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Malvi P, Chaube B, Singh SV, Mohammad N, Pandey V, Vijayakumar MV, Radhakrishnan RM, Vanuopadath M, Nair SS, Nair BG, Bhat MK. Weight control interventions improve therapeutic efficacy of dacarbazine in melanoma by reversing obesity-induced drug resistance. Cancer Metab 2016; 4:21. [PMID: 27980732 PMCID: PMC5142287 DOI: 10.1186/s40170-016-0162-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Accepted: 11/23/2016] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Obesity-related cellular, metabolic, and molecular alterations have been shown to increase cancer risk and tumor progression and are associated with poorer therapeutic outcome in cancer patients. However, the impact of obesity and weight-control interventions on the therapeutic response in melanoma is poorly understood. METHODS High fat diet (HFD)-induced obese mouse model was used in this study to evaluate the outcome of dacarbazine (DTIC) therapy in melanoma. We employed LC-MS/MS to determine the quantity of the drug in tumor, and in various tissues. Unique in vitro approach was used to complement in vivo findings by culturing melanoma cells in either conditioned medium (CM) obtained from differentiated adipocytes or in serum collected from experimental mice. RESULTS We report that diet-induced obesity impairs the outcome of DTIC therapy and reduces overall survival in tumor-bearing mice. We provide evidence that obesity restricts the accessibility of DTIC to tumor tissue. Critically, upon curtailing adiposity, accumulation and efficacy of DTIC is significantly improved. Moreover, using appropriate in vitro approaches, we show that melanoma cells exhibit a drug-resistant phenotype when cultured in serum collected from diet-induced obese mice or in CM collected from 3T3-L1 adipocytes. The impaired therapeutic response to DTIC in obese state is mediated by fatty acid synthase (FASN), caveolin-1 (Cav-1), and P-glycoprotein (P-gp). The response to DTIC and overall survival were improved upon employing weight control interventions in the tumor-bearing HFD-fed (obese) mice. CONCLUSIONS This study indicates that obesity not only supports rapid melanoma progression but also impairs the outcome of chemotherapy, which can be improved upon employing weight control interventions. From clinically relevant point of view, our study exemplifies the importance of lifestyle interventions in the treatment of obesity-promoted cancers.
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Affiliation(s)
- Parmanand Malvi
- Laboratory No. 6, National Centre for Cell Science (NCCS), Savitribai Phule Pune University Campus, Ganeshkhind, Pune, 411 007 India
| | - Balkrishna Chaube
- Laboratory No. 6, National Centre for Cell Science (NCCS), Savitribai Phule Pune University Campus, Ganeshkhind, Pune, 411 007 India
| | - Shivendra Vikram Singh
- Laboratory No. 6, National Centre for Cell Science (NCCS), Savitribai Phule Pune University Campus, Ganeshkhind, Pune, 411 007 India
| | - Naoshad Mohammad
- Laboratory No. 6, National Centre for Cell Science (NCCS), Savitribai Phule Pune University Campus, Ganeshkhind, Pune, 411 007 India
| | - Vimal Pandey
- Laboratory No. 6, National Centre for Cell Science (NCCS), Savitribai Phule Pune University Campus, Ganeshkhind, Pune, 411 007 India ; Present address: Laboratory of Neuroscience, Department of Biotechnology and Bioinformatics, Hyderabad Central University, Hyderabad, 500 046 India
| | - Maleppillil Vavachan Vijayakumar
- Laboratory No. 6, National Centre for Cell Science (NCCS), Savitribai Phule Pune University Campus, Ganeshkhind, Pune, 411 007 India
| | | | - Muralidharan Vanuopadath
- Amrita School of Biotechnology, Amrita Vishwa Vidyapeetham, Clappana P.O., Kollam, 690 525 India
| | - Sudarslal Sadasivan Nair
- Amrita School of Biotechnology, Amrita Vishwa Vidyapeetham, Clappana P.O., Kollam, 690 525 India
| | | | - Manoj Kumar Bhat
- Laboratory No. 6, National Centre for Cell Science (NCCS), Savitribai Phule Pune University Campus, Ganeshkhind, Pune, 411 007 India
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Hashimoto Y, Matsuzaki E, Higashi K, Takahashi-Yanaga F, Takano A, Hirata M, Nishimura F. Sphingosine-1-phosphate inhibits differentiation of C3H10T1/2 cells into adipocyte. Mol Cell Biochem 2014; 401:39-47. [PMID: 25445169 DOI: 10.1007/s11010-014-2290-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Accepted: 11/26/2014] [Indexed: 02/08/2023]
Abstract
Mesenchymal stem cells (MSCs) can differentiate into a number of cell types, including adipocytes and osteoblasts. MSC differentiation into adipocytes inhibits osteogenic differentiation and vice versa. Therefore, understanding the mechanisms of MSC differentiation at the signaling level can lead to the development of novel therapeutic strategies toward tissue regeneration. Sphingosine-1-phosphate (S1P) is a signaling molecule that regulates many cellular responses, including cellular differentiation. However, the effects of S1P on MSC differentiation are largely unknown. The purpose of study was to investigate whether S1P drives MSCs toward either adipogenic or osteogenic differentiation, and if so, to clarify the underlying signaling mechanisms for such differentiation. We found that S1P inhibited adipogenic differentiation of C3H10T1/2 multipotent stem cells, while promoting their osteogenic differentiation. During adipogenic differentiation, S1P suppressed the cAMP accumulation in a Gi-protein-dependent manner. The Gi-dependent S1P signaling suppressed C/EBPβ expression, which is essential for adipogenic differentiation. Furthermore, S1P did not affect cAMP-independent adipogenic differentiation. These findings suggest that S1P suppresses cAMP accumulation, leading to inhibition of C/EBPβ expression, thereby resulting in decreased adipogenic differentiation of C3H10T1/2 cells. Thus, our findings provide novel molecular mechanisms as regards how S1P inhibits adipogenic differentiation of C3H10T1/2 cells, indicating a potential beneficial role for regeneration and repair of tissues.
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Affiliation(s)
- Yoko Hashimoto
- Periodontal Section, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
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Wang DC, Chen KY, Tsai CH, Chen GY, Chen CH. AFM membrane roughness as a probe to identify oxidative stress-induced cellular apoptosis. J Biomech 2011; 44:2790-4. [PMID: 21937047 DOI: 10.1016/j.jbiomech.2011.08.021] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Revised: 08/21/2011] [Accepted: 08/29/2011] [Indexed: 10/17/2022]
Abstract
The morphological change of cellular apoptosis initiates from the change of membrane roughness. In order to identify cellular apoptosis in its early stage, atomic force microscope was adapted to reveal the change of membrane roughness in unprecedented details, providing an image in nanometer-scaled resolution. The mouse monocyte/macrophage cell line RAW 264.7 was the subject studied and subjected to apoptotic induction by hydrogen peroxide. A finding of the qualitative correlation between cell membrane roughness and oxidative stress level is disclosed stating that roughness is increasing with the increasing level of oxidative stress.
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Affiliation(s)
- Dau-Chung Wang
- Department of Mechanical Engineering, National Yunlin University of Science and Technology, Taiwan.
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Vijayakumar MV, Pandey V, Mishra GC, Bhat MK. Hypolipidemic effect of fenugreek seeds is mediated through inhibition of fat accumulation and upregulation of LDL receptor. Obesity (Silver Spring) 2010; 18:667-74. [PMID: 19851306 DOI: 10.1038/oby.2009.337] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Fenugreek (Trigonella foenum-graecum) seeds, used as a condiment, are documented for health benefits including amelioration of abnormalities in lipid homeostasis due to its hypolipidemic properties. However, molecular mechanisms underlying the hypolipidemic effect of fenugreek seeds remain obscure. In this study, hypolipidemic effect of a novel thermostable extract of fenugreek seeds (TEFS) was evaluated in vitro by employing differentiating and differentiated 3T3-L1 cells, and HepG2 cells cultured in normal or sterol-enriched conditions. Hypolipidemic effect was studied by quantifying decrease in accumulation of fat or by western blot analysis of adipogenic and lipogenic factors. At molecular level, TEFS inhibited accumulation of fat in differentiating and differentiated 3T3-L1 cells via decreased expression of adipogenic factors such as peroxisome proliferators activated-receptor-gamma (PPAR-gamma), sterol regulatory element-binding protein-1 (SREBP-1), and CAAT element-binding proteins-alpha (c/EBP-alpha). We also show that following TEFS treatment, cellular triglycerides (TGs), and cholesterol concentrations decreased significantly (P < 0.05) in HepG2 cells via reduced expression of SREBP-1, at mRNA as well as protein level. Under sterol enriched condition, TEFS upregulated low-density lipoprotein receptor (LDLR) expression resulting in enhanced LDL uptake. Treating fat supplement fed C57BL6/J mice with TEFS for 15 days resulted in decrease of serum TG, LDL-cholesterol (LDLc), and body weight in a dose- and time-dependent manner (P < 0.05). Results indicate that hypolipidemic effect of TEFS is due to inhibition of fat accumulation and upregulation of LDLR. Taken together, the study suggests that TEFS may have potential application in the management of dyslipidemia and its associated metabolic disorders.
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