Abstract
1) Oxymetazoline, which has been known as an agonist for${\alpha}_1-adrenoceptor$ in various peripheral tissues, caused a pressor response in urethane-anesthetized rabbits when given intra-ventricularly. This pressor response was little affected by pretreatment of rabbits with i.v. guanethidine or chlorisondamine, but it was weakened in rabbits pretreated with either of i.v. phentolamine or guanethidine and chlorisondamine and in guanethidine-pretreated adrenal-ligated rabbits. 2) The pressor to intraventricular oxymetazoline was markedly attenuated by intraventricular pretreatment with prazosin, whereas intraventricular pretreatment with yohimbine or piperoxan did not affect this response. 3) Reserpine-pretreated rabbits also responded with hypertension to intraventricular oxymetazoline, which was markedly diminished by pretreatment with intraventricular prazosin but not affected by yohimbine. 4) Oxymetazoline, given intravenously, produced a pressor response in both whole and spinal rabbits. Intravenous prazosin, phentolamine and yohimbine, in this order, showed greater antagonizing effect to this pressor response. 5) The results indicate that oxymetazoline acts an agonist for ${\alpha}_1-adrenoceptors$ in the rabbit brain participating in the regulation of the blood pressure and in the vasculature of rabbits.
1) 여러가지 말초(末梢) 조직(組織)에서 ${\alpha}_1-adrenoceptor$의 agonist로 알려져 있는 oxymetazoline의 측뇌실내(側腦室內) 투여(投與)는 urethane마취가토(麻醉家兎)의 혈압상승(血壓上昇)을 일으켰다. 이 상승(上昇)은 guanethidine, chlorisondamine처리(處理)로 거의 영향(影響)을 받지 않았고, phenotolamine, guanethidine과 chlorisondamine 또는 부신결찰(副腎結紮)과 guanethidine처리하(處理下)에서는 억제(抑制)되었다. 2) 측뇌실내(側腦室內) oxymetazoline에 의한 혈압상승(血壓上昇)은 측뇌실내(側腦室內) prazosin투여후(投與後)에는 현저(顯著)히 감약(減弱)되었으나 yohimbine 및 piperoxan의 영향(影響)은 받지 않았다. 3) Reserpine처리(處理) 가토(家兎)에서도 측(側) 뇌실내(腦室內) oxymetazoline은 혈압(血壓) 상승(上昇)을 일으켰으며, 이도 측(側) 뇌실내(腦室內) prazosin투여후(投與後)에는 현저(顯著)히 감약(減弱)되었으나 yohimbine의 영향(影響)은 받지 않았다. 4) 전신마취(全身麻醉) 가토(家兎) 및 척수가토(脊髓家兎)에서 정맥내(靜脈內) oxymetazoline은 혈압상승(血壓上昇)을 일으켰으며 이 상승효과(上昇效果)에 대(對)한 정맥내(靜脈內) ${\alpha}_1-adrenoceptor$ antagonist의 길항능력(拮抗能力)은 prazosin, phentolamine, yohimbine의 순(順)으로 강(强)하였다. 5) 본(本) 실험성적(實驗成績)은 oxymetazoline이 혈압조절(血壓調節)에 관여(關與)하는 가토(家兎) 뇌조직(腦組織) 및 가토(家兎) 혈관근(血管筋)에서는 ${\alpha}_1-adrenoceptor$ agonist로 작용(作用)함을 가리키고 있다.