JMJD2A sensitizes gastric cancer to chemotherapy by cooperating with CCDC8.

Abstract

BACKGROUND:

Jumonji domain-containing protein 2A (JMJD2A) of the JMJD2 family of histone lysine demethylases has been implicated in tumorigenesis. However, its expression and role in gastric cancer (GC) drug resistance remain unknown. Here, we investigated the role of JMJD2A in GC chemotherapeutic susceptibility and its clinical relevance in GC.

METHODS:

We selected 12 relevant genes from previously identified gene signatures that can predict GC susceptibility to docetaxel, cisplatin, and S-1 (DCS) therapy. Each gene was knocked down using siRNA in GC cell lines, and cell viability assays were performed. JMJD2A expression in GC cell lines and tissues was assessed using qRT-PCR and immunohistochemistry, respectively. A JMJD2A downstream target related to drug susceptibility was examined using whole-gene expression array and immunoprecipitation.

RESULTS:

Among the 12 candidate genes, down-regulation of JMJD2A showed the maximum effect on GC susceptibility to anti-cancer drugs and increased the IC50 values for 5-FU, cisplatin, and docetaxel 15.3-, 2.7-, and 4.0-fold, respectively. JMJD2A was universally expressed in 12 GC cell lines, and its overexpression in GC tissue was positively correlated with tumor regression in 34 DCS-treated patients. A whole-gene expression array of JMJD2A-knockdown GC cells demonstrated a significant decrease in the expression of pro-apoptotic coiled-coil domain containing 8 (CCDC8), a downstream target of JMJD2A. Direct interaction between CCDC8 and JMJD2A was verified using immunoprecipitation. CCDC8 inhibition restored drug resistance to docetaxel, cisplatin, and S-1.

CONCLUSIONS:

Our results indicate that JMJD2A is a novel epigenetic factor affecting GC chemotherapeutic susceptibility, and JMJD2A/CCDC8 is a potential GC therapeutic target.

• Authors: Tadahiko Nakagawa, Yasushi Sato, Toshihito Tanahashi, Yasuhiro Mitsui, Yoshifumi Kida, Yasuteru Fujino, Misato Hirata, Shinji Kitamura, Hiroshi Miyamoto, Koichi Okamoto, Naoki Muguruma, Yoshimi Bando, Tetsuji Takayama
• Journal: Gastric cancer : official journal of the International Gastric Cancer Association and the Japanese Gastric Cancer Association (Gastric Cancer) Vol. 23 Issue 3 Pg. 426-436 (05 2020) ISSN: 1436-3305 [Electronic] Japan
• PMID: 31677131 (Publication Type: Journal Article)

Chemical References

• Biomarkers, Tumor
• CCDC8 protein, human
• Carrier Proteins
• Drug Combinations
• S 1 (combination)
• Tegafur
• Docetaxel
• Oxonic Acid
• Jumonji Domain-Containing Histone Demethylases
• KDM4A protein, human
• Cisplatin

Topics

• Antineoplastic Combined Chemotherapy Protocols (therapeutic use)
• Apoptosis
• Biomarkers, Tumor (metabolism)
• Carrier Proteins (genetics, metabolism)
• Cell Proliferation
• Cisplatin (administration & dosage)
• Docetaxel (administration & dosage)
• Drug Combinations
• Gene Expression Regulation, Neoplastic (drug effects)
• Humans
• Jumonji Domain-Containing Histone Demethylases (genetics, metabolism)
• Oxonic Acid (administration & dosage)
• Prognosis
• Stomach Neoplasms (drug therapy, metabolism, pathology)
• Tegafur (administration & dosage)
• Tumor Cells, Cultured