title: Development of a method to quantitatively monitor the effect of inhibition of nitric oxide synthase on tumour vascular activity using dynamic contrast-enhanced computed tomography.
abstract: This study was undertaken to develop a method to quantitatively monitor the effect of inhibition of nitric oxide synthase (NOS) on tumour vascular activity using dynamic contrast-enhanced computed tomography (DCE-CT). The DCE-CT studies were performed in 13 anaesthetized rats bearing tumours. To investigate the effect of NOS inhibition, N-nitro-L-arginine (L-NNA) was intravenously administered in eight rats, while only the vehicle was administered in five rats. The contrast enhancement (CE) images were generated by subtracting the CT images before and after the administration of contrast agent. The tumour blood volume (TBV) images were also generated. The CE significantly decreased after L-NNA administration, while there were no significant changes when only the vehicle was administered. There was a good correlation between CE and TBV, suggesting that CE mainly reflects TBV. In conclusion, the present method appears to be useful for monitoring the effect of NOS inhibition on tumour vascular activity.
authors.affiliation: Department of Medical Physics and Engineering, Division of Medical Technology and Science, Faculty of Health Science, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kusakabe
authors.forename: S
authors.initials: S
authors.lastname: Miyazaki
authors.forename: A
authors.initials: A
authors.lastname: Tachibana
authors.forename: R
authors.initials: R
authors.lastname: Matsuura
authors.forename: N
authors.initials: N
authors.lastname: Matsuura
authors.forename: K
authors.initials: K
authors.lastname: Murase
mesh_terms: D000818:Animals; D001810:Blood Volume / Q000187:drug effects*; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D008297:Male; D009369:Neoplasms / Q000098:blood supply*; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors*; D019335:Nitroarginine / Q000494:pharmacology*; D011856:Radiographic Image Enhancement / Q000379:methods*; D051381:Rats; D011916:Rats, Inbred F344; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D004791:Enzyme Inhibitors; D019335:Nitroarginine; D019001:Nitric Oxide Synthase