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Dong MP, Dharmaraj N, Kaminagakura E, Xue J, Leach DG, Hartgerink JD, Zhang M, Hanks HJ, Ye Y, Aouizerat BE, Vining K, Thomas CM, Dovat S, Young S, Viet CT. Stimulator of Interferon Genes Pathway Activation through the Controlled Release of STINGel Mediates Analgesia and Anti-Cancer Effects in Oral Squamous Cell Carcinoma. Biomedicines 2024; 12:920. [PMID: 38672274 PMCID: PMC11047833 DOI: 10.3390/biomedicines12040920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Revised: 04/15/2024] [Accepted: 04/18/2024] [Indexed: 04/28/2024] Open
Abstract
Oral squamous cell carcinoma (OSCC) presents significant treatment challenges due to its poor survival and intense pain at the primary cancer site. Cancer pain is debilitating, contributes to diminished quality of life, and causes opioid tolerance. The stimulator of interferon genes (STING) agonism has been investigated as an anti-cancer strategy. We have developed STINGel, an extended-release formulation that prolongs the availability of STING agonists, which has demonstrated an enhanced anti-tumor effect in OSCC compared to STING agonist injection. This study investigates the impact of intra-tumoral STINGel on OSCC-induced pain using two separate OSCC models and nociceptive behavioral assays. Intra-tumoral STINGel significantly reduced mechanical allodynia in the orofacial cancer model and alleviated thermal and mechanical hyperalgesia in the hind paw model. To determine the cellular signaling cascade contributing to the antinociceptive effect, we performed an in-depth analysis of immune cell populations via single-cell RNA-seq. We demonstrated an increase in M1-like macrophages and N1-like neutrophils after STINGel treatment. The identified regulatory pathways controlled immune response activation, myeloid cell differentiation, and cytoplasmic translation. Functional pathway analysis demonstrated the suppression of translation at neuron synapses and the negative regulation of neuron projection development in M2-like macrophages after STINGel treatment. Importantly, STINGel treatment upregulated TGF-β pathway signaling between various cell populations and peripheral nervous system (PNS) macrophages and enhanced TGF-β signaling within the PNS itself. Overall, this study sheds light on the mechanisms underlying STINGel-mediated antinociception and anti-tumorigenic impact.
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Affiliation(s)
- Minh Phuong Dong
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Loma Linda University, Loma Linda, CA 92350, USA; (M.P.D.); (M.Z.); (H.-J.H.)
| | - Neeraja Dharmaraj
- Katz Department of Oral Maxillofacial Surgery, The University of Texas Health Science Center at Houston, Houston, TX 77054, USA; (N.D.); (J.X.); (S.Y.)
| | - Estela Kaminagakura
- Department of Biosciences and Oral Diagnosis, Institute of Science and Technology, São Paulo State University (Unesp), São Paulo 12245-00, Brazil;
| | - Jianfei Xue
- Katz Department of Oral Maxillofacial Surgery, The University of Texas Health Science Center at Houston, Houston, TX 77054, USA; (N.D.); (J.X.); (S.Y.)
| | - David G. Leach
- Department of Chemistry, Rice University, Houston, TX 77005, USA; (D.G.L.); (J.D.H.)
- Department of Bioengineering, Rice University, Houston, TX 77005, USA
| | - Jeffrey D. Hartgerink
- Department of Chemistry, Rice University, Houston, TX 77005, USA; (D.G.L.); (J.D.H.)
- Department of Bioengineering, Rice University, Houston, TX 77005, USA
| | - Michael Zhang
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Loma Linda University, Loma Linda, CA 92350, USA; (M.P.D.); (M.Z.); (H.-J.H.)
| | - Hana-Joy Hanks
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Loma Linda University, Loma Linda, CA 92350, USA; (M.P.D.); (M.Z.); (H.-J.H.)
| | - Yi Ye
- Translational Research Center, Department of Oral and Maxillofacial Surgery, New York University College of Dentistry, New York, NY 10010, USA;
- NYU Pain Research Center, Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA;
| | - Bradley E. Aouizerat
- NYU Pain Research Center, Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA;
| | - Kyle Vining
- Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA;
- Department of Materials Science and Engineering, School of Engineering & Applied Science, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Carissa M. Thomas
- Department of Otolaryngology, University of Alabama at Birmingham, Birmingham, AL 35294, USA;
| | - Sinisa Dovat
- Department of Pediatrics, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA;
| | - Simon Young
- Katz Department of Oral Maxillofacial Surgery, The University of Texas Health Science Center at Houston, Houston, TX 77054, USA; (N.D.); (J.X.); (S.Y.)
| | - Chi T. Viet
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Loma Linda University, Loma Linda, CA 92350, USA; (M.P.D.); (M.Z.); (H.-J.H.)
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Thenmozhi S, Dharmaraj N, Kadirvelu K. Palladium oxide nanofibers: an efficient catalyst for cross-coupling of challenging aromatic nitriles. Chem Pap 2023. [DOI: 10.1007/s11696-023-02751-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
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3
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Shalini C, Dharmaraj N, Bhuvanesh NSP, Kaveri MV. Palladium(II) Pincer Type Complexes Containing ONO Donor Heterocyclic Hydrazones: Synthesis, Structure and Catalytic Activity Towards the Suzuki–Miyaura Cross-Coupling of 3-Bromochromone and Arylboronic Acids via C–Br Activation. Catal Letters 2023. [DOI: 10.1007/s10562-023-04276-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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4
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Shalini C, Dharmaraj N, Bhuvanesh NS, Kaveri M. Suzuki Miyaura cross-coupling of 2-chloropyrazine with arylboronic acids catalyzed by novel palladium(II) ONO pincer complexes. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Leach DG, Dharmaraj N, Lopez-Silva TL, Venzor JR, Pogostin BH, Sikora AG, Hartgerink JD, Young S. Biomaterial-Facilitated Immunotherapy for Established Oral Cancers. ACS Biomater Sci Eng 2021; 7:415-421. [PMID: 33470801 PMCID: PMC8325389 DOI: 10.1021/acsbiomaterials.0c01575] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We evaluated a peptide-based immunotherapy termed SynerGel: an injectable, biomaterial-based platform for intratumoral drug delivery. A drug-mimicking peptide hydrogel named L-NIL-MDP was loaded with an antitumor cyclic dinucleotide (CDN) immunotherapy agonist. The biomaterial combines inducible nitric oxide synthase (iNOS) inhibition with controlled delivery of CDNs, demonstrating between 4- and 20-fold slower drug release than commercially available hydrogels. SynerGel allowed for immune-mediated elimination of established treatment-resistant oral tumors in a murine model, with a median survival of 67.5 days compared with 44 days in no-treatment control. This report details findings for a promising therapy showing improved efficacy over previous hydrogel systems.
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Affiliation(s)
- David G. Leach
- Department of Chemistry, Department of Bioengineering, Rice University, Houston, TX 77005, USA
| | - Neeraja Dharmaraj
- Department of Oral & Maxillofacial Surgery, The University of Texas Health Science Center at Houston School of Dentistry, TX 77054, USA
| | - Tania L. Lopez-Silva
- Department of Chemistry, Department of Bioengineering, Rice University, Houston, TX 77005, USA
| | - Jose Rodriguez Venzor
- Department of Oral & Maxillofacial Surgery, The University of Texas Health Science Center at Houston School of Dentistry, TX 77054, USA
| | - Brett H. Pogostin
- Department of Chemistry, Department of Bioengineering, Rice University, Houston, TX 77005, USA
| | - Andrew G. Sikora
- Department of Head and Neck Surgery, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Jeffrey D. Hartgerink
- Department of Chemistry, Department of Bioengineering, Rice University, Houston, TX 77005, USA
| | - Simon Young
- Department of Oral & Maxillofacial Surgery, The University of Texas Health Science Center at Houston School of Dentistry, TX 77054, USA
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Piotrowski SL, Wilson L, Dharmaraj N, Hamze A, Clark A, Tailor R, Hill LR, Lai S, Kasper FK, Young S. Development and Characterization of a Rabbit Model of Compromised Maxillofacial Wound Healing. Tissue Eng Part C Methods 2020; 25:160-167. [PMID: 30747042 PMCID: PMC6457326 DOI: 10.1089/ten.tec.2018.0361] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
IMPACT STATEMENT Maxillofacial defects often present the clinical challenge of a compromised wound bed. Preclinical evaluation of tissue engineering techniques developed to facilitate healing and reconstruction typically involves animal models with ideal wound beds. The healthy wound bed scenario does not fully mimic the complex clinical environment in patients, which can lead to technology failure when translating from preclinical in vivo research to clinical use. The reported preclinical animal model of compromised wound healing enables investigation of tissue engineering technologies in a more clinically relevant scenario, potentially fostering translation of promising results in preclinical research to patients.
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Affiliation(s)
- Stacey L Piotrowski
- 1 Department of Oral and Maxillofacial Surgery, School of Dentistry, The University of Texas Health Science Center, Houston, Texas.,2 Center for Laboratory Animal Medicine and Care, The University of Texas Health Science Center, Houston, Texas.,3 Department of Veterinary Medicine and Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Lindsay Wilson
- 1 Department of Oral and Maxillofacial Surgery, School of Dentistry, The University of Texas Health Science Center, Houston, Texas
| | - Neeraja Dharmaraj
- 1 Department of Oral and Maxillofacial Surgery, School of Dentistry, The University of Texas Health Science Center, Houston, Texas
| | - Amani Hamze
- 1 Department of Oral and Maxillofacial Surgery, School of Dentistry, The University of Texas Health Science Center, Houston, Texas
| | - Ashley Clark
- 4 Department of Diagnostic and Biomedical Sciences, School of Dentistry, The University of Texas Health Science Center, Houston, Texas
| | - Ramesh Tailor
- 5 Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Lori R Hill
- 3 Department of Veterinary Medicine and Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Stephen Lai
- 6 Division of Surgery, Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - F Kurtis Kasper
- 7 Department of Orthodontics, School of Dentistry, Graduate School of Biomedical Sciences, The University of Texas Health Science Center, Houston, Texas
| | - Simon Young
- 1 Department of Oral and Maxillofacial Surgery, School of Dentistry, The University of Texas Health Science Center, Houston, Texas
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Young S, Dharmaraj N, Leach D, Piotrowski S, Sikora A, Hartgerink J. Biomaterials-Based Cancer Immunotherapy in Preclinical Models of Treatment-Resistant Head and Neck Cancer. J Oral Maxillofac Surg 2019. [DOI: 10.1016/j.joms.2019.06.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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8
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Newton JM, Hanoteau A, Liu HC, Gaspero A, Parikh F, Gartrell-Corrado RD, Hart TD, Laoui D, Van Ginderachter JA, Dharmaraj N, Spanos WC, Saenger Y, Young S, Sikora AG. Immune microenvironment modulation unmasks therapeutic benefit of radiotherapy and checkpoint inhibition. J Immunother Cancer 2019; 7:216. [PMID: 31409394 PMCID: PMC6693252 DOI: 10.1186/s40425-019-0698-6] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 07/31/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Immune checkpoint inhibitors (ICIs) for solid tumors, including those targeting programmed cell death 1 (PD-1) and cytotoxic T lymphocyte-associated antigen 4 (CTLA-4), have shown impressive clinical efficacy, however, most patients do not achieve durable responses. One major therapeutic obstacle is the immunosuppressive tumor immune microenvironment (TIME). Thus, we hypothesized that a strategy combining tumor-directed radiation with TIME immunomodulation could improve ICI response rates in established solid tumors. METHODS Using a syngeneic mouse model of human papillomavirus (HPV)-associated head and neck cancer, mEER, we developed a maximally effective regimen combining PD-1 and CTLA-4 inhibition, tumor-directed radiation, and two existing immunomodulatory drugs: cyclophosphamide (CTX) and a small-molecule inducible nitric oxide synthase (iNOS) inhibitor, L-n6-(1-iminoethyl)-lysine (L-NIL). We compared the effects of the various combinations of this regimen on tumor growth, overall survival, establishment of immunologic memory, and immunologic changes with flow cytometry and quantitative multiplex immunofluorescence. RESULTS We found PD-1 and CTLA-4 blockade, and radiotherapy alone or in combination, incapable of clearing established tumors or reversing the unfavorable balance of effector to suppressor cells in the TIME. However, modulation of the TIME with cyclophosphamide (CTX) and L-NIL in combination with dual checkpoint inhibition and radiation led to rejection of over 70% of established mEER tumors and doubled median survival in the B16 melanoma model. Anti-tumor activity was CD8+ T cell-dependent and led to development of immunologic memory against tumor-associated HPV antigens. Immune profiling revealed that CTX/L-NIL induced remodeling of myeloid cell populations in the TIME and tumor-draining lymph node and drove subsequent activation and intratumoral infiltration of CD8+ effector T cells. CONCLUSIONS Overall, this study demonstrates that modulation of the immunosuppressive TIME is required to unlock the benefits of ICIs and radiotherapy to induce immunologic rejection of treatment-refractory established solid tumors.
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Affiliation(s)
- Jared M. Newton
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX USA
- Interdepartmental Program in Translational Biology and Molecular Medicine, Houston, TX USA
| | - Aurelie Hanoteau
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX USA
| | - Hsuan-Chen Liu
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX USA
- Interdepartmental Program in Translational Biology and Molecular Medicine, Houston, TX USA
| | - Angelina Gaspero
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX USA
| | - Falguni Parikh
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX USA
| | - Robyn D. Gartrell-Corrado
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, Columbia University Irving Medical Center/New York Presbyterian, New York, NY USA
| | - Thomas D. Hart
- Department of Medicine, Division of Hematology/Oncology, Columbia University Irving Medical Center/New York Presbyterian, New York, NY USA
| | - Damya Laoui
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel (VUB), Brussels, Belgium
- Laboratory of Myeloid Cell Immunology, VIB Center for Inflammation Research, Brussels, Belgium
| | - Jo A. Van Ginderachter
- Laboratory of Cellular and Molecular Immunology, Vrije Universiteit Brussel (VUB), Brussels, Belgium
- Laboratory of Myeloid Cell Immunology, VIB Center for Inflammation Research, Brussels, Belgium
| | - Neeraja Dharmaraj
- Department of Oral and Maxillofacial Surgery, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, TX USA
| | - William C. Spanos
- Department of Surgery, University of South Dakota, Sanford School of Medicine, Vermillion, SD USA
| | - Yvonne Saenger
- Department of Medicine, Division of Hematology/Oncology, Columbia University Irving Medical Center/New York Presbyterian, New York, NY USA
| | - Simon Young
- Department of Oral and Maxillofacial Surgery, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, TX USA
| | - Andrew G. Sikora
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX USA
- Department of Cell and Gene Therapy, Baylor College of Medicine, Houston, TX USA
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Dharmaraj N, Piotrowski SL, Huang C, Newton JM, Golfman LS, Hanoteau A, Koshy ST, Li AW, Pulikkathara MX, Zhang B, Burks JK, Mooney DJ, Lei YL, Sikora AG, Young S. Anti-tumor immunity induced by ectopic expression of viral antigens is transient and limited by immune escape. Oncoimmunology 2019; 8:e1568809. [PMID: 30906661 DOI: 10.1080/2162402x.2019.1568809] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 12/10/2018] [Accepted: 01/08/2019] [Indexed: 12/14/2022] Open
Abstract
Immunotherapeutic treatments in head and neck cancer clinical trials include cancer vaccines targeting foreign viral antigens or mutational neoantigens derived from cancer-expressed proteins. Anti-tumor immune responses place cancer cells under selective pressure to lose or downregulate target antigens; therefore, vaccination against virus- or host- "driver" oncogenes are proposed as a strategy to overcome immune escape. Herein, we demonstrate the impact of immunogenic viral antigens on anti-tumor response and immune editing in MOC2-E6E7, a syngeneic murine oral cancer cell line expressing HPV-16 E6 and E7 oncoproteins. Using orthotopic syngeneic models, we observed in vivo tumor growth kinetics of MOC2-E6E7 is delayed in immunocompetent mice compared to parental MOC2 tumors. In contrast, tumor growth remained similar in Rag1-/- mice lacking adaptive immunity. MOC2-E6E7 tumors demonstrated an "inflamed" or immune-activated tumor microenvironment and greater infiltration of CD8+ T cells compared to MOC2. By real-time PCR, we detected downregulation of E6 and E7 genes in MOC2-E6E7 tumors only in immunocompetent mice, suggesting the loss of ectopic viral antigen expression due to immune editing. We then assessed the efficacy of a biomaterials-based mesoporous silica rod (MSR) cancer vaccine targeting HPV-16 E7 in our model. Vaccination induced robust infiltration of antigen-specific CD8+ T cells, which led to tumor growth delay and modestly prolonged survival in MOC2-E6E7 tumors. Increased efficacy was seen in a separate head and neck cancer tumor model, mEER, which obligately expresses E7 antigen. Collectively, our data highlight the need for both immunogenicity and 'driver' status of target antigens to be considered in cancer vaccine design.
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Affiliation(s)
- Neeraja Dharmaraj
- Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at Houston, School of Dentistry, Houston, TX, USA
| | - Stacey L Piotrowski
- Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at Houston, School of Dentistry, Houston, TX, USA.,Department of Comparative Pathobiology, Purdue University College of Veterinary Medicine, Purdue University, West Lafayette, IN, USA
| | - Chen Huang
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, USA
| | - Jared M Newton
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX, USA.,Interdepartmental Graduate Program in Translational Biology and Molecular Medicine, Baylor College of Medicine, Houston, TX, USA
| | - Leonard S Golfman
- Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at Houston, School of Dentistry, Houston, TX, USA
| | - Aurelie Hanoteau
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX, USA
| | - Sandeep T Koshy
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.,Wyss Institute Biologically Inspired Engineering, Harvard University, Boston, MA, USA.,Exploratory Immuno-Oncology, Novartis Institute of Biomedical Research, Cambridge, MA, USA
| | - Aileen W Li
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.,Wyss Institute Biologically Inspired Engineering, Harvard University, Boston, MA, USA.,Department of Cellular and Molecular Pharmacology, University of California San Francisco, San Francisco, CA, USA
| | | | - Bing Zhang
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, USA
| | - Jared K Burks
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - David J Mooney
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.,Wyss Institute Biologically Inspired Engineering, Harvard University, Boston, MA, USA
| | - Yu L Lei
- Department of Periodontics and Oral Medicine, University of Michigan Comprehensive Cancer Center, University of Michigan, Ann Arbor, MI, USA
| | - Andrew G Sikora
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX, USA
| | - Simon Young
- Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at Houston, School of Dentistry, Houston, TX, USA.,Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX, USA.,Department of BioEngineering, Rice University, Houston, TX, USA
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Young S, Dharmaraj N, Leach D, Piotrowski S, Sikora A, Hartgerink J. Biomaterials-Based Cancer Immunotherapy in Preclinical Models of Treatment-Resistant Head and Neck Cancer. J Oral Maxillofac Surg 2018. [DOI: 10.1016/j.joms.2018.06.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Leach DG, Dharmaraj N, Piotrowski SL, Lopez-Silva TL, Lei YL, Sikora AG, Young S, Hartgerink JD. STINGel: Controlled release of a cyclic dinucleotide for enhanced cancer immunotherapy. Biomaterials 2018; 163:67-75. [PMID: 29454236 PMCID: PMC5840037 DOI: 10.1016/j.biomaterials.2018.01.035] [Citation(s) in RCA: 135] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 01/18/2018] [Accepted: 01/22/2018] [Indexed: 12/11/2022]
Abstract
Recent advancements in the field of immunotherapy have yielded encouraging results for the treatment of advanced cancers. Cyclic dinucleotides (CDNs) are a powerful new class of immunotherapy drugs known as STING (Stimulator of Interferon Genes) agonists, currently in clinical trials. However, previous studies of CDNs in murine cancer models have required multiple injections, and improve survival only in relatively nonaggressive tumor models. Therefore, we sought to improve the efficacy of CDN immunotherapy by developing a novel biomaterial we call "STINGel." STINGel is an injectable peptide hydrogel that localizes and provides controlled release of CDN delivery, showing an 8-fold slower release rate compared to a standard collagen hydrogel. The carrier hydrogel is a positively charged, MultiDomain Peptide (MDP) which self-assembles to form a nanofibrous matrix and is easily delivered by syringe. The highly localized delivery of CDN from this nanostructured biomaterial affects the local histological response in a subcutaneous model, and dramatically improves overall survival in a challenging murine model of head and neck cancer compared to CDN alone or CDN delivered from a collagen hydrogel. This study demonstrates the feasibility of biomaterial-based immunotherapy platforms like STINGel as strategies for increasing the efficacy of CDN immunotherapies.
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Affiliation(s)
- David G Leach
- Department of Chemistry, Department of Bioengineering, Rice University, Houston, TX, 77005, USA
| | - Neeraja Dharmaraj
- Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at Houston, Houston, TX, 77054, USA
| | - Stacey L Piotrowski
- Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at Houston, Houston, TX, 77054, USA
| | - Tania L Lopez-Silva
- Department of Chemistry, Department of Bioengineering, Rice University, Houston, TX, 77005, USA
| | - Yu L Lei
- Department of Periodontics and Oral Medicine, University of Michigan Comprehensive Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Andrew G Sikora
- Department of Otolaryngology-Head and Neck Surgery, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Simon Young
- Department of Oral & Maxillofacial Surgery, University of Texas Health Science Center at Houston, Houston, TX, 77054, USA
| | - Jeffrey D Hartgerink
- Department of Chemistry, Department of Bioengineering, Rice University, Houston, TX, 77005, USA.
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Young S, Dharmaraj N, Piotrowski S, Koshy S, Li W, Mooney D, Sikora A. Overcoming Resistance to Checkpoint Inhibitors through a Rationally-Designed Combinatorial Immunotherapy Approach. J Oral Maxillofac Surg 2017. [DOI: 10.1016/j.joms.2017.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Vignesh A, Kaminsky W, Dharmaraj N. Palladium complexes catalyzed regioselective arylation of 2-oxindole via in situ C(sp2)−OH activation mediated by PyBroP. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.09.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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14
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Emayavaramban P, Babu SG, Karvembu R, Kadirvelu K, Dharmaraj N. Gold Nanoparticles Supported on Magnesium Oxide Nanorods for Oxidation of Alcohols. J Nanosci Nanotechnol 2016; 16:2517-2526. [PMID: 27455664 DOI: 10.1166/jnn.2016.10778] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Gold nanoparticles supported on magnesium oxide nanorods (Au-MgO) have been synthesised by a solution based chemical reduction method. Au-MgO nanorods were found to be an efficient heterogeneous catalyst for oxidation of alcohols with hydrogen peroxide in aqueous medium at room temperature. To find out the best reaction conditions for oxidation, optimization of catalyst quantity, solvent, mole equivalence of hydrogen peroxide were carried out. The scope of the reaction was extended to several aromatic and aliphatic alcohols, product yields were quantified by gas chromatography (GC) and GC/mass spectroscopy. Heterogeneity and reusability tests were performed. The use of water as a solvent and hydrogen peroxide as co-catalyst at room temperature makes the reaction interesting from sustainable development point of view.
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Emayavaramban P, Babu SG, Karvembu R, Dharmaraj N. Recyclable Mesoporous Ceria Supported Gold Nanoparticles Based Catalyst for O-Arylation of Phenols. J Nanosci Nanotechnol 2015; 15:9358-9368. [PMID: 26682356 DOI: 10.1166/jnn.2015.10354] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Ceria supported gold nanoparticles (Au-CeO2 NPs) were prepared by a simple deposition-precipitation method. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and Raman analysis indicated the formation of gold nanoparticles over phase pure cerianite ceria support. The presence of gold nanoparticles was well identified by UV-DRS study. In addition, the field emission scanning electron microscope (FESEM) and high resolution transmission electron microscope (HR-TEM) images revealed that the maximum number of particles having spherical shape were approximately 10 nm size. Subsequently, surface area of the catalyst determined from BET, Langmuir and DFT methods were found to be 83.1, 134 and 85.2 m2 g(-1) respectively. N2 absorption-desorption measurement revealed that Au-CeO2 NPs was mesoporous in nature. Au-CeO2 NPs proved to be an efficient catalyst for the O-arylation reactions. The reaction conditions were optimized using 2,6-dimethoxyphenol and 1-chloro-4-nitrobenzene as a model substrate by changing the solvent, base, quantity of catalyst, and temperature. The scope of the work was extended to various substituted phenols and aryl halides (F, Cl and Br) and reusability of catalyst was tested for four cycles which showed no loss in its activity.
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Jayanthi E, Anusuya M, Bhuvanesh N, Khalil K, Dharmaraj N. Synthesis and characterization of ruthenium(II) hydrazone complexes as anticancer chemotherapeutic agents: in vitro DNA/BSA protein binding and cytotoxicity assay. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1077950] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- E. Jayanthi
- Inorganic & Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore, India
| | - M. Anusuya
- Inorganic & Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore, India
| | - N.S.P. Bhuvanesh
- Department of Chemistry, Texas A&M University, College Station, TX, USA
| | - K.A. Khalil
- Department of Mechanical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia
- Faculty of Energy Engineering, Aswan University, Aswan, Egypt
| | - N. Dharmaraj
- Inorganic & Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore, India
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Alagesan M, Sathyadevi P, Krishnamoorthy P, Bhuvanesh NSP, Dharmaraj N. DMSO containing ruthenium(ii) hydrazone complexes: in vitro evaluation of biomolecular interaction and anticancer activity. Dalton Trans 2015; 43:15829-40. [PMID: 25223849 DOI: 10.1039/c4dt01032a] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Synthesis, spectral, electrochemical and single crystal X-ray diffraction data of a new series of DMSO containing bivalent ruthenium hydrazone complexes are presented. XRD data of two of the new complexes revealed an octahedral coordination around the ruthenium ion satisfied by NOS2Cl2 atoms. Electrochemical studies showed the metal centred, quasi-reversible, one-electron redox behaviour of the new complexes. The binding of these complexes with biomolecules such as calf thymus DNA (CT-DNA) and bovine serum albumin (BSA) protein investigated by different spectrophotometric methods revealed an intercalative mode of interaction. The in vitro cytotoxicity of these complexes evaluated by the MTT assay on a panel of cancer and normal cell lines indicated that the above complexes are more toxic to cancer cells with a few micromolar concentrations as the IC50 value, but are significantly less toxic to normal cell lines. The observed variations in the binding interactions and cytotoxicity of the complexes were attributed to the nature of the hydrazide moiety of the hydrazones that influences their biological activities.
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Affiliation(s)
- M Alagesan
- Inorganic & Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore 641 046, India.
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Selvakumar D, Dharmaraj N, Kumar NS, Padaki VC. Oxygen Sensing Properties of Platinum Doped Indium Oxide Nanoparticles Prepared by Hydrothermal Method. ACTA ACUST UNITED AC 2015. [DOI: 10.1080/15533174.2013.843548] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- D. Selvakumar
- Defence Bioengineering & Electromedical Laboratory, DRDO, Bangalore, India
- Inorganic & Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore, India
| | - N. Dharmaraj
- Inorganic & Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore, India
| | - N. S. Kumar
- Defence Bioengineering & Electromedical Laboratory, DRDO, Bangalore, India
| | - V. C. Padaki
- Defence Bioengineering & Electromedical Laboratory, DRDO, Bangalore, India
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Selvakumar D, Dharmaraj N, Kadirvelu K, Kumar NS, Padaki VC. Effect of sintering temperature on structural and optical properties of indium(III) oxide nanoparticles prepared with Triton X-100 by hydrothermal method. Spectrochim Acta A Mol Biomol Spectrosc 2014; 133:335-339. [PMID: 24960107 DOI: 10.1016/j.saa.2014.05.074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 05/14/2014] [Accepted: 05/28/2014] [Indexed: 06/03/2023]
Abstract
Indium(III) hydroxide (In(OH)3) powders prepared via Triton X-100 mediated hydrothermal method was sintered at different temperatures (400, 500 and 600°C) to yield indium(III) oxide nanoparticles (In2O3 NPs). Thermal studies of In(OH)3 confirmed complete conversion to In2O3 around 400°C. Powder X-ray diffraction (XRD) pattern of sintered In2O3 nanoparticles revealed the formation of phase pure cubic In2O3. The crystallite size of In2O3 NPs was increased from 12 to 26nm upon increasing the sintering temperature from 400°C to 600°C, while the percentage crystallinity was increased up to 90% after sintering at 600°C. A red shift in the band gap energy was observed with increasing sintering temperature due to the larger size of sintered In2O3 NPs. Room temperature photoluminescence spectra of the indium oxide nanoparticles showed both near band and excitonic emission of In2O3 due to oxygen vacancies.
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Affiliation(s)
- D Selvakumar
- Defence Bioengineering and Electromedical Laboratory, Bangalore 560 093, India; Inorganic & Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore 641 046, India
| | - N Dharmaraj
- Inorganic & Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore 641 046, India.
| | - K Kadirvelu
- DRDO-BU Center for Life Sciences, Bharathiar University, Coimbatore 641 046, India
| | - N S Kumar
- Defence Bioengineering and Electromedical Laboratory, Bangalore 560 093, India
| | - V C Padaki
- Defence Bioengineering and Electromedical Laboratory, Bangalore 560 093, India
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Dharmaraj N, Chapela PJ, Morgado M, Hawkins SM, Lessey BA, Young SL, Carson DD. Expression of the transmembrane mucins, MUC1, MUC4 and MUC16, in normal endometrium and in endometriosis. Hum Reprod 2014; 29:1730-8. [PMID: 24939955 PMCID: PMC4093996 DOI: 10.1093/humrep/deu146] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 05/13/2014] [Accepted: 05/20/2014] [Indexed: 12/15/2022] Open
Abstract
STUDY QUESTION Are the transmembrane mucins, MUC1, MUC4 and MUC16, differentially expressed in endometriosis compared with normal endometrium? SUMMARY ANSWER This study revealed that transmembrane mucin expression does not vary significantly in normal endometrium during the menstrual cycle and is not altered in endometriosis relative to the epithelial marker, cytokeratin-18 (KRT18). WHAT IS KNOWN ALREADY Increased serum levels of the transmembrane mucin fragments MUC1, MUC4 and MUC16 that normally dominate the apical surface of simple epithelia are found in several pathological conditions, including endometriosis. Altered mucin expression in gynecologic diseases may promote infertility or endometrial pathologies. STUDY DESIGN, SIZE, DURATION This was a laboratory-based study of samples from 12 endometriosis patients as well as non-endometriosis control samples obtained from 31 patients. PARTICIPANTS/MATERIALS, SETTING, METHODS Total RNA was isolated from endometrial biopsies of ectopic and eutopic endometrium from women with endometriosis and control patients from different stages of the menstrual cycle. Quantitative (q)-RT-PCR analyses were performed for the mucins, MUC1, MUC4 and MUC16, relative to the epithelial marker, cytokeratin-18 (KRT18), or β-actin (ACTB). Frozen sections from endometrial biopsies of proliferative and mid-secretory stage women with endometriosis were immunostained for MUC1, MUC4 and MUC16. MAIN RESULTS AND THE ROLE OF CHANCE qRT-PCR analyses of MUC1 and MUC16 mRNA revealed that these mucins do not vary significantly during the menstrual cycle nor are they altered in women with endometriosis relative to the epithelial marker, KRT18. MUC4 mRNA is expressed at very low levels relative to MUC1 and MUC16 under all conditions. There was little difference in MUC1 and MUC16 expression between eutopic endometrial and ectopic endometriotic tissues. MUC4 expression also was not significantly higher in the ectopic endometriotic tissues. Immunostaining for all three mucins reveals robust expression of MUC1 and MUC16 at the apical surfaces of endometrial epithelia, but little to no staining for MUC4. LIMITATIONS, REASONS FOR CAUTION qRT-PCR analysis was the main method used for mucin detection. Additional studies with stage III-IV endometriotic tissue would be useful to determine if changes in MUC1 and MUC16 expression occur, or if MUC4 expression increases, at later stages of endometriosis. WIDER IMPLICATIONS OF THE FINDINGS We report a comprehensive comparative profile of the major transmembrane mucins, MUC1, MUC4 and MUC16, relative to the epithelial marker, KRT18, in normal cycling endometrium and in endometriosis, and indicate constitutive expression. Previous studies have profiled the expression of individual mucins relative to β-actin and indicate accumulation in the luteal phase. Thus, these differences in interpretation appear to reflect the increased epithelial content of endometrium during the luteal phase. STUDY FUNDING This study was supported by: NIH R01HD29963 to D.D.C.; NIH U54HD007495 to S.M.H.; and NIH R01HD067721 to S.L.Y. and B.A.L. The authors have no competing interests to declare.
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Affiliation(s)
- N Dharmaraj
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251, USA
| | - P J Chapela
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251, USA
| | - M Morgado
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251, USA
| | - S M Hawkins
- Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, TX 77030, USA
| | - B A Lessey
- Department of Obstetrics and Gynecology, Greenville Health System, Greenville, SC 29650, USA
| | - S L Young
- Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA
| | - D D Carson
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251, USA Department of Biochemistry and Molecular Biology, M.D. Anderson Cancer Center, Houston, TX 77030, USA
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Selvakumar D, Dharmaraj N, Kumar N, Padaki V. Preparation, surface morphology, and optical properties of indium(III) oxide nanoparticles by thermolysis of indium–poly(vinyl alcohol) coordination polymer. J COORD CHEM 2014. [DOI: 10.1080/00958972.2014.932354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- D. Selvakumar
- Defence Bioengineering and Electromedical Laboratory, Bangalore, India
- Inorganic and Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore, India
| | - N. Dharmaraj
- Inorganic and Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore, India
| | - N.S. Kumar
- Defence Bioengineering and Electromedical Laboratory, Bangalore, India
| | - V.C. Padaki
- Defence Bioengineering and Electromedical Laboratory, Bangalore, India
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Alagesan M, Bhuvanesh NSP, Dharmaraj N. Binuclear copper complexes: synthesis, X-ray structure and interaction study with nucleotide/protein by in vitro biochemical and electrochemical analysis. Eur J Med Chem 2014; 78:281-93. [PMID: 24686015 DOI: 10.1016/j.ejmech.2014.03.043] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 02/17/2014] [Accepted: 03/14/2014] [Indexed: 10/25/2022]
Abstract
Two new, binuclear copper(II) hydrazone complexes have been synthesized and characterized by various physico-chemical techniques including single crystal X-ray diffraction. Interaction of these complexes with nucleotide and protein were analyzed by in vitro biochemical and electrochemical analysis. Both the complexes exhibited intercalative mode of binding with DNA. Further, gel electrophoresis assay demonstrated the ability of the complexes to cleave the supercoiled pBR322 plasmid DNA to nicked circular DNA form. Cytotoxicity of the complexes performed against a panel of cancer cell lines and a normal cell line proved that these complexes are potentially cytotoxic against the cancerous cell lines, particularly with IC50 as low as 0.7 μM against HeLa cell line.
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Affiliation(s)
- M Alagesan
- Inorganic and Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore 641 046, India
| | - N S P Bhuvanesh
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA
| | - N Dharmaraj
- Inorganic and Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore 641 046, India.
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Sangami G, Nirmala R, Kim HY, Dharmaraj N. Photodegradation of 4-nitrophenol using cadmium sulphide nanoparticles. J Nanosci Nanotechnol 2014; 14:2299-2306. [PMID: 24745225 DOI: 10.1166/jnn.2014.8536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
An efficient method to degrade 4-nitrophenol (4-NP) using cadmium sulphide nanoparticles (CdS NPs) prepared by a novel method as a photocatalyst in the presence of H2O2 as a free radical generator was developed. To investigate the degradation mechanism, the interaction between the substrate (4-NP) and the catalyst (CdS NPs) was studied using UV-visible absorption and emission spectral techniques. Investigation on the effect of pH of the medium on the degradability of 4-NP revealed that neither the acidic (pH 4) nor alkaline (pH 9) is as suitable as pH 6 due to the desorption of 4-NP from the catalyst surface at the former condition and the existence of 4-NP in its most stable quinonoid form at the latter pH. Similarly, the effect of ratio between the photocatalyst (CdS NPs) and the substrate (4-NP) was also investigated to achieve higher efficiency in the photocatalytic reaction.
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Neelakandeswari N, Karvembu R, Dharmaraj N. Mesoporous nickel-aluminosilicate nanocomposite: a solid acid catalyst for ether synthesis. J Nanosci Nanotechnol 2013; 13:2853-2863. [PMID: 23763171 DOI: 10.1166/jnn.2013.7419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Mesoporous nickel aluminosilicate, a solid acid catalyst prepared by sol-gel technique was utilized as a heterogeneous catalyst for the synthesis of symmetrical ethers by dehydro-condensation of alcohols. The prepared catalysts were characterized by Fourier-transform infra red spectroscopy (FT-IR), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), N2 adsorption-desorption analysis, temperature programmed desorption of ammonia (TPD) and X-ray photoelectron spectroscopic techniques. The presence of the catalyst assisted the etherification reaction in 30 minutes. Ethers formed in these reactions were quantified by gas chromatography (GC) and the identities of few of them were confirmed by nuclear magnetic resonance spectral data (NMR).
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Affiliation(s)
- N Neelakandeswari
- Inorganic and Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore 641046, India
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Babu SG, Neelakandeswari N, Dharmaraj N, Jackson SD, Karvembu R. Copper(ii) oxide on aluminosilicate mediated Heck coupling of styrene with aryl halides in water. RSC Adv 2013. [DOI: 10.1039/c3ra23246h] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Sangami G, Dharmaraj N. UV-visible spectroscopic estimation of photodegradation of rhodamine-B dye using tin(IV) oxide nanoparticles. Spectrochim Acta A Mol Biomol Spectrosc 2012; 97:847-852. [PMID: 22902583 DOI: 10.1016/j.saa.2012.07.068] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Revised: 07/14/2012] [Accepted: 07/17/2012] [Indexed: 06/01/2023]
Abstract
Nanocrystalline, tin(IV) oxide (SnO(2)) particles has been prepared by thermal decomposition of tin oxalate precursor obtained from the reactions of tin(IV) chloride and sodium oxalate using eggshell membrane (ESM). The as-prepared SnO(2) nanoparticles were characterized by thermal studies, transmission electron microscopy (TEM), powder X-ray diffraction (XRD), Raman, FT-IR and UV-visible studies and used as a photocatalyst for the degradation of rhodamine-B (Rh-B) dye. The size of the prepared nanoparticles was in the range of 5-12nm as identified from the TEM images. Powder XRD data revealed the presence of a tetragonal, rutile crystalline phase of the tin(IV) oxide nanoparticles. Thermal analysis showed that the decomposition of tin oxalate precursor to yield the titled tin(IV) oxide nanoparticles was completed below 500°C. The extent of degradation of Rh-B in the presence of SnO(2) monitored by absorption spectral measurements demonstrated that 94.48% of the selected dye was degraded upon irradiation with UV light for 60 min.
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Affiliation(s)
- G Sangami
- Department of Chemistry, Bharathiar University, Coimbatore 641046, India
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Dharmaraj N, Carson DD. Abstract 3070: Activated EGFR and PPARδ regulate MUC1 expression in human uterine and pancreatic cancer cell lines. Cancer Res 2012. [DOI: 10.1158/1538-7445.am2012-3070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The high molecular weight, transmembrane mucin, MUC1 is expressed at high levels in many epithelial tumors including endometrial and pancreatic cancers. Aberrant glcosylation and overexpression of MUC1 make tumor cells poorly adherent, protect tumor cells from the host immune system, promote metastases from primary sites and enhance resistance to chemotherapeutic drugs. MUC1 has three distinct domains: an extracellular domain (ECD) composed of a tandem repeat region rich in serine, threonine and proline; a transmembrane domain (TM) and; a short cytoplasmic tail domain (CT) involved in a variety of signal transduction events. Epidermal Growth Factor Receptor (EGFR/erbB) family members regulate cell growth and survival in both normal and cancer cells. MUC1 interacts with erbB receptors and also affects downstream signaling pathways in a EGFR-ligand dependent manner. We previously demonstrated that the Peroxisome Proliferator Activated Receptor ≤ (PPARδ) agonist rosiglitazone severely inhibits progesterone stimulated MUC1 expression (Wang et al. 2010. Mol. Endocrinol. 24: 1368-1379). Two independent approaches were used to determine if rosiglitazone as well as EGFR tyrosine kinase inhibitor, AG1478 reduced MUC1 expression in a high MUC1-expressing cell line, HES; the uterine adenocarcinoma cell line, HEC-1A; and in the human pancreatic adenocarcinoma cell lines, HPAFII and CAPAN2. EGFR activation by Epidermal Growth Factor (EGF) stimulated MUC1 protein expression (1.5-2 fold) in both uterine and pancreatic cancer cells. The PPARδ agonist, rosiglitatzone, markedly (> 90%) reduced EGFR-driven MUC1 expression detected by antibodies directed against the MUC1 ECD and CT. Preliminary studies indicate that rosiglitazone effects on EGFR-driven MUC1 expression is indirect. Furthermore, rosiglitazone treatments enhanced EGFR degradation via the lysosomal degradation pathway in the presence of EGF-family ligands in both uterine and pancreatic cancer cell lines. A combination of biochemical and molecular biological assays have been used to identify the transcriptional and signal transduction pathways activated by EGFR, leading to increased MUC1 expression and the impact of AG1478 and rosiglitazone on these events. Understanding the molecular basis of how these agents reduce MUC1 expression may offer novel therapeutic avenues to improve cancer chemotherapies.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 103rd Annual Meeting of the American Association for Cancer Research; 2012 Mar 31-Apr 4; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2012;72(8 Suppl):Abstract nr 3070. doi:1538-7445.AM2012-3070
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Neelakandeswari N, Sangami G, Emayavaramban P, Ganesh Babu S, Karvembu R, Dharmaraj N. Preparation and characterization of nickel aluminosilicate nanocomposites for transfer hydrogenation of carbonyl compounds. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcata.2011.12.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Sathyadevi P, Krishnamoorthy P, Alagesan M, Thanigaimani K, Thomas Muthiah P, Dharmaraj N. Synthesis, crystal structure, electrochemistry and studies on protein binding, antioxidant and biocidal activities of Ni(II) and Co(II) hydrazone complexes. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.09.021] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
Membrane-tethered mucin glycoproteins are abundantly expressed at the apical surfaces of simple epithelia, where they play important roles in lubricating and protecting tissues from pathogens and enzymatic attack. Notable examples of these mucins are MUC1, MUC4 and MUC16 (also known as cancer antigen 125). In adenocarcinomas, apical mucin restriction is lost and overall expression is often highly increased. High-level mucin expression protects tumors from killing by the host immune system, as well as by chemotherapeutic agents, and affords protection from apoptosis. Mucin expression can increase as the result of gene duplication and/or in response to hormones, cytokines and growth factors prevalent in the tumor milieu. Rises in the normally low levels of mucin fragments in serum have been used as markers of disease, such as tumor burden, for many years. Currently, several approaches are being examined that target mucins for immunization or nanomedicine using mucin-specific antibodies.
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Affiliation(s)
- Pamela E Constantinou
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251-1892, USA
| | - Brian P Danysh
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251-1892, USA
| | - Neeraja Dharmaraj
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251-1892, USA
| | - Daniel D Carson
- Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77251-1892, USA
- Department of Biochemistry and Molecular Biology, MD Anderson Cancer Center, Houston, TX 77030, USA
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Krishnamoorthy P, Sathyadevi P, Senthilkumar K, Muthiah PT, Ramesh R, Dharmaraj N. Copper(I) hydrazone complexes: Synthesis, structure, DNA binding, radical scavenging and computational studies. INORG CHEM COMMUN 2011. [DOI: 10.1016/j.inoche.2011.05.004] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Affiliation(s)
| | - G. Sangami
- a Department of Chemistry , Bharathiar University , Coimbatore, India
| | - N. Dharmaraj
- a Department of Chemistry , Bharathiar University , Coimbatore, India
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Krishnamoorthy P, Sathyadevi P, Cowley AH, Butorac RR, Dharmaraj N. Evaluation of DNA binding, DNA cleavage, protein binding and in vitro cytotoxic activities of bivalent transition metal hydrazone complexes. Eur J Med Chem 2011; 46:3376-87. [PMID: 21600679 DOI: 10.1016/j.ejmech.2011.05.001] [Citation(s) in RCA: 241] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Revised: 04/25/2011] [Accepted: 05/02/2011] [Indexed: 11/18/2022]
Abstract
Divalent Co, Ni and Cu hydrazone complexes containing [N'-(phenyl(pyridine-2-yl)methylidene) benzohydrazide] ligand were synthesised and characterised. Interactions of these complexes with DNA revealed an intercalative mode of binding between them. Further, all the hydrazone chelates showed moderate ability to cleave pUC19 DNA. Synchronous fluorescence spectra proved that the interaction of metal complexes with bovine serum albumin (BSA) resulted in a conformational change of the latter. Assay on the cytotoxicity of the above complexes against HeLa tumor cells and NIH 3T3 normal cells revealed that the complexes are toxic only against tumor cells but not to normal cells. In all the biological assays, the complex with copper ion as the metal center showed enhanced activities than the other two.
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Affiliation(s)
- P Krishnamoorthy
- Department of Chemistry, Bharathiar University, Coimbatore 641 046, India
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Neelakandeswari N, Sangami G, Dharmaraj N, Taek NK, Kim HY. Spectroscopic investigations on the photodegradation of toluidine blue dye using cadmium sulphide nanoparticles prepared by a novel method. Spectrochim Acta A Mol Biomol Spectrosc 2011; 78:1592-8. [PMID: 21382744 DOI: 10.1016/j.saa.2011.02.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Revised: 01/21/2011] [Accepted: 02/07/2011] [Indexed: 05/16/2023]
Abstract
A novel method to prepare cadmium sulphide nanoparticles (CdS NPs) possessing nearly uniform size was adopted using eggshell membrane (ESM), under different pH conditions. Significant yield of CdS NPs with smallest possible size was obtained by increasing the pH of the reaction medium from acidic to alkaline. The above prepared CdS NPs have been characterized by UV-vis absorption as well as emission spectra, powder X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The efficiency of the above prepared CdS NPs as a catalyst for the photodegradation of toluidine blue (TB) dye, as a function of pH as well as the ratio between the catalyst and the substrate was studied after irradiation with UV light. The results showed that an efficient interaction took place between the catalyst and the substrate to cause degradation of the selected dye. A maximum degradation of toluidine blue dye (90%) was observed at pH 8 which is higher than that of the efficiencies at pH 4 and pH 6.
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Dharmaraj N, Carson DD. Abstract 2032: Regulation of MUC1 expression by activated EGFR and PPARγ in human uterine and pancreatic cancer cell lines. Cancer Res 2011. [DOI: 10.1158/1538-7445.am2011-2032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Many epithelial tumors including endometrial and pancreatic cancers, overexpress the high molecular weight, transmembrane mucin, MUC1, on their cell surface. Overexpression and aberrant glycosylation of MUC1 makes tumor cells poorly adherent, increases drug resistance and promotes cancer cell metastasis. MUC1 has three distinct domains: an extracellular domain (ECD) composed of a tandem repeat region rich in serine, threonine and proline; a transmembrane domain (TM) and; a short cytoplasmic tail domain (CT) involved in a variety of signal transduction events. Previous studies (Wang et al. 2010. Mol. Endocrinol. 24: 1368-1379) demonstrated that the Peroxisome Proliferator Activated Receptor γ (PPARγ) agonist, rosiglitazone severely inhibits progesterone stimulated MUC1 expression. Two independent approaches were used to determine if rosiglitazone as well as inhibitors of Epidermal Growth Factor Receptor (EGFR) tyrosine kinase activity reduced MUC1 expression in the human uterine epithelial cell line, HES, the uterine adenocarcinoma cell line, HEC-1A, and in the human pancreatic adenocarcinoma cell lines, HPAFII and CAPAN2. EGFR activation by Epidermal Growth Factor (EGF) stimulated (1.5-2 fold) MUC1 protein expression 1.5-2.0 fold in both uterine and pancreatic cancer cells, while treatment with EGFR tyrosine kinase inhibitor, AG1478, reduced both basal and stimulated MUC1 protein expression. Furthermore, the PPARγ agonist, rosiglitatzone, markedly (> 90%) reduced EGFR-driven MUC1 expression detected by antibodies directed against the MUC1 ECD and CT. A combination of biochemical and molecular biological assays have been used to identify the transcriptional and signal transduction pathways activated by EGFR leading to increased MUC1 expression and the impact of AG1478 and rosiglitazone on these events. Understanding the molecular basis of how these agents reduce MUC1 expression may offer novel therapeutic avenues to improve cancer chemotherapies.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 2032. doi:10.1158/1538-7445.AM2011-2032
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Prabhakaran R, Anantharaman S, Thilagavathi M, Kaveri MV, Kalaivani P, Karvembu R, Dharmaraj N, Bertagnolli H, Dallemer F, Natarajan K. Preparation, spectroscopy, EXAFS, electrochemistry and pharmacology of new ruthenium(II) carbonyl complexes containing ferrocenylthiosemicarbazone and triphenylphosphine/arsine. Spectrochim Acta A Mol Biomol Spectrosc 2011; 78:844-853. [PMID: 21216187 DOI: 10.1016/j.saa.2010.12.046] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Revised: 12/10/2010] [Accepted: 12/14/2010] [Indexed: 05/30/2023]
Abstract
A new series of new hetero-bimetallic complexes containing iron and ruthenium of the general formula [RuCl(CO)(B)(EPh3)(L)] (where E=P or As; B=PPh3, AsPh3, py or pip; L=ferrocene derived monobasic bidentate thiosemicarbazone ligand) have been synthesized by the reaction between ferrocene-derived thiosemicarbazones and ruthenium(II) complexes of the type [RuHCl(CO)(B)(EPh3)2] (where E=P or As; B=PPh3, AsPh3, py or pip). The new complexes have been characterized by elemental analyses, IR, electronic, NMR (1H, 13C and 31P), EXAFS (extended X-ray absorption fine structure spectroscopy) and cyclic voltammetric techniques. Antibacterial activity of the new complexes has been screened against Escherichia coli, Vibrio cholerae, and Pseudomonas aeruginosa species.
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Affiliation(s)
- R Prabhakaran
- Department of Chemistry, Bharathiar University, Coimbatore 641 046, India
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Abstract
Mucin 1 (MUC1), a transmembrane mucin expressed at the apical surface of uterine epithelia, is a barrier to microbial infection and enzymatic attack. MUC1 loss at implantation sites appears to be required to permit embryo attachment and implantation in most species. MUC1 expression is regulated by progesterone (P) and proinflammatory cytokines, including TNFα and interferon γ (IFNγ). TNFα and IFNγ are highly expressed in uterine tissues under conditions where MUC1 expression is also high and activate MUC1 expression via their downstream transcription factors, nuclear factor (NF) κB and signal transducers and activators of transcription. P receptor (PR) regulates MUC1 gene expression in a PR isoform-specific fashion. Here we demonstrate that interactions among PR isoforms and cytokine-activated transcription factors cooperatively regulate MUC1 expression in a human uterine epithelial cell line, HES. Low doses of IFNγ and TNFα synergistically stimulate MUC1 promoter activity, enhance PRB stimulation of MUC1 promoter activity and cooperate with PRA to stimulate MUC1 promoter activity. Cooperative stimulation of MUC1 promoter activity requires the DNA-binding domain of the PR isoforms. MUC1 mRNA and protein expression is increased by cytokine and P treatment in HES cells stably expressing PRB. Using chromatin immunoprecipitation assays, we demonstrate efficient recruitment of NFκB, p300, SRC3 (steroid receptor coactivator 3), and PR to the MUC1 promoter. Collectively, our studies indicate a dynamic interplay among cytokine-activated transcription factors, PR isoforms and transcriptional coregulators in modulating MUC1 expression. This interplay may have important consequences in both normal and pathological contexts, e.g. implantation failure and recurrent miscarriages.
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Affiliation(s)
- Neeraja Dharmaraj
- Department of Biological Sciences, University of Delaware, Newark, Delaware 19716, USA
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Krishnamoorthy P, Sathyadevi P, Deepa K, Dharmaraj N. Studies on the synthesis, spectra, catalytic and antibacterial activities of binuclear ruthenium(II) complexes. Spectrochim Acta A Mol Biomol Spectrosc 2010; 77:258-263. [PMID: 20538510 DOI: 10.1016/j.saa.2010.05.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2010] [Revised: 04/28/2010] [Accepted: 05/15/2010] [Indexed: 05/29/2023]
Abstract
A new series of stable binuclear ruthenium(II) carbonyl complexes of the general formula [{RuX(CO)(EPh(3))(2)}(2)L] (where X=H or Cl; E=P or As and L=dibasic tetradentate diacetyl resorcinol (H(2)-DAR)) have been synthesised by reacting ruthenium(II) starting complexes [RuHX(CO)(EPh(3))(3)] (where X=H or Cl; E=P or As) and 4,6-diacetylresorcinol (H(2)-DAR) ligand in benzene medium. The structure of the new binuclear ruthenium(II) carbonyl complexes was established using elemental analysis, spectra (FT-IR, UV-vis and (1)H NMR), electrochemical and thermal studies. In these reactions, the 4,6-diacetylresorcinol (H(2)-DAR) ligand behaves as a binegative tetradentate chelating ligand coordinating through O,O atoms of both the carbonyl and phenolic C-O groups by replacing a molecule of PPh(3)/AsPh(3) and a hydride ion from the starting complexes. Further, all these complexes were also employed as new catalysts for the oxidation of primary and secondary alcohols in the presence of N-methylmorpholine-N-oxide (NMO) as a more viable co-oxidant. The free ligand and their metal complexes have also been screened for their antibacterial activity against the growth of gram +ve and gram -ve bacterial cultures.
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Affiliation(s)
- P Krishnamoorthy
- Department of Chemistry, Bharathiar University, Coimbatore 641 046, India
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Wang P, Dharmaraj N, Brayman MJ, Carson DD. Peroxisome proliferator-activated receptor gamma activation inhibits progesterone-stimulated human MUC1 expression. Mol Endocrinol 2010; 24:1368-79. [PMID: 20484415 DOI: 10.1210/me.2009-0221] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Mucin 1 (MUC1) is a type I transmembrane glycoprotein abundantly expressed on nearly all epithelial tissues and overexpressed by many cancer cells. Previous studies from our lab showed that progesterone receptor (PR)B is a strong stimulator of MUC1 gene expression. It is reported that liganded peroxisome proliferator-activated receptor gamma (PPARgamma) stimulates Muc1 expression in murine trophoblast. Here, we demonstrate that although the PPARgamma ligand, rosiglitazone, stimulates the murine Muc1 promoter in HEC1A, a human uterine epithelial cell line, rosiglitazone alone, has no significant effect on basal human MUC1 promoter activity. In fact, rosiglitazone treatment antagonizes progesterone-stimulated human MUC1 promoter activity and protein expression in two human uterine epithelial cell lines and T47D human breast cancer cells. This response is antagonized by the PPARgamma antagonist, GW9662, as well as a dominant-negative form of PPARgamma, demonstrating the response is mediated by PPARgamma. Additional studies indicate that PPARgamma activation does not change PR binding to the MUC1 promoter but generally antagonizes progesterone activity by stimulating PRB degradation and inhibiting progesterone-induced PRB phosphorylation. Collectively, these studies indicate that PPARgamma activation inhibits PRB activity through both acute (phosphorylation) and long-term (PRB degradation) pathways.
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Affiliation(s)
- Peng Wang
- Department of Biological Sciences, University of Delaware, Newark, Delaware 19716, USA
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Abstract
Understanding the underlying mechanisms by which a normal cell avoids the oncogenic potential of MUC1 signaling requires further definition of the pathways by which the MUC1 cytoplasmic tail is processed in both normal and tumor-derived cells. In the present study we describe the processing pathway initiated by TACE/ADAM17 cleavage of MUC1. Utilizing the human uterine epithelial cell line, HES, derived from normal endometrium, we show that endogenous full length MUC1 undergoes regulated intramembranous proteolysis mediated by presenillin-dependent gamma-secretase. Cytokine-stimulated HES cells exposed to gamma-secretase inhibitors accumulated a membrane-associated 15 kDa fragment of the MUC1 C-terminal subunit (CTF15). Inhibitors of TACE/ADAM17-mediated shedding inhibited accumulation of MUC1-CTF15 and MUC1 ectodomain release to a similar extent consistent with MUC1-CTF15 being a product of TACE/ADAM17 action. Reduction of catalytically active gamma-secretase complex by nicastrin siRNA treatment also resulted in CTF15 accumulation. Furthermore, mature nicastrin, the substrate receptor for gamma-secretase, co-immunoprecipitated with CTF15 in the presence of gamma-secretase inhibitors indicating the formation of CTF15: nicastrin complexes. MUC1-CTF15 accumulation in response to gamma-secretase inhibition was demonstrated in both normal and tumor-derived cells from humans and mice indicating that this processing pathway exists in many cell contexts. We did not detect products of MUC1 cleavage by gamma-secretase in the presence of various proteasomal inhibitors indicating that subsequent degradation is either non-proteasomal or extremely efficient. We suggest that this efficient pathway attenuates potential signaling mediated by cytoplasmic tail fragments.
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Affiliation(s)
- Joanne Julian
- Department of Biological Sciences, University of Delaware, Newark, Delaware 19716, USA
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Prabu P, Chaudhari AA, Dharmaraj N, Khil MS, Park SY, Kim HY. Preparation, characterization,in-vitrodrug release and cellular uptake of poly(caprolactone) grafted dextran copolymeric nanoparticles loaded with anticancer drug. J Biomed Mater Res A 2009; 90:1128-36. [DOI: 10.1002/jbm.a.32163] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
Embryo implantation involves direct interaction of the blastocyst with the luminal epithelium of the receptive uterus. MUC1, a transmembrane mucin expressed at the apical surface of uterine epithelia, acts as a barrier to microbial infection and enzymatic attack. Loss of MUC1 is believed to be a prerequisite for a functionally receptive uterus across many species. Human and murine MUC1 regulation by steroid hormones displays important differences. Estrogen (E2) stimulates MUC1 expression in mice, and progesterone (P4) antagonizes E2 action in this regard. MUC1 expression is severely reduced during the receptive uterine state in mice. In contrast, human MUC1 expression is maximal at the receptive or midluteal phase, when P4 levels are high. No information is available regarding regulation of human MUC1 in vivo at the site of embryo attachment. Our aim was to better understand regulation of human MUC1 during early pregnancy in vivo. For this purpose, we used a transgenic mouse carrying full-length human MUC1 gene (Tg(MUC1)79.24Gend) as well as endogenous MUC1 as a model system. Human MUC1 was detected by real-time RT-PCR, Western blotting, and immunohistochemistry during early pregnancy. Our data indicate that human MUC1 persists at reduced (20% relative to Day 1 postcoitum) levels in receptive-phase uteri, including the site of embryo attachment. In contrast, mouse MUC1 was much more severely (>98% relative to Day 1 postcoitum) reduced in the same context. These observations are consistent with distinct regulation between the human and mouse genes. Because these genes are expressed in the same transcriptional context (i.e., mouse uterine epithelia), structural differences between human and murine genes must account for these differences in MUC1 regulation.
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Affiliation(s)
- Neeraja Dharmaraj
- Department of Biological Sciences, University of Delaware, Newark, Delaware, USA
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Abstract
MUC1 is a multifunctional cell surface glycoprotein that modulates cell adhesion, protects mucosa from infection and enzymatic attack, lubricates cell surfaces, participates in multiple signal-transduction pathways and is overexpressed by many tumors. MUC1 levels change dynamically in various cellular contexts. The primary mechanism for controlling MUC1 expression appears to be transcriptional through a complex combination of often overlapping regulatory motifs that control both tissue specificity and overall rate of transcription. This review will summarize the current knowledge of the factors known to control MUC1 transcriptional regulation, including cytokines, steroid hormones and the growth factors they stimulate, as well as suggest how this information may be exploited in the future to control MUC1 expression in specific biological contexts.
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Affiliation(s)
- Daniel D Carson
- a Department of Biological Sciences, 118C Wolf Hall, University of Delaware, Newark, DE 19716, USA.
| | - Neeraja Dharmaraj
- b Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Peng Wang
- b Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
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Prabu P, Chaudhari AA, Aryal S, Dharmaraj N, Park SY, Kim WD, Kim HY. In vitro evaluation of poly(caporlactone) grafted dextran (PGD) nanoparticles with cancer cell. J Mater Sci Mater Med 2008; 19:2157-2163. [PMID: 18040758 DOI: 10.1007/s10856-007-3307-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2007] [Accepted: 10/08/2007] [Indexed: 05/25/2023]
Abstract
This study dealt with the preparation and characterization of coumarin-6 loaded poly(caprolactone) grafted dextran (PGD) nanoparticles (NPs) and evaluation of cellular uptake by using human gastric cancer cell line (SNU-638), in vitro. The potential application of these PGD NPs for sustained drug delivery was evaluated by the quantification and localization of the cellular uptake of fluorescent PGD NPs. Coumarin-6 loaded PGD NPs were prepared by a modified oil/water emulsion technique and characterized by various physico-chemical methods such as, laser light scattering for particle size and size distribution, atomic force microscopy (AFM), zeta-potential and spectrofluorometry to identify the release of fluorescent molecules from the NPs. SNU-638 was used to measure the cellular uptake of fluorescent PGD NPs. Confocal laser scanning microscopic images clearly showed the internalization of NPs by the SNU-638 cells. Cell viability was assessed by treating the SNU-638 cells with PGD NPs for 48 h. The results reveal, that these biodegradable polymeric NPs holds promise in biomedical field as a carrier.
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Affiliation(s)
- P Prabu
- Department of Bionanosystem Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea
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Affiliation(s)
- P. Viswanathamurthi
- a Department of Chemistry , Bharathiar University , Coimbatore, 641 046, India
| | - N. Dharmaraj
- a Department of Chemistry , Bharathiar University , Coimbatore, 641 046, India
| | - K. Natarajan
- a Department of Chemistry , Bharathiar University , Coimbatore, 641 046, India
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Brayman MJ, Dharmaraj N, Lagow E, Carson DD. MUC1 expression is repressed by protein inhibitor of activated signal transducer and activator of transcription-y. Mol Endocrinol 2007; 21:2725-37. [PMID: 17717071 DOI: 10.1210/me.2006-0539] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Mucin 1 (MUC1) is a transmembrane glycoprotein that modulates the interaction between the embryo and the uterine epithelial cell surface. MUC1 also is a tumor marker and has been implicated in the protection of cancer cells from immune cell attack as well as in cell signaling in some tumors. We and others have shown that MUC1 expression is activated by progesterone (P), TNF-alpha, and interferon-gamma (IFN-gamma). Here we demonstrate that MUC1 expression is down-regulated by overexpression of members of the protein inhibitor of activated signal transducer and activator of transcription (PIAS) family, PIAS1, PIAS3, PIASxalpha, PIASxbeta, and PIASy, in human uterine epithelial cell lines HES and HEC-1A and in a breast cancer cell line, T47D. Treatments with P, TNF-alpha, and IFN-gamma were unable to overcome the repression by PIASy. PIASy repression of basal, P-, and TNF-alpha-stimulated MUC1 promoter activity was not dependent on the PIASy sumoylation domain. In contrast, PIASy suppression of IFN-gamma-activated MUC1 promoter activity was dependent on the PIASy sumoylation domain. PIASy and P receptor B were localized to the nucleus upon P treatment, and small interfering RNA knockdown of PIASy resulted in an increase in P-mediated stimulation of MUC1 protein expression. Overexpression of PIASy did not affect P receptor B binding to the MUC1 promoter but surprisingly led to a loss of nuclear receptor corepressor (NCoR), which was recruited to the promoter in response to P. Collectively, these data indicate that PIASy may be a useful target for down-regulation of MUC1 expression in various contexts.
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Affiliation(s)
- Melissa Jo Brayman
- Department of Reproductive Medicine, University of California, San Diego, School of Medicine, La Jolla, California 92093, USA
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Remant Bahadur K, Bhattarai SR, Aryal S, Khil MS, Dharmaraj N, Kim HY. Novel amphiphilic triblock copolymer based on PPDO, PCL, and PEG: Synthesis, characterization, and aqueous dispersion. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2006.06.009] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Prabu P, Dharmaraj N, Aryal S, Lee BM, Ramesh V, Kim HY. Preparation and drug release activity of scaffolds containing collagen and poly(caprolactone). J Biomed Mater Res A 2006; 79:153-8. [PMID: 16779770 DOI: 10.1002/jbm.a.30715] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A new biodegradable polymeric scaffold was prepared by using collagen and poly(caprolatctone) (PCL). These scaffolds were found to be soft, spongy, and transparent in nature and characterized by thermogravimetric analysis and FTIR spectrum. To these biodegradable polymeric scaffolds, antibiotic drugs namely amikacin and gentamycin were incorporated separately to study their release pattern from scaffolds. Amikacin and gentamycin release activity of the scaffolds containing a constant quantity of collagen but different quantities of PCL were studied at various time intervals viz. 1, 4, 24, and 48 h by measuring the optical density at 257 and 255 nm, respectively.
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Affiliation(s)
- P Prabu
- Department of Bionanosystem Engineering, Chonbuk National University, Chonju 56-756, Republic of Korea
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Affiliation(s)
- N. Dharmaraj
- a Department of Chemistry , Government Arts College , Udumalpet, India
- b Inorganic/Organic Nanomaterials Research Laboratory, Department of Textile Engineering , Chonbuk National University , Chonju, Republic of Korea
| | - C. H. Kim
- b Inorganic/Organic Nanomaterials Research Laboratory, Department of Textile Engineering , Chonbuk National University , Chonju, Republic of Korea
| | - H. Y. Kim
- b Inorganic/Organic Nanomaterials Research Laboratory, Department of Textile Engineering , Chonbuk National University , Chonju, Republic of Korea
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