Ë¾Æº¸±â À§ÇÏ¿© º» ½ÇÇèÀ» °èȹÇÏ¿´´Ù.
#ÃÊ·Ï#
Purpose : Irritations or painful stimuli to the bladde: may alter voiding behaviorand
this may be associated with dysfunction of periurethral muscles. In our study, recording
of bladder and sphincter activity in response to intravesical irritants(acetic acid,
capsaicin) was done and the effects of Intrathecal administration of
transmitters(enkephalin, susbtance P and its antagonist, or calcitonin gene related peptide
and its antagonist) was analyzed
Materials and Methods : Adult male Sprague-Dawley rats(400-500gm) were
anesthetized with intraperitoneal urethane mixed with entobar. The left femoral artery
and vein were cannulated for blood pressure monitoring and drug administration. A
catheter(PE 50) was inserted into the bladder dome through a midline abdominal incision
and bipolar electromyographic(EMG) needle electrodes were placed into the urethral
sphincter. Peak contractile pressure and EMG activities were measured on a polygraph.
Saline, acetic acid, or capsaicin was infused into the bladder at 50¥ì1/min and saline,
enkephalin (ENK), substance P(SP) and its antagonist, or calcitonin gene related peptide
(CGRP) and its antagonist was administered intrathecally.
Results : Each micturition cycle started with an increase in bladder pressure which
triggered the contraction of the external urethral sphincter. Fast Fourier transform(FFT)
analysis of the external sphincter EMG revealed a peak activity at 500Hz. The inteNal
and duration of EIOG bursts were 38¡¾2 msec and 92¡¾10 msec respectively. The
interval of bladder contraction was 809¡¾23 sec. Intravesical acetic acid and capsaicin
activated micturition reflex earlier than in control group and intrathecal ENK, SP
antagonist, and CGRP antagonist attenuated the parameters in activated micturition
reflex.
Conclusions : Urethral sphincter EMG showed constant burst duration and interval in
spite of the infusion of acetic acid or capsaicin. Intravesical acetic acid or capsaicin
increased the peak amplitude of intravesical pressure, lowered voided volume, and
shortened EMG spike duration and voiding interval significantly. Intrathecal injection of
ENK, SP, SP antagonist, CGRP, and CGRP antagonist changed the parameters,
especially the voiding interval, voiding duration and peak pressure of the bladder.
(Korean J Urol 1998; 39: 729¡­36)

Å°¿öµå

Urinary bladder; Painful stimuli; Intrathecal transmitter; Micturition reflex;

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