The Effects of Parathyroid Hormone-related Protein (PTHrP) (1-34) on the Detrusor Muscle Contraction of Rabbits / 대한비뇨기과학회지
Korean Journal of Urology
;
: 237-242, 2002.
Article
in Korean
| WPRIM
| ID: wpr-204892
ABSTRACT
Purpose:
We have studied the effect of Parathyroid hormone-related protein (PTHrP) (1-34) on the contraction of bladder muscle induced by various stimulations. MATERIALS ANDMETHODS:
Bladder muscle strips were prepared from the urinary bladder obtained from male New Zealand White rabbits (2-2.5Kg, n=20). The isometric contractile force responses were monitored via a FT03 force transducer. PTHrP (1-34) was introduced in spontaneous contraction, carbachol (CCh) (0.5microM)-induced the contraction, and a high potassium solution (60mM) induced the contraction to monitor the responses. In addition, the effect of PTHrP (1-34) was monitored in the pre-treatment of a calcium channel blocker, nicardipine.RESULTS:
PTHrP (1-34) (10 10-10 7M) reduced most of the basal spontaneous contractile responses. According to the increasing concentration, PTHrP (1-34) (10 10 -10 7M) reduced 64.6+/-8.4% of the CCh (0.5microM) induced contractions, and 34.3+/-17.4% of the high concentration potassium solution (60mM) doses induced a contraction. After nicardipine (5.0microM) treatment, pretreating with PTHrP (1-34) (10 7M) showed a 33.5+/-15.5% CCh (0.5microM) increase in induced contractions compared to thr control.CONCLUSIONS:
PTHrP (1-34) reduced the spontaneous phasic activity of the smooth muscle strip and caused a concentration-dependent relaxation of the contraction, which induced by carbachol or a high concentration potassium solution. These results support the hypothesis that PTHrP is a regulator of bladder tones. This study results suggested that there is some other mechanism of PTHrP (1-34) on the smooth muscles of the bladder, which is not related to a voltage-sensitive calcium channel.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Potassium
/
Relaxation
/
Transducers
/
Urinary Bladder
/
Carbachol
/
Nicardipine
/
Calcium Channels
/
Parathyroid Hormone-Related Protein
/
Muscle Contraction
/
Muscle, Smooth
Limits:
Animals
/
Humans
/
Male
Language:
Korean
Journal:
Korean Journal of Urology
Year:
2002
Type:
Article
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