The effects of serum of patients with Kawasaki disease on the platelet derived growth factor-B (PDGF-B) chain protein expression in monocytes were studied by immunocytochemical method and the effects of the serum on the endothelial cellular (EC) apoptosis were observed by flow cytometric technique. It was found that the serum of patients with Kawasaki disease induced significantly the expression of PDGF-B chain protein. Likewise, EC apoptosis was increased significantly in the experimental group as compared with the control group (P<0. 01). The results suggest that PDGF in monocytes increase and EC apoptosis play an important role in the development of coronary artery complication in Kawasaki disease.

To understand the relationship between expression of P53 protein and HPV16/18 infection in laryngeal papillomas, PCR and immunohistochemical techniques were used to examine the paraffin-embedded tissue samples of laryngeal papillomas from 35 subjects. HPV 16/18-DNA was found in 24 cases of laryngeal papillomas (68. 8 %). Overexpression of P53 protein was detected in 19 cases (54. 3 %). Both HPV16/18-DNA and overexpression of P53 protein Were demonstrated in 12 cases of laryngeal papillomas (34. 3 %). Our results suggest that HPV16/18 infection and P53 gene mutation are associated with pathogenesis of laryngeal papillomas. The relation between HPV infection and P53 mutation in tissues of laryngeal papillomas remains to be clarified.