[The influence of protein kinase C inhibitor in eosinophil apoptosis of nasal polyps].

OBJECTIVE

To study the influence of the inhibitor of protein kinase C (PKC), Iso-H7 [1-(5-lsoquinolinyl-sulfony)-3-methylpiperazine dihydrochloride] on eosinophil apoptosis in nasal polyp tissues.

METHODS

Nasal polyp tissues were cultured and divided into two groups, test group (with Iso-H7 in different concentration) and control group (without the inhibitor of PKC), to check out the influence of Iso-H7 on eosinophil apoptosis in nasal polyps. The nasal polyp tissues were cultured in Iso-H7 in concentration of 10(-6), 10(-4), 10(-2) mol/L for 1 d, 3 d, and 5 d, respectively. Eosinophil apoptosis index was measured with TUNEL (terminal-deoxynucleotidyl transferase d-UTP nick end labeling), in situ hybridization and MGG staining to identify eosinophil apoptosis.

RESULTS

Occasionally, there was little eosinophil apoptosis in two groups in 1 d, but in 3 d, There were a great deal of eosinophil apoptosis in test group. The eosinophil apoptosis indexs of the two groups were significantly different (P < 0.01). The indexs of eosinophil apoptosis was not significantly higher in 3 d than that in 5 d in test groups (P > 0. 05), but significantly higher than that in 1d (P < 0. 01).

CONCLUSIONS

Iso-H7 takes a important role in accelerating eosinophil apoptosis. The inhibitor of PKC could significantly promote eosinophil apoptosis in nasal polyps. There is no dosage and time dependence of PKC inhibitor in regulating eosinophil apoptosis of nasal polyps.