PMID- 27192907 OWN - NLM STAT- MEDLINE DCOM- 20160706 LR - 20190221 IS - 2096-7993 (Print) IS - 2096-7993 (Linking) VI - 30 IP - 2 DP - 2016 Jan TI - [Expression and significance of p-Stat3 and its downstream gene c-myc in laryngeal squamous cell carcinoma tissue and cell line]. PG - 123-5, 129 AB - OBJECTIVE: To detect the expressions of p-Stat3 and c-myc in human laryngeal squamous cell carcinoma (LSCC) tissue and Hep2 cell line, and to find the relationship between them. METHOD: Immunohistochemistry was used to detect the expressions of p-Stat3 and c-myc in 60 cases of LSCC and 30 cases of vocal cord polyp tissue. The protein levels of p-Stat3 and c-myc in Hep2 cell line was determined by immunocytochemistry. Western blotting was used to determine the protein levels of p-Stat3 and c-myc in Hep2 after treating with different concentrations of Stattic. RESULT: The positive rates of p-Stat3 and c-myc were 65% and 70% in the LSCC tissue, compared with that in the vocal cord polyp tissue, with significant difference (P < 0.05). The expression of p-Stat3 in LSCC tissue was associated with that of c-myc (r = 0.273, P < 0.05). The protein levels of p-Stat3 and c-myc were detected in the Hep2 cell line. Stattic inhibited Stat3 phosphorylation and c-myc in the Hep2 cell line in a concentration-dependent manner. CONCLUSION: p-Stat and c-myc were up regulated in the tissue of laryngeal squamous cell carcinoma and the Hep2 cell line. Stattic inhibits the constitutively active p-Stat3 signaling pathway, and downregulats the expression of c-myc. The strong constitutive p-Stat3 signaling pathway in LSCC makes p-Stat3 a target for the development of novel therapeutic strategies. FAU - Liu, Li AU - Liu L FAU - Wang, Ying AU - Wang Y FAU - Sang, Jianzhong AU - Sang J LA - chi PT - Journal Article PL - China TA - Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi JT - Lin chuang er bi yan hou tou jing wai ke za zhi = Journal of clinical otorhinolaryngology, head, and neck surgery JID - 101303164 RN - 0 (MYC protein, human) RN - 0 (Proto-Oncogene Proteins c-myc) RN - 0 (STAT3 Transcription Factor) RN - 0 (STAT3 protein, human) SB - IM MH - Carcinoma, Squamous Cell/*metabolism/pathology MH - Cell Line, Tumor MH - Head and Neck Neoplasms/*metabolism/pathology MH - Humans MH - Immunohistochemistry MH - Laryngeal Neoplasms/*metabolism/pathology MH - Phosphorylation MH - Proto-Oncogene Proteins c-myc/*metabolism MH - STAT3 Transcription Factor/*metabolism MH - Signal Transduction MH - Squamous Cell Carcinoma of Head and Neck EDAT- 2016/05/20 06:00 MHDA- 2016/07/07 06:00 CRDT- 2016/05/20 06:00 PHST- 2016/05/20 06:00 [entrez] PHST- 2016/05/20 06:00 [pubmed] PHST- 2016/07/07 06:00 [medline] PST - ppublish SO - Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi. 2016 Jan;30(2):123-5, 129.