中华耳鼻咽喉头颈外科杂志
中華耳鼻嚥喉頭頸外科雜誌
중화이비인후두경외과잡지
CHINESE JOURNAL OF OTORHINOLARYNGOLOGY HEAD AND NECK SURGERY
2011年
2期
139-143
,共5页
李建玲%褚汉启%周良强%熊浩%王燕%陈请国%陈金%李志勇%刘云%崔永华
李建玲%褚漢啟%週良彊%熊浩%王燕%陳請國%陳金%李誌勇%劉雲%崔永華
리건령%저한계%주량강%웅호%왕연%진청국%진금%리지용%류운%최영화
老年性聋%KCNQ1钾通道%钠钾氯化物协同转运子%诱发电位,听觉,脑干%小鼠,近交C57BL
老年性聾%KCNQ1鉀通道%鈉鉀氯化物協同轉運子%誘髮電位,聽覺,腦榦%小鼠,近交C57BL
노년성롱%KCNQ1갑통도%납갑록화물협동전운자%유발전위,은각,뇌간%소서,근교C57BL
Presbycusis%KCNQ1 potassium channels%Sodium-potassium-chloride symporters%Evoked potentials,auditory,brain stem%Mice,inbred C57BL
目的 观察钾离子转运蛋白KCNQ1和Na-K-2Cl联合转运子1(Na-K-2Cl co-transporter 1,NKCC1)在C57BL/6J小鼠耳蜗侧壁的年龄相关性表达,探讨这两种转运蛋白在年龄相关性听力减退发病中的作用.方法 通过听性脑干反应(ABR)检测C57BL/6J小鼠各年龄段(4、8、14、24、40周龄)的听力变化.应用免疫组化法确定KCNQ1和NKCC1在C57BL/6J小鼠耳蜗中的表达定位,并检测各年龄段小鼠耳蜗中两种转运蛋白含量随着年龄增加的表达变化.采用反转录聚合酶链反应(RT-PCR)分别检测KCNQ1和NKCC1的mRNA在不同鼠龄小鼠耳蜗中的表达水平.结果 随着C57BL/6J小鼠年龄的增加,其ABR反应阈值逐渐升高,4周龄小鼠的短声(click)和4 kHz、8 kHz的ABR反应阈值与8周龄小鼠相比,差异均无统计学意义(P值均>0.05);14周龄后,三种刺激声的ABR反应阈逐渐升高,与低龄组小鼠相比其差异均具有统计学意义(P值均<0.05).KCNQ1蛋白主要表达于耳蜗血管纹的边缘细胞顶膜,而NKCC1蛋白主要表达于血管纹边缘细胞、螺旋韧带的Ⅱ型纤维细胞及螺旋缘下的纤维细胞.随着年龄的增加,血管纹KCNQ1和NKCC1蛋白的表达逐渐减少.KCNQ1和NKCC1 mRNA的表达量也随着年龄的增加呈现减少的趋势.结论 C57BL/6J小鼠随着年龄的增加其听力逐渐下降.KCNQ1和NKCC1两种钾离子转运蛋白随着小鼠年龄的增加逐渐减少;KCNQ1和NKCC1 mRNA表达水平亦呈现随年龄增加而逐渐减少的趋势.耳蜗侧壁KCNQ1和NKCC1可能在年龄相关性听力减退的发生中起一定作用.
目的 觀察鉀離子轉運蛋白KCNQ1和Na-K-2Cl聯閤轉運子1(Na-K-2Cl co-transporter 1,NKCC1)在C57BL/6J小鼠耳蝸側壁的年齡相關性錶達,探討這兩種轉運蛋白在年齡相關性聽力減退髮病中的作用.方法 通過聽性腦榦反應(ABR)檢測C57BL/6J小鼠各年齡段(4、8、14、24、40週齡)的聽力變化.應用免疫組化法確定KCNQ1和NKCC1在C57BL/6J小鼠耳蝸中的錶達定位,併檢測各年齡段小鼠耳蝸中兩種轉運蛋白含量隨著年齡增加的錶達變化.採用反轉錄聚閤酶鏈反應(RT-PCR)分彆檢測KCNQ1和NKCC1的mRNA在不同鼠齡小鼠耳蝸中的錶達水平.結果 隨著C57BL/6J小鼠年齡的增加,其ABR反應閾值逐漸升高,4週齡小鼠的短聲(click)和4 kHz、8 kHz的ABR反應閾值與8週齡小鼠相比,差異均無統計學意義(P值均>0.05);14週齡後,三種刺激聲的ABR反應閾逐漸升高,與低齡組小鼠相比其差異均具有統計學意義(P值均<0.05).KCNQ1蛋白主要錶達于耳蝸血管紋的邊緣細胞頂膜,而NKCC1蛋白主要錶達于血管紋邊緣細胞、螺鏇韌帶的Ⅱ型纖維細胞及螺鏇緣下的纖維細胞.隨著年齡的增加,血管紋KCNQ1和NKCC1蛋白的錶達逐漸減少.KCNQ1和NKCC1 mRNA的錶達量也隨著年齡的增加呈現減少的趨勢.結論 C57BL/6J小鼠隨著年齡的增加其聽力逐漸下降.KCNQ1和NKCC1兩種鉀離子轉運蛋白隨著小鼠年齡的增加逐漸減少;KCNQ1和NKCC1 mRNA錶達水平亦呈現隨年齡增加而逐漸減少的趨勢.耳蝸側壁KCNQ1和NKCC1可能在年齡相關性聽力減退的髮生中起一定作用.
목적 관찰갑리자전운단백KCNQ1화Na-K-2Cl연합전운자1(Na-K-2Cl co-transporter 1,NKCC1)재C57BL/6J소서이와측벽적년령상관성표체,탐토저량충전운단백재년령상관성은력감퇴발병중적작용.방법 통과은성뇌간반응(ABR)검측C57BL/6J소서각년령단(4、8、14、24、40주령)적은력변화.응용면역조화법학정KCNQ1화NKCC1재C57BL/6J소서이와중적표체정위,병검측각년령단소서이와중량충전운단백함량수착년령증가적표체변화.채용반전록취합매련반응(RT-PCR)분별검측KCNQ1화NKCC1적mRNA재불동서령소서이와중적표체수평.결과 수착C57BL/6J소서년령적증가,기ABR반응역치축점승고,4주령소서적단성(click)화4 kHz、8 kHz적ABR반응역치여8주령소서상비,차이균무통계학의의(P치균>0.05);14주령후,삼충자격성적ABR반응역축점승고,여저령조소서상비기차이균구유통계학의의(P치균<0.05).KCNQ1단백주요표체우이와혈관문적변연세포정막,이NKCC1단백주요표체우혈관문변연세포、라선인대적Ⅱ형섬유세포급라선연하적섬유세포.수착년령적증가,혈관문KCNQ1화NKCC1단백적표체축점감소.KCNQ1화NKCC1 mRNA적표체량야수착년령적증가정현감소적추세.결론 C57BL/6J소서수착년령적증가기은력축점하강.KCNQ1화NKCC1량충갑리자전운단백수착소서년령적증가축점감소;KCNQ1화NKCC1 mRNA표체수평역정현수년령증가이축점감소적추세.이와측벽KCNQ1화NKCC1가능재년령상관성은력감퇴적발생중기일정작용.
Objective To investigate the age-related expression of KCNQ1 and NKCC1 ion transporters in the stria vascularis in the cochlea of C57BL/6J mice, and to analyze the relationship between the two ion transporters and age-related hearing loss. Methods Auditory function of C57BL/6J mice was measured by auditory brainstem response (ABR) at the ages of 4, 8, 14, 24, 40 weeks old respectively.The location of KCNQ1 and NKCC1 ion transporters in the cochlea of C57BL/6J mice was detected by immunohistochemistry staining. Reverse transcription polymerase chain reaction (RT-PCR) was used to detect the levels of KCNQ1 and NKCC1 mRNA in the cochlea of C57BL/6J mice at different ages. Results The mean values for ABR thresholds in response to click, 4 kHz and 8 kHz sound stimulus of C57BL/6J mice gradually increased with age. The ABR thresholds of the mice of over 14 weeks age were significantly elevated in comparison with lower ages (P <0.05). In the lateral wall of C57BL/6J mice cochlea, the KCNQ1 protein was mainly expressed at the apical membrane of the strial marginal cells. The localization of NKCC1 protein was mainly present at the basolateral membrane of the stria marginal cells, spiral ligament and the fibrocytes in the inferior portion of spiral limbus. Expression of KCNQ1 and NKCC1 protein in cochlea of C57BL/6J mice showed age-related decreasing. The level of KCNQ1 and NKCC1 mRNA in cochlea of C57BL/6J also showed a age-related decreasing trend. There was a significant reducing of KCNQ1 mRNA level between C57BL/6J mice of 40 and 4 weeks old (P <0. 05). In comparison with the C57BL/6J mice of 4 weeks old, the NKCC1 mRNA levels of 24 and 40 weeks old also showed significiant reducing (P <0.05). Conclusions The mean value for ABR thresholds of C57BL/6J mice gradually increased with age. Expression of KCNQ1 and NKCC1 protein in the stria vascularis of C57BL/6J mice decreases with age.The levels of KCNQ1 and NKCC1 mRNA in cochlea of C57BL/6J showed a age-related reducing trend.Regulating after post-translation may also participate in the adjusting of the age-related decreasing of KCNQ1and NKCC1 protein in the cochlea of C57BL/6J mice. KCNQ1 and NKCC1 ion transporters may play a critical role in maintaining normal hearing function of inner ear.