1
|
Contribution of endoplasmic reticulum stress, MAPK and PI3K/Akt pathways to the apoptotic death induced by a penicillin derivative in melanoma cells. Apoptosis 2021; 27:34-48. [PMID: 34773171 DOI: 10.1007/s10495-021-01697-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/21/2021] [Indexed: 12/21/2022]
Abstract
We have previously examined the in vitro and in vivo antitumor action of TAP7f, a synthetic triazolylpeptidyl penicillin, on murine melanoma cells. In this work, we explored the signal transduction pathways modulated by TAP7f in murine B16-F0 and human A375 melanoma cells, and the contribution of some intracellular signals to the apoptotic cell death. TAP7f decreased ERK1/2 phosphorylation and increased phospho-p38, phospho-JNK and phospho-Akt levels. ERK1/2 blockage suppressed cell growth, while inhibition of p38, JNK and PI3K-I pathways reduced the antitumor effect of TAP7f. Pharmacological inhibition of p38 and JNK, or blockage of PI3K-I/Akt cascade with a dominant negative PI3K-I mutant diminished Bax expression levels and PARP-1 cleavage, indicating the involvement of these pathways in apoptosis. PI3K-I/Akt inhibition also favored an autophagic response, as evidenced by the higher expression levels of Beclin-1 and LC3-II detected in transfected cells exposed to TAP7f. However, although PI3K-I/Akt blockage promoted an autophagic survival response, this mechanism appears not to be critical for TAP7f antitumor action. It was also shown that TAP7f induced ER stress by enhancing the expression of ER stress-related genes and proteins. Downregulation of CHOP protein with specific siRNA increased cell growth and decreased cleavage of PARP-1, supporting its role in apoptosis. Furthermore, it was found that activation of p38, JNK and Akt occurred downstream ER perturbation. In summary, our results showed that TAP7f triggers an apoptotic cell death in melanoma cells through induction of ER stress and activation of p38, JNK and PI3K-I/Akt pathways.
Collapse
|
2
|
Wen J, Hu Y, Liu Q, Ling Y, Zhang S, Luo K, Xie X, Fu J, Yang H. miR-424 coordinates multilayered regulation of cell cycle progression to promote esophageal squamous cell carcinoma cell proliferation. EBioMedicine 2018; 37:110-124. [PMID: 30361064 PMCID: PMC6284509 DOI: 10.1016/j.ebiom.2018.10.043] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/15/2018] [Accepted: 10/15/2018] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Dysregulation of the cell cycle has been implicated in esophageal squamous cell carcinoma (ESCC) progression. This study aimed to evaluate the role of miR-424 in cell cycle regulation and ESCC proliferation. METHODS The role of miR-424 in cell proliferation was evaluated in vitro and in vivo. Transcriptional activation of miR-424 was determined using chromatin immunoprecipitation, and binding of miR-424 to targets was verified using miRNA ribonucleoprotein complex immunoprecipitation. FINDINGS miR-424 was upregulated and correlated with poor survival in ESCC patients. Repression or overexpression of miR-424 respectively decreased or increased ESCC cell proliferation in vitro and in vivo. miR-424 expression is transcriptionally regulated by E2F1 and increased during G1/S transition. Knockdown or overexpression of miR-424 respectively inhibited or promoted both G1/S and G2/M cell cycle transitions in ESCC cells, and these effects were mediated by two newly identified miR-424 targets, PRKCD and WEE1, respectively. Consequently, elevation of PRKCD by miR-424 knockdown led to enhanced stability of the p21Cip1 protein via increased activation of PRKCD and downstream p38 MAPK and JNK signaling to block CDK2 activation and G1/S transition, while elevated WEE1 maintained CDC2 in an inactive state to block G2/M transition. However, circLARP4 could sponge the binding of miR-424 to PRKCD, thus compromising the regulation of G1/S progression by miR-424. INTERPRETATION miR-424 coordinates a previously unknown, multilayered regulation of ESCC cell cycle progression to promote ESCC proliferation, and may be used as a novel prognostic marker and an effective therapeutic target for ESCCs. FUND: National Natural Science Foundation of China.
Collapse
Affiliation(s)
- Jing Wen
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; Guangdong Esophageal Cancer Institute, 651 Dongfeng East Road, Guangzhou 510060, China
| | - Yi Hu
- Guangdong Esophageal Cancer Institute, 651 Dongfeng East Road, Guangzhou 510060, China; Department of Thoracic Oncology, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China
| | - Qianwen Liu
- Guangdong Esophageal Cancer Institute, 651 Dongfeng East Road, Guangzhou 510060, China; Department of Thoracic Oncology, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China
| | - Yihong Ling
- Department of Pathology, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China
| | - Shuishen Zhang
- Department of Thoracic Surgery, The First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Second Road, Guangzhou 510080, China
| | - Kongjia Luo
- Guangdong Esophageal Cancer Institute, 651 Dongfeng East Road, Guangzhou 510060, China; Department of Thoracic Oncology, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China
| | - Xiuying Xie
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; Guangdong Esophageal Cancer Institute, 651 Dongfeng East Road, Guangzhou 510060, China
| | - Jianhua Fu
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; Guangdong Esophageal Cancer Institute, 651 Dongfeng East Road, Guangzhou 510060, China; Department of Thoracic Oncology, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China
| | - Hong Yang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China; Guangdong Esophageal Cancer Institute, 651 Dongfeng East Road, Guangzhou 510060, China; Department of Thoracic Oncology, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China.
| |
Collapse
|
3
|
Reyland ME, Jones DNM. Multifunctional roles of PKCδ: Opportunities for targeted therapy in human disease. Pharmacol Ther 2016; 165:1-13. [PMID: 27179744 DOI: 10.1016/j.pharmthera.2016.05.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The serine-threonine protein kinase, protein kinase C-δ (PKCδ), is emerging as a bi-functional regulator of cell death and proliferation. Studies in PKCδ-/- mice have confirmed a pro-apoptotic role for this kinase in response to DNA damage and a tumor promoter role in some oncogenic contexts. In non-transformed cells, inhibition of PKCδ suppresses the release of cytochrome c and caspase activation, indicating a function upstream of apoptotic pathways. Data from PKCδ-/- mice demonstrate a role for PKCδ in the execution of DNA damage-induced and physiologic apoptosis. This has led to the important finding that inhibitors of PKCδ can be used therapeutically to reduce irradiation and chemotherapy-induced toxicity. By contrast, PKCδ is a tumor promoter in mouse models of mammary gland and lung cancer, and increased PKCδ expression is a negative prognostic indicator in Her2+ and other subtypes of human breast cancer. Understanding how these distinct functions of PKCδ are regulated is critical for the design of therapeutics to target this pathway. This review will discuss what is currently known about biological roles of PKCδ and prospects for targeting PKCδ in human disease.
Collapse
Affiliation(s)
- Mary E Reyland
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
| | - David N M Jones
- Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| |
Collapse
|