Differential expression of Ran-binding protein 2 (RanBP2) and Targeting Protein for Xklp2 (TPX2) in head and neck squamous cell carcinoma cells

Authors

  • Ekarat Hitakomate Faculty of Dentistry, Thammasat University
  • Sittichai Koontongkaew

DOI:

https://doi.org/10.14456/gag.2019.7

Keywords:

Head and neck cancer; RanGTPase; RanBP2; TPX2

Abstract

RanGTPase is overexpressed in various human cancer cell lines. RanGTPase-related genes are essential for viability of head and neck cancer cell lines. However, it is currently unclear whether RanGTPase may play a role in metastasis of head and neck cancer. This study aimed to examine mRNA and protein expression of RanGTPase in primary and metastatic head and neck cancer cell lines using real-time PCR and Western blot. Three pairs of head and neck cancer cell lines were used. HN18 HN30, HN4 were derived from primary lesions whereas HN17 HN31, HN12 were derived from metastasis lesions which belong to same patients, respectively. They were compared to HaCat which is an immortalized non-tumorigenic human keratinocyte cell line. Cells were cultured and total RNA was extracted and converted to complementary DNA. mRNA expression of Ran, KPNB1, RanBP2, and TPX2 was monitored using real-time PCR. GAPDH was used as an internal control. Western blots were also performed to examine protein expression of Ran, Importin-beta, RanBP2 and TPX2. Realtime PCR data showed that mRNA expression of Ran, KPNB1, RanBP2 and TPX2 in primary and metastatic head and neck cancer cell lines was significantly different from that of HaCat at p value of 0.0079, 0.0005, 0.0074 and 0.0039, respectively. Furthermore, expression of mRNA transcript of Ran and TPX2 in metastatic head and neck cancer cell lines was higher than that of primary cancer cells. However, protein expression of RanBP2 and TPX2 was found to be higher in metastatic cancer cells compared to their primary counterparts. These findings suggest that expression of mRNA transcripts and protein of RanGTPase network was significantly different from that of normal cells. Particularly, RanBP2, and TPX2 expression was elevated in metastatic head and neck cancer cell lines. Further studies are required to understand its functional role in metastatic head and neck cancer.

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Published

2019-12-14

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Research Articles