Regulation of oncogenes and gap junction intercellular communication during the proliferative response of zearalenone in TM3 cells

2016 ◽  
Vol 36 (7) ◽  
pp. 701-708 ◽  
Author(s):  
W Zheng ◽  
Q Huang ◽  
S Pan ◽  
W Fan ◽  
G Wang ◽  
...  
Keyword(s):  
Gap Junction ◽  
Intercellular Communication ◽  
Dynamic Balance ◽  
Fusarium Species ◽  
Control Group ◽  
Dependent Manner ◽  
Protein Levels ◽  
Tensin Homolog ◽  
Gap Junction Intercellular Communication ◽  
Study Results

Zearalenone (ZEA) is a nonsteroidal estrogenic mycotoxin produced by Fusarium species. The exposure risk to humans and animals is the consumption of contaminated food and animal feeds. The aim of this study was to investigate ZEA-induced effects and its tumorigenic mechanism in TM3 cells (mouse Leydig cells). Cell proliferation, apoptosis, and gap junction intercellular communication (GJIC) were assessed in this study. Results showed that low concentrations of ZEA could significantly promote the growth of TM3 cells. The percentage of cell distribution was decreased significantly in G1/G0 phase and was increased significantly in S phase with 10 and 20 μg/L of ZEA for 72 h ( p < 0.05, p < 0.01). The expressions of cyclin D1 and Cdk4 were significantly increased in the exposure groups compared with the control group ( p < 0.05, p < 0.01). Compared with the control group, the apoptosis was significantly decreased in 10 and 20 μg/L groups ( p < 0.01), and the ratio of Bax/Bcl-2 protein level was significantly decreased in a dose-dependent manner. The protein levels of proto-oncogene c-Myc, c-Jun, and c-Fos were significantly elevated and the protein levels of anti-oncogene p53 and phosphatase and tensin homolog (PTEN) were decreased obviously compared with the control group ( p < 0.05, p < 0.01). ZEA affected the expressions of connexins and inhibited the activity of GJIC. These results demonstrated that ZEA can disturb the dynamic balance between proliferation and apoptosis and causes abnormal regulation of oncogenes, GJIC, and connexins in TM3 cells, which may easily induce the translation of normal cells into tumor cells.

scholarly journals Gap Junction Intercellular Communication Positively Regulates Cisplatin Toxicity by Inducing DNA Damage through Bystander Signaling

Cancers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 368 ◽  
Author(s):  
Sanjeevani Arora ◽  
Joshua Heyza ◽  
Elaine Chalfin ◽  
Randall Ruch ◽  
Steve Patrick
Keyword(s):  
Gap Junction ◽  
Intercellular Communication ◽  
Connexin 43 ◽  
Bystander Effect ◽  
Cisplatin Resistance ◽  
Dependent Manner ◽  
Dna Double Strand Breaks ◽  
Cellular Density ◽  
Gap Junction Intercellular Communication ◽  
Radiation Induced Bystander Effect

The radiation-induced bystander effect (RIBE) can increase cellular toxicity in a gap junction dependent manner in unirradiated bystander cells. Recent reports have suggested that cisplatin toxicity can also be mediated by functional gap junction intercellular communication (GJIC). In this study using lung and ovarian cancer cell lines, we showed that cisplatin cytotoxicity is mediated by cellular density. This effect is ablated when GJA1 or Connexin 43 (Cx43) is targeted, a gap junction gene and protein, respectively, leading to cisplatin resistance but only at high or gap junction forming density. We also observed that the cisplatin-mediated bystander effect was elicited as DNA Double Strand Breaks (DSBs) with positive H2AX Ser139 phosphorylation (γH2AX) formation, an indicator of DNA DSBs. These DSBs are not observed when gap junction formation is prevented. We next showed that cisplatin is not the “death” signal traversing the gap junctions by utilizing the cisplatin-GG intrastrand adduct specific antibody. Finally, we also showed that cells deficient in the structure-specific DNA endonuclease ERCC1-ERCC4 (ERCC1-XPF), an important mediator of cisplatin resistance, further sensitized when treated with cisplatin in the presence of gap junction forming density. Taken together, these results demonstrate the positive effect of GJIC on increasing cisplatin cytotoxicity.

Connexin expression by alveolar epithelial cells is regulated by extracellular matrix

2001 ◽  
Vol 280 (2) ◽  
pp. L191-L202 ◽  
Author(s):  
Yihe Guo ◽  
Cara Martinez-Williams ◽  
Clare E. Yellowley ◽  
Henry J. Donahue ◽  
D. Eugene Rannels
Keyword(s):  
Extracellular Matrix ◽  
Epithelial Cells ◽  
Gap Junction ◽  
Intercellular Communication ◽  
Translational Regulation ◽  
Alveolar Epithelial Cells ◽  
Alveolar Type ◽  
Type Ii ◽  
Gap Junction Intercellular Communication ◽  
Type Ii Cell

Extracellular matrix (ECM) proteins promote attachment, spreading, and differentiation of cultured alveolar type II epithelial cells. The present studies address the hypothesis that the ECM also regulates expression and function of gap junction proteins, connexins, in this cell population. Expression of cellular fibronectin and connexin (Cx) 43 increase in parallel during early type II cell culture as Cx26 expression declines. Gap junction intercellular communication is established over the same interval. Cells plated on a preformed, type II cell-derived, fibronectin-rich ECM demonstrate accelerated formation of gap junction plaques and elevated gap junction intercellular communication. These effects are blocked by antibodies against fibronectin, which cause redistribution of Cx43 protein from the plasma membrane to the cytoplasm. Conversely, cells cultured on a laminin-rich ECM, Matrigel, express low levels of Cx43 but high levels of Cx26, reflecting both transcriptional and translational regulation. Cx26 and Cx43 thus demonstrate reciprocal regulation by ECM constituents.

scholarly journals Simvastatin protects Sertoli cells against cisplatin cytotoxicity through enhanced gap junction intercellular communication

2015 ◽  
Vol 34 (4) ◽  
pp. 2133-2141 ◽  
Author(s):  
LINGZHI WANG ◽  
JIANXIN PENG ◽  
HUANSEN HUANG ◽  
QIN WANG ◽  
MEILING YU ◽  
...  
Keyword(s):  
Gap Junction ◽  
Intercellular Communication ◽  
Sertoli Cells ◽  
Gap Junction Intercellular Communication

The Warburg effect promoted the activation of the NLRP3 inflammasome induced by Ni-refining fumes in BEAS-2B cells

2020 ◽  
Vol 36 (8) ◽  
pp. 580-590
Author(s):  
Rui Wang ◽  
Sheng-Yuan Wang ◽  
Yue Wang ◽  
Rui Xin ◽  
Bing Xia ◽  
...  
Keyword(s):  
Nlrp3 Inflammasome ◽  
Warburg Effect ◽  
Hypoxia Inducible Factor ◽  
Lactate Production ◽  
Control Group ◽  
Dependent Manner ◽  
Chain Reactions ◽  
Protein Levels ◽  
Polymerase Chain Reactions ◽  
The Warburg Effect

Nickel (Ni) is a known human carcinogen that has an adverse effect on various human organs in occupational workers during Ni refinement and smelting. In the present study, we used real-time polymerase chain reactions, Western blot analysis, and a lactate production assay to investigate whether an increase in the NLRP3 inflammasome induced by Ni-refining fumes was associated with the Warburg effect in BEAS-2B cells, a nonmalignant pulmonary epithelial line. Exposure to Ni-refining fumes suppressed cell proliferation and increased lactate production compared with those in an untreated control group in a dose- and time-dependent manner. Ni-refining fumes induced the Warburg effect, which was observed based on increases in the levels of hypoxia-inducible factor-1α, hexokinase 2, pyruvate kinase isozyme type M2, and lactate dehydrogenase A. In addition, Ni-refining fumes promoted increased expression of NLRP3 at both the gene and protein levels. Furthermore, inhibition of the Warburg effect by 2-Deoxy-d-glucose reversed the increased expression of NLRP3 induced by Ni-refining fumes. Collectively, our data demonstrated that the Warburg effect can promote the expression of the NLRP3 inflammasome induced by the Ni-refining fumes in BEAS-2B cells. This indicates a new phenomenon in which alterations in energy production in human cells induced by Ni-refining fumes regulate the inflammatory response.

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