成纤维细胞生长因子耳蜗内灌注防治爆震性聋的实验研究

Treatment effects of fibroblast growth factors on blastinduced hearing loss

选用豚鼠１９只，震前于圆窗龛放银球电极测复合动作电位（ＣＡＰ）反应阈，爆震后测ＣＡＰ，于耳蜗底回打孔，分别灌注酸性成纤维细胞生长因子（ａＦＧＦ）和碱性成纤维细胞生长因子（ｂＦＧＦ），４８小时后再测ＣＡＰ，处死动物做耳蜗琥珀酸脱氢酶（ＳＤＨ）组化染色铺片。结果爆震后灌注ｂＦＧＦ、ａＦＧＦ两组动物４８小时ＣＡＰ平均阈值分别为８８．７ｄＢ和９３．２ｄＢ，而单纯打孔组和灌注外淋巴组ＣＡＰ平均阈值分别为１１９．４ｄＢ和１０７．５ｄＢ，差异有显著性（Ｐ＜０．０５和０．０１）。铺片结果示灌流生长因子两组动物耳蜗毛细胞损伤程度比其他两组要轻。结果提示ｂＦＧＦ、ａＦＧＦ耳蜗内灌注对爆震性聋ＣＡＰ反应阈恢复有促进作用，在耳蜗声损伤过程中有保护和修复功用。

Nineteen guinea pigs were chosen to measure the compound action potential (CAP) using the silverball electrode before and after explosion and 48 h after perfusion of acidic fibroblast growth factor (aFGF) and basic fibroblast growth factor (bFGF). After explosion the average CAP thresholds in the group perfused with bFGF and aFGF were 88.7 dB and 93.2 dB SPL respectivery, the CAP threshold in the control group was 119.4 dB SPL. The difference was significant. The results of the hair cell count from the surface preparation of the cochlea showed that hair cell damage in the control group was more severe than that in the group perfused with aFGF and bFGF. It suggests that aFGF and bFGF perfused to the cochlea may facilitate recovery processes of hearing loss and help to repair the hair cell following acoustic trauma.