Nonadrenergic, Noncholinergic Responses of the Rabbit Detrusor Smooth Muscle and the Role of L-Arginine/Nitric Oxide Pathway in These Responses
Yükleniyor...
Dosyalar
Tarih
2000
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Prous Science, Sa
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In the present study, nonadrenergic, noncholinergic (NANC) responses of rabbit detrusor smooth muscle and the possible involvement of the L-arginine/nitric oxide (L-ARG/NO) pathway was investigated. In the presence of atropine (10(-6) M) and guanithidine (10(-5) M), frequency-response curves were obtained by stimulating tissue with 10-sec trains or increasing frequencies (1-10 Hz) with 3-min intervals between stimulations. Electrical field stimulation (EFS) evoked a biphasic response in rabbit detrusor smooth muscle, consisting of an initial contraction followed by relaxation. ATP desensitization significantly inhibited contractions. L-NAME(10(-5) M) increased the contractions by a maximum of 33 +/- 5% at 1 Hz, 37 +/- 5% at 2 Hz, 18 +/- 4% at 4 Hz. 20 +/- 3% at 8 Hz and 15 +/- 4% at 10 Hz. In detrusor preparations, exposure to L-NAME (N-G-nitro-L-arginine methyl ester, 10(-5) M) significantly reduced the maximal relaxation to electrical stimulation to 7 +/- 3% of the control. In the presence of L-ARG (10(-4) M), contractions induced by electrical field stimulation (EFS) at 1, 2, 4, 8 and 10 Hz were reduced by 20 +/- 4, 24 +/- 3, 25 +/- 3, 20 +/- 3 and 30 +/- 5%, respectively. Exposure to L-ARG (10(-4) M) significantly increased the maximal relaxation to electrical stimulation to 52 +/- 5% of the control. Exogenously applied ATP (10(-5)- 10(-2) M) to rabbit detrusor muscle resulted in contractions while sodium nitroprusside (10(-7)-10(-3) M) caused concentration-dependent relaxation. These results suggest that nitric oxide (NO) acts as an inhibitory NANC neurotransmitter in the rabbit detrusor smooth muscle. Additionally, NANC contractions mediated by ATP released from NANC nerves, may be masked by thr L-ARG/NO pathway in this tissue.
Açıklama
Anahtar Kelimeler
in vitro, detrusor (rabbit), nonadrenegic, noncholinergic (NANC) responses, L-arginine/nitric oxide (L-ARG/NO) pathway
Kaynak
Methods and Findings in Experimental and Clinical Pharmacology
WoS Q Değeri
Q4
Scopus Q Değeri
N/A
Cilt
22
Sayı
1
Künye
Şahin, A. S., Atalık, K. E., Doğan, N., (2000). Nonadrenergic, Noncholinergic Responses of the Rabbit Detrusor Smooth Muscle and the Role of L-Arginine/Nitric Oxide Pathway in These Responses. Methods and Findings in Experimental and Clinical Pharmacology, 22(1), 31-35. Doi: 10.1358/mf.2000.22.1.795821
