Effects of bleomycin A5 on caspase-3, P53, bcl-2 expression and telomerase activity in vascular endothelial cells.

OBJECTIVE: The aim of this study was to investigate the molecular mechanism of bleomycin A5 in inducing the apoptosis of human umbilical vein endothelial cells (ECV304). MATERIALS AND METHODS: ECV304 cells were cultured and passaged, and then were divided into control group and three treatment groups. The later three groups were treated with 15, 75, and 150 µg/ml bleomycin A5 for 24 hours, respectively. The expressions of caspase-3, p53, and bcl-2 in ECV304 cells were detected by flow cytometry, and the activity of telomerase was determined using telomere repeat amplification protocol (TRAP)-silver staining method. RESULTS: After treatment with different concentrations of bleomycin A5, the expression of caspase-3 in ECV304 cells was increased. It was significantly decreased with the increase of bleomycin A5 concentration, but the difference between 75 µg/ml and 150 µg/ml groups was not significant. Bleomycin A5 could significantly increase the expression of p53, with concentration dependence. It had no obvious effect on bcl-2 expression. There was high expression of telomerase in control group. After treatment with different concentration of bleomycin A5, the telomerase activity was significantly decreased. CONCLUSION: Bleomycin A5 can increase caspase-3 and p53 levels and inhibit telomerase activity to induce ECV304 apoptosis.

[Glottic measurement and vocal evaluation after three surgical techniques in the treatment of bilateral vocal cord paralysis].

OBJECTIVE: To evaluate postoperative glottic area and vocal quality of three various surgical techniques for treating bilateral vocal cord paralysis, including laser arytenoidectomy (Group A, 24 cases), reinnervation of the posterior cricoarytenoid muscle by phrenic nerve (Group B, 9 cases) and arytenoidectomy accompanying lateral cordopexy by extralaryngeal approach (Woodman's procedure, Group C, 13 cases). METHODS: 46 cases suffered from bilateral recurrent laryngeal nerve injury were included in our study. The pre-postoperative glottic measurement and vocal acoustic parameters were analyzed. RESULTS: The decannulated cases in group A and group B and group C were 22, 8, 13 respectively. The post-operative mean maximal glottic area was (47.2 +/- 7.4) mm2, (78.3 +/- 16.0) mm2, (48.1 +/- 6.5) mm2 respectively. Group B cases glottic area was larger than that of group A and group C (t value were 4.46 and 3.85, P value were 0.000 and 0.001). No significant difference was found between group A and group C (t = 1.68, P = 0.101). After surgery, in group A, 17 cases voice quality was the same compared with that of before surgery, and 7 cases voice quality had become worse; In group B, the voice quality had become better in 5 cases, completely recovered in 1 case, and had not change in 3 cases; In group C, the voice quality had become deteriorated in 10 cases and no change in 3 cases. And in group B, ipsilateral diaphragm paralysis in 9 cases after surgery, whose vital capacity and forced vital capacity had decreased to 72%-84%, 76%-84% of that before the surgery respectively; and the diaphragm mobility had recovered by 35%-76% respectively, while vital capacity and forced vital capacity had become 93%-97%, 91%-98% of that before the surgery. In Group B, all cases' pulmonary function was normal half a year postoperatively. CONCLUSIONS: Reinnervation of the posterior cricoarytenoid muscle by phrenic nerve seems to be best procedure with better post-operative voice and larger glottic area. Although the sufficient airway for decannulation can be acquired in Group A and Group C, but most of patients in Group A had pre-operative vocal level and badly abnormal in Group C.

[Intratumor bleomycin-A5 injection under electrolaryngoscope for treatment of large laryngopharyngeal and laryngeal hemangioma].

OBJECTIVE: To study the therapeutic effect of bleomycin-A5 injection under eletrolaryngoscope for treatment of large laryngopharyngeal and laryngeal hemangioma. METHODS: Intratumor bleomycin-A5 injection under eletrolaryngoscope was performed in 18 cases of large laryngopharyngeal and laryngeal hemangioma with surface anaesthesia, for totally 7 to 14 (mean 10.2) injections in each case. RESULTS: Twelve patients were cured and 6 showed obvious improvement. Follow-up of the patients for over one year found no recurrence of the hemangioma. CONCLUSION: Bleomycin-A5 injection is a minimal invasive procedure for treatment of large laryngopharyngeal and laryngeal hemangioma, causing less pain and better preserving the laryngeal function without the necessity of tracheotomy.