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Zhang Z, Li Y, Huang L, Xiao Q, Chen X, Zhong J, Chen Y, Yang D, Han Z, Shu Y, Dai M, Cao K. Let-7a suppresses macrophage infiltrations and malignant phenotype of Ewing sarcoma via STAT3/NF-κB positive regulatory circuit. Cancer Lett 2016; 374:192-201. [PMID: 26902422 DOI: 10.1016/j.canlet.2016.02.027] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 02/13/2016] [Accepted: 02/16/2016] [Indexed: 12/17/2022]
Abstract
The interaction between tumors cells, tumor-derived humoral factors and the bone marrow in the bone niches has been shown to be essential for bone tumor initiation and promotion. Among the tumor stromal cells, tumor-associated macrophages (TAMs) are usually the most abundant immune population. Previously, we reported that let-7a functions as a tumor suppressor in ES. Herein, we found that the suppressive effects are not only limited on the malignant phenotype of tumor cells but also on the regulation of macrophage infiltration. We observed that the let-7a expression is negatively related to macrophage infiltrations in ES. Moreover, overexpression of putative ts-miRNA let-7a significantly suppressed the recruitment of PBMCs in vitro and decreased the macrophage infiltrations in ES-xenografted tumors in vivo. Most importantly, a positive regulatory feedback loop consisting of let-7a, signal transducer and activator of transcription 3 (STAT3), and nuclear factor-kappa B (NF-κB) (let-7a/STAT3/NF-κB) was involved in let-7a-mediated suppressive effects. These data might provide evidence of a novel intracellular signaling network function in ES pathogenesis, and manipulating this novel feedback loop will have therapeutic potential for ES patients.
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Affiliation(s)
- Zhongzu Zhang
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China; Department of Orthopedics, The Yongchuan Affiliated Hospital of Chongqing Medical University, Chongqing 402160, China
| | - Yunyun Li
- Department of Gynecology and Obstetrics, The Yongchuan Affiliated Hospital of Chongqing Medical University, Chongqing 402160, China
| | - Lu Huang
- Department of Children Health and Care, Jiangxi Maternal and Child Health Hospital, Nanchang, Jiangxi 330006, China
| | - Qianren Xiao
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China
| | - Xiang Chen
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China
| | - Junlong Zhong
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China
| | - Yiwei Chen
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China
| | - Dong Yang
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China
| | - Zhimin Han
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China
| | - Yong Shu
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China
| | - Min Dai
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China
| | - Kai Cao
- Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China.
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LPLUNC1 suppresses IL-6-induced nasopharyngeal carcinoma cell proliferation via inhibiting the Stat3 activation. Oncogene 2013; 33:2098-109. [PMID: 23708661 DOI: 10.1038/onc.2013.161] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 03/02/2013] [Accepted: 03/14/2013] [Indexed: 12/28/2022]
Abstract
Tumor-associated macrophage (TAM)-related chronic inflammation and interleukin-6 (IL-6) contribute to the progression of nasopharyngeal carcinoma (NPC). In this study, we characterized TAMs and IL-6 expression in 212 biopsied NPC and 119 non-tumor nasopharyngeal epithelium (NPE) tissues by tissue array. In comparison with that in the NPE tissues, more TAM infiltrates and a higher density of IL-6 expression were detected in NPC tissues, which were associated with the poor survival of NPC patients. In contrast, little or no LPLUNC1, a regulator of inflammation, expression was detected in NPC tissues, and the levels of LPLUNC1 expression in the NPC were associated negatively with the numbers of TAMs and the levels of IL-6 expression, but positively with the survival of NPC patients. Induction of LPLUNC1 overexpression in NPC cells mitigated lipopolysaccharide (LPS)-induced IL-6, IL-8, tumor necrosis factor-α and IL-1β expression or treatment of THP-1 macrophages with LPLUNC1 inhibited spontaneous and LPS-induced IL-6 expression in vitro. IL-6-promoted NPC cell proliferation in a dose- and time-dependent manner, accompanied by increasing cyclin D1 and Bcl-2 expression and the Stat3 activation, but inhibiting Bax and p21 expression. Induction of LPLUNC1 overexpression inhibited NPC cell proliferation, induced NPC cell arrest, promoted NPC cell apoptosis even after IL-6 stimulation and inhibited the growth of implanted NPC tumors in vivo, which were associated with decreasing cyclin D1 and Bcl-2 expression and the Janus kinase 2 (JAK2)/Stat3 activation, but enhancing Bax and p21 expression. These results suggest that LPLUNC1 can inhibit inflammation and NPC growth by downregulating the Stat3 pathway.
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