Dexamethasone attenuates acute macromolecular efflux increase evoked by smokeless tobacco extract.

Dexamethasone attenuates acute macromolecular efflux increase evoked by smokeless tobacco extract.
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地塞米松可减弱无烟烟草提取物引起的急性大分子流出增加。

DOI:
10.1152/jappl.1999.87.2.619
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发表时间:
1999
期刊:
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子:
--
通讯作者:
Rubinstein,I
Rubinstein,I
中科院分区:
--
文献类型:
--
作者:
Gao,XP;Akhter,SR;Ikezaki,H;Hong,D;Rubinstein,I

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本研究的目的是确定地塞米松是否能减弱体内无烟烟草水提取物 (STE) 引起的口腔粘膜大分子流出物的急剧增加,如果是这样,这种反应是否具有特异性。使用活体显微镜,我们发现 20 分钟的 STE 灌注会引起显着的、与浓度相关的渗漏位点形成,并且异硫氰酸荧光素标记的葡聚糖(FITC-葡聚糖;摩尔质量 70 kDa)从原位仓鼠颊囊中的清除率增加(P < 0.05)。地塞米松(10 mg/kg iv)显着减弱了这种反应。地塞米松还可以减弱缓激肽诱导的渗漏位点形成以及颊囊中 FITC-葡聚糖清除率的增加。然而,它对腺苷诱导的反应没有显着影响。地塞米松对基线小动脉直径和缓激肽诱导的颊囊血管舒张没有显着影响。总的来说,这些数据表明地塞米松以特定的方式减弱由 STE 短期弥漫引起的原位口腔粘膜大分子流出的急剧增加。我们建议皮质类固醇可以减轻无烟烟草引起的急性口腔粘膜炎症。
The purpose of this study was to determine whether dexamethasone attenuates the acute increase in macromolecular efflux from the oral mucosa elicited by an aqueous extract of smokeless tobacco (STE) in vivo, and, if so, whether this response is specific. Using intravital microscopy, we found that 20-min suffusion of STE elicited significant, concentration-related leaky site formation and an increase in clearance of fluorescein isothiocyanate-labeled dextran (FITC-dextran; mol mass 70 kDa) from the in situ hamster cheek pouch (P< 0.05). This response was significantly attenuated by dexamethasone (10 mg/kg iv). Dexamethasone also attenuated the bradykinin-induced leaky site formation and the increase in clearance of FITC-dextran from the cheek pouch. However, it had no significant effects on adenosine-induced responses. Dexamethasone had no significant effects on baseline arteriolar diameter and on bradykinin-induced vasodilation in the cheek pouch. Collectively, these data indicate that dexamethasone attenuates, in a specific fashion, the acute increase in macromolecular efflux from the in situ oral mucosa evoked by short-term suffusion of STE. We suggest that corticosteroids mitigate acute oral mucosa inflammation elicited by smokeless tobacco.
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