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Xiao F, Sun M, Zhang L, Lei X. Investigation of Peptide Labeling with ortho-Phthalaldehyde and 2-Acylbenzaldehyde. J Org Chem 2023. [PMID: 37607402 DOI: 10.1021/acs.joc.3c01397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
ortho-Phthalaldehyde (OPA) with high reactivity to the amine group has been widely used to modify proteins. We discovered new modifications of OPA and 2-acylbenzaldehyde and proposed the reaction mechanism. Using isotope labeling mass spectrometry-based experiment, we identified new cross-linking properties of OPA and 2-acylbenzaldehyde. This reactivity revealed that OPA has the potential to probe proximal amino acids in biological systems.
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Affiliation(s)
- Fan Xiao
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Synthetic and Functional Biomolecules Center, and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
| | - Mengze Sun
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Synthetic and Functional Biomolecules Center, and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
| | | | - Xiaoguang Lei
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Synthetic and Functional Biomolecules Center, and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
- Institute for Cancer Research, Shenzhen Bay Laboratory, Shenzhen, 518107, China
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2
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Marine Cyanobacteria as Sources of Lead Anticancer Compounds: A Review of Families of Metabolites with Cytotoxic, Antiproliferative, and Antineoplastic Effects. Molecules 2022; 27:molecules27154814. [PMID: 35956762 PMCID: PMC9369884 DOI: 10.3390/molecules27154814] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 07/22/2022] [Accepted: 07/24/2022] [Indexed: 02/01/2023] Open
Abstract
The marine environment is highly diverse, each living creature fighting to establish and proliferate. Among marine organisms, cyanobacteria are astounding secondary metabolite producers representing a wonderful source of biologically active molecules aimed to communicate, defend from predators, or compete. Studies on these molecules’ origins and activities have been systematic, although much is still to be discovered. Their broad chemical diversity results from integrating peptide and polyketide synthetases and synthases, along with cascades of biosynthetic transformations resulting in new chemical structures. Cyanobacteria are glycolipid, macrolide, peptide, and polyketide producers, and to date, hundreds of these molecules have been isolated and tested. Many of these compounds have demonstrated important bioactivities such as cytotoxicity, antineoplastic, and antiproliferative activity with potential pharmacological uses. Some are currently under clinical investigation. Additionally, conventional chemotherapeutic treatments include drugs with a well-known range of side effects, making anticancer drug research from new sources, such as marine cyanobacteria, necessary. This review is focused on the anticancer bioactivities of metabolites produced by marine cyanobacteria, emphasizing the identification of each variant of the metabolite family, their chemical structures, and the mechanisms of action underlying their biological and pharmacological activities.
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Schwarting R, Behling E, Allen A, Arguello-Guerra V, Budak-Alpdogan T. CD30+ Lymphoproliferative Disorders as Potential Candidates for CD30-Targeted Therapies. Arch Pathol Lab Med 2022; 146:415-432. [PMID: 35299246 DOI: 10.5858/arpa.2021-0338-ra] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/14/2021] [Indexed: 11/06/2022]
Abstract
CONTEXT.— In the early 1980s, a monoclonal antibody termed Ki-1 was developed against a cell line derived from a patient with Hodgkin lymphoma. This antibody detected a limited number of benign activated lymphocytes in lymphoid tissue, whereas in Hodgkin lymphoma it appeared to be nearly specific for Reed-Sternberg cells and their mononuclear variants. Subsequent studies showed that Ki-1 expression defined a new type of lymphoma that was later designated anaplastic large cell lymphoma with or without anaplastic large cell kinase expression/translocation. In the past 30 years, numerous new lymphoma entities have been defined, many of which are variably positive for CD30. Many virally transformed lymphoproliferative disorders are also frequently positive for CD30. OBJECTIVE.— To illustrate the broad spectrum of CD30+ hematologic malignancies and to provide an update of CD30-targeted therapies. DATA SOURCES.— Personal experiences and published works in PubMed. CONCLUSIONS.— Because of its low expression in normal tissue, CD30 was studied as a therapeutic target for many years. However, the first functional humanized antibody against CD30 was developed only about 10 years ago. Brentuximab vedotin is a humanized anti-CD30 antibody linked to a cytotoxin, and was approved by the US Food and Drug Administration in 2012 for treating refractory Hodgkin lymphoma and anaplastic large cell lymphoma. Since then, the list of Food and Drug Administration-approved CD30-targeted hematologic malignancies has grown. Recently, the therapies using tumor antigen-specific chimeric antigen receptor T cells targeting CD30 have incited a great deal of enthusiasm and are studied in clinical trials.
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Affiliation(s)
- Roland Schwarting
- From the Department of Pathology, Cooper University Hospital and Cooper Medical School of Rowan University, Camden, New Jersey (Schwarting, Behling, Allen, Arguello-Guerra)
| | - Eric Behling
- From the Department of Pathology, Cooper University Hospital and Cooper Medical School of Rowan University, Camden, New Jersey (Schwarting, Behling, Allen, Arguello-Guerra)
| | - Ashleigh Allen
- From the Department of Pathology, Cooper University Hospital and Cooper Medical School of Rowan University, Camden, New Jersey (Schwarting, Behling, Allen, Arguello-Guerra)
| | - Vivian Arguello-Guerra
- From the Department of Pathology, Cooper University Hospital and Cooper Medical School of Rowan University, Camden, New Jersey (Schwarting, Behling, Allen, Arguello-Guerra)
| | - Tulin Budak-Alpdogan
- MD Anderson Cancer Center at Cooper, Department of Medicine, Cooper University Hospital, Cooper Medical School of Rowan University, Camden, New Jersey (Budak-Alpdogan)
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4
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Phycochemistry and bioactivity of cyanobacterial secondary metabolites. Mol Biol Rep 2022; 49:11149-11167. [PMID: 36161579 PMCID: PMC9513011 DOI: 10.1007/s11033-022-07911-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Accepted: 08/31/2022] [Indexed: 11/24/2022]
Abstract
Microbes are a huge contributor to people's health around the world since they produce a lot of beneficial secondary metabolites. Cyanobacteria are photosynthetic prokaryotic bacteria cosmopolitan in nature. Adaptability of cyanobacteria to wide spectrum of environment can be contributed to the production of various secondary metabolites which are also therapeutic in nature. As a result, they are a good option for the development of medicinal molecules. These metabolites could be interesting COVID-19 therapeutic options because the majority of these compounds have demonstrated substantial pharmacological actions, such as neurotoxicity, cytotoxicity, and antiviral activity against HCMV, HSV-1, HHV-6, and HIV-1. They have been reported to produce a single metabolite active against wide spectrum of microbes like Fischerella ambigua produces ambigols active against bacteria, fungi and protozoa. Similarly, Moorea producens produces malygomides O and P, majusculamide C and somocystinamide which are active against bacteria, fungi and tumour cells, respectively. In addition to the above, Moorea sp. produce apratoxin A and dolastatin 15 possessing anti cancerous activity but unfortunately till date only brentuximab vedotin (trade name Adcetris), a medication derived from marine peptides, for the treatment of Hodgkin lymphoma and anaplastic large cell lymphoma has been approved by FDA. However, several publications have effectively described and categorised cyanobacterial medicines based on their biological action. In present review, an effort is made to categorize cyanobacterial metabolites on the basis of their phycochemistry. The goal of this review is to categorise cyanobacterial metabolites based on their chemical functional group, which has yet to be described.
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5
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Morais-Perdigão AL, Rodrigues-Fernandes CI, Araújo GR, Soares CD, de Andrade BAB, Martins MD, Vargas PA, Pontes HAR, Pires FR, Burbano RMR, Fonseca FP. CD30 Expression in Oral and Oropharyngeal Diffuse Large B Cell Lymphoma, not Otherwise Specified. Head Neck Pathol 2021; 16:476-485. [PMID: 34655411 PMCID: PMC9187795 DOI: 10.1007/s12105-021-01387-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 10/06/2021] [Indexed: 12/24/2022]
Abstract
Diffuse large B cell lymphoma, not otherwise specified (DLBCL, NOS) is the most frequent non-Hodgkin lymphoma subtype. This aggressive neoplasm may variably express the CD30 protein, which may be used as a therapeutic target for this tumor. However, CD30 expression in DLBCL NOS arising from the oral cavity and the oropharynx has not been investigated. Therefore, this study aims to determine the frequency of CD30 expression and its prognostic significance for patients affected by oral/oropharyngeal DLBCL NOS. Fifty cases were retrieved from pathology files and submitted to immunohistochemistry against CD30. Reactivity was accessed by two oral pathologists using two cut-off values (> 0% and > 20% of tumor cells) to determine positivity in each case. Clinical data were obtained from the patients' medical files to investigate the prognostic potential of the protein. Seven high-grade B cell lymphomas and two EBV-positive DLBCL NOS were identified. We found one CD30-positive case in each of these two groups of lymphomas. Among the remaining 41 DLBCL NOS, other four cases (three in the oral cavity and one in the oropharynx) were positive for CD30, but only two expressed the protein in > 20% of tumor cells, both in the oral cavity. Survival analysis demonstrated that CD30-positive cases had a higher five-year overall survival rate (75%) than CD30-negative cases (32.3%), although a statistically significant result was not achieved (p = 0.19). Only a minor subset of oral and oropharyngeal DLBCL NOS express CD30 and these patients seems to have a higher survival rate.
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Affiliation(s)
- Ana Luísa Morais-Perdigão
- Department of Oral Surgery and Pathology, School of Dentistry, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, 31270-901, Pampulha, Belo Horizonte, Brazil
| | | | - Gabriela Ribeiro Araújo
- Department of Oral Surgery and Pathology, School of Dentistry, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, 31270-901, Pampulha, Belo Horizonte, Brazil
| | | | | | - Manoela Domingues Martins
- Department of Pathology, School of Dentistry, Federal University of Rio Grande Do Sul, Porto Alegre, Brazil
| | - Pablo Agustin Vargas
- Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil ,Department of Oral Biology and Oral Pathology, University of Pretoria, Pretoria, South Africa
| | - Hélder Antônio Rebelo Pontes
- Service of Oral Pathology, João de Barros, Barreto University Hospital, Federal University of Pará, Belem, Brazil
| | - Fábio Ramôa Pires
- Oral Pathology, Dental School, Rio de Janeiro State University, Rio de Janeiro, Brazil
| | | | - Felipe Paiva Fonseca
- Department of Oral Surgery and Pathology, School of Dentistry, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, 31270-901, Pampulha, Belo Horizonte, Brazil ,Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil ,Department of Oral Biology and Oral Pathology, University of Pretoria, Pretoria, South Africa
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6
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Milan E, Miceli P, Sernicola A, Finotto S, Marino D, Alaibac M. Complete remission of primary cutaneous anaplastic large cell lymphoma after a short course of brentuximab vedotin. Mol Clin Oncol 2021; 14:121. [PMID: 33936594 DOI: 10.3892/mco.2021.2283] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 02/15/2021] [Indexed: 12/31/2022] Open
Abstract
Primary cutaneous anaplastic large cell lymphoma (PCALCL) is a rare CD30+ lymphoproliferative disorder characterized by the development of lesions ranging from papules to large tumors. Most cases present as localized disease, however multifocal and generalized involvement of the skin can occur. Several treatments have been proposed for PCALCL; however a highly effective standard approach to multifocal disease has not yet been elucidated. The disease expression of CD30 antigen in at least 75% of the tumor makes it an optimal target for immunotherapy. The current study presents a case of a 62-year-old male referred to the University of Padua Dermatology Clinic complaining about nodular and ulcerated lesions involving the frontal area and scalp that were 8 cm in diameter. Doses of 180 mg brentuximab vedotin (BV), which is an antibody drug conjugate binding CD30 antigen, were administered every 21 days. A 75% decrease in dimensions after the first infusion and a complete remission after the second was observed. Disease response appeared to be dose-related and adverse reactions, in particular peripheral neuropathy, may be an effect of cumulative toxicity, meaning that treatment cycle reduction should be considered. Based on the present results, A high dose, short course of BV is recommended as a cost-effective approach for PCALCL. However, further studies are required to assess the efficacy and other potential advantages of this therapeutic regimen.
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Affiliation(s)
- Elisa Milan
- Unit of Dermatology, University of Padua, Padova I-35128, Italy
| | - Paola Miceli
- Unit of Dermatology, University of Padua, Padova I-35128, Italy
| | | | - Silvia Finotto
- Unit of Medical Oncology 1, Veneto Institute of Oncology IOV-IRCCS, Padova I-35128, Italy
| | - Dario Marino
- Unit of Medical Oncology 1, Veneto Institute of Oncology IOV-IRCCS, Padova I-35128, Italy
| | - Mauro Alaibac
- Unit of Dermatology, University of Padua, Padova I-35128, Italy
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Salomon PL, Reid EE, Archer KE, Harris L, Maloney EK, Wilhelm AJ, Miller ML, Chari RVJ, Keating TA, Singh R. Optimizing Lysosomal Activation of Antibody–Drug Conjugates (ADCs) by Incorporation of Novel Cleavable Dipeptide Linkers. Mol Pharm 2019; 16:4817-4825. [DOI: 10.1021/acs.molpharmaceut.9b00696] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Paulin L. Salomon
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Emily E. Reid
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Katie E. Archer
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Luke Harris
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Erin K. Maloney
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Alan J. Wilhelm
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Michael L. Miller
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Ravi V. J. Chari
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Thomas A. Keating
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Rajeeva Singh
- ImmunoGen, Inc., 830 Winter Street, Waltham, Massachusetts 02451, United States
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8
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Liang Y, Wang Y, Xiao M, Hao Y, Zhang Y, Li S. Tumor necrosis factor receptor 2 may promote the proliferation and drug resistance of Kapras299 and L428 lymphoma cells via the AKT and WNT/β-catenin signaling pathways. Oncol Lett 2018; 15:8847-8852. [PMID: 29928327 DOI: 10.3892/ol.2018.8396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 10/18/2017] [Indexed: 02/06/2023] Open
Abstract
Circulating soluble tumor necrosis factor receptor 2 (sTNFR2) has been associated with a relatively poor prognosis in various types of lymphoma. However, the specific role of TNFR2 expression in lymphoma cells remains uncharacterized. In the present study, TNFR2 expression was quantified in the Hodgkin lymphoma cell line, L428, and the anaplastic large-cell lymphoma cell line, Karpas299, using RT-PCR and western blot analyses. Karpas299 cells exhibited higher TNFR2 expression than L428 cells. Proliferation and drug resistance experiments demonstrated that Karpas299 cells also possessed a greater proliferative ability and resistance to adriamycin (ADM) than L428 cells, with 50% inhibitory concentrations (IC50) of 1.423±0.24 µmol/l for Karpas299 cells, compared with 0.728±0.15 µmol/l for L428 cells (P<0.05). The knockdown of TNFR2 in Karpas299 cells significantly reduced their proliferative ability; when treated with ADM, the cell inhibition rate increased from 49.34±5.42% to 74.13±6.81% (P<0.05). The upregulation of TNFR2 in L428 cells significantly increased their proliferative ability; when treated with ADM, the cell inhibition rate decreased from 47.03±5.25% to 28.71±4.90% (P<0.05). Investigation of the underlying molecular mechanism indicated that the upregulation of TNFR2 expression in L428 cells increased the expression of β-catenin and the phosphorylation of AKT. In L428 cells overexpressing TNFR2, the β-catenin blocker, DKK1, or the AKT inhibitor, LY294002, abrogated the increase in proliferation induced by TNFR2 and increased cell inhibition rate upon treatment with ADM. In summary, the present study demonstrated that TNFR2 promoted the proliferative and drug resistance abilities of lymphoma cells via the AKT and WNT/β-catenin signaling pathways. This may provide the experimental basis for the further study of TNFR2 activity in lymphoma cells and warrant its investigation as a therapeutic target for lymphoma.
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Affiliation(s)
- Yanyan Liang
- Department of Hematology, First People's Hospital of Jining City, Jining, Shandong 257335, P.R. China
| | - Yu Wang
- Department of Medicine 11, People's Hospital of Xintai City, Tai'an, Shandong 271200, P.R. China
| | - Meng Xiao
- Department of Hematology, First People's Hospital of Jining City, Jining, Shandong 257335, P.R. China
| | - Yunliang Hao
- Department of Hematology, First People's Hospital of Jining City, Jining, Shandong 257335, P.R. China
| | - Yongtian Zhang
- Department of Hematology, First People's Hospital of Jining City, Jining, Shandong 257335, P.R. China
| | - Shumei Li
- Department of Hematology, First People's Hospital of Jining City, Jining, Shandong 257335, P.R. China
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9
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Therapeutic Properties and Biological Benefits of Marine-Derived Anticancer Peptides. Int J Mol Sci 2018; 19:ijms19030919. [PMID: 29558431 PMCID: PMC5877780 DOI: 10.3390/ijms19030919] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 03/07/2018] [Accepted: 03/16/2018] [Indexed: 01/01/2023] Open
Abstract
Various organisms exist in the oceanic environment. These marine organisms provide an abundant source of potential medicines. Many marine peptides possess anticancer properties, some of which have been evaluated for treatment of human cancer in clinical trials. Marine anticancer peptides kill cancer cells through different mechanisms, such as apoptosis, disruption of the tubulin-microtubule balance, and inhibition of angiogenesis. Traditional chemotherapeutic agents have side effects and depress immune responses. Thus, the research and development of novel anticancer peptides with low toxicity to normal human cells and mechanisms of action capable of avoiding multi-drug resistance may provide a new method for anticancer treatment. This review provides useful information on the potential of marine anticancer peptides for human therapy.
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10
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Shah SAA, Akhter N, Auckloo BN, Khan I, Lu Y, Wang K, Wu B, Guo YW. Structural Diversity, Biological Properties and Applications of Natural Products from Cyanobacteria. A Review. Mar Drugs 2017; 15:md15110354. [PMID: 29125580 PMCID: PMC5706043 DOI: 10.3390/md15110354] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 11/01/2017] [Accepted: 11/03/2017] [Indexed: 12/26/2022] Open
Abstract
Nowadays, various drugs on the market are becoming more and more resistant to numerous diseases, thus declining their efficacy for treatment purposes in human beings. Antibiotic resistance is one among the top listed threat around the world which eventually urged the discovery of new potent drugs followed by an increase in the number of deaths caused by cancer due to chemotherapy resistance as well. Accordingly, marine cyanobacteria, being the oldest prokaryotic microorganisms belonging to a monophyletic group, have proven themselves as being able to generate pharmaceutically important natural products. They have long been known to produce distinct and structurally complex secondary metabolites including peptides, polyketides, alkaloids, lipids, and terpenes with potent biological properties and applications. As such, this review will focus on recently published novel compounds isolated from marine cyanobacteria along with their potential bioactivities such as antibacterial, antifungal, anticancer, anti-tuberculosis, immunosuppressive and anti-inflammatory capacities. Moreover, various structural classes, as well as their technological uses will also be discussed.
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Affiliation(s)
| | - Najeeb Akhter
- Ocean College, Zhejiang University, Hangzhou 310058, China.
| | | | - Ishrat Khan
- Ocean College, Zhejiang University, Hangzhou 310058, China.
| | - Yanbin Lu
- Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou 310012, China.
| | - Kuiwu Wang
- Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou 310012, China.
| | - Bin Wu
- Ocean College, Zhejiang University, Hangzhou 310058, China.
| | - Yue-Wei Guo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.
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11
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Pulte D, Weberpals J, Jansen L, Luttmann S, Holleczek B, Nennecke A, Ressing M, Katalinic A, Brenner H, Geiss K, Meyer M, Eberle A, Luttmann S, Stabenow R, Hentschel S, Nennecke A, Kieschke J, Sirri E, Holleczek B, Emrich K, Kajüter H, Mattauch V, Katalinic A, Eisemann N, Barnes B, Kraywinkel K, Brenner H, Jansen L, Weberpals J. Survival for patients with rare haematologic malignancies: Changes in the early 21st century. Eur J Cancer 2017; 84:81-87. [DOI: 10.1016/j.ejca.2017.07.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 07/06/2017] [Accepted: 07/11/2017] [Indexed: 11/15/2022]
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12
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Abstract
Through years of evolutionary selection pressures, organisms have developed potent toxins that coincidentally have marked antineoplastic activity. These natural products have been vital for the development of multiagent treatment regimens currently employed in cancer chemotherapy, and are used in the treatment of a variety of malignancies. Therefore, this review catalogs recent advances in natural product-based drug discovery via the examination of mechanisms of action and available clinical data to highlight the utility of these novel compounds in the burgeoning age of precision medicine. The review also highlights the recent development of antibody-drug conjugates and other immunotoxins, which are capable of delivering highly cytotoxic agents previously deemed too toxic to elicit therapeutic benefit preferentially to neoplastic cells. Finally, the review examines natural products not currently used in the clinic that have novel mechanisms of action, and may serve to supplement current chemotherapeutic protocols.
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13
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Preparation and Antitumor Activity of CS5931, A Novel Polypeptide from Sea Squirt Ciona Savignyi. Mar Drugs 2016; 14:md14030047. [PMID: 27007382 PMCID: PMC4820301 DOI: 10.3390/md14030047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2015] [Revised: 02/26/2016] [Accepted: 02/29/2016] [Indexed: 11/16/2022] Open
Abstract
CS5931 is a novel anticancer agent isolated from the sea squirt Ciona savignyi. However, its content in the species is very low, and developing a novel approach for production of the polypeptide is promising. In the present study, we expressed and purified the polypeptide from E. coli, and the fermentation conditions were studied using response surface methodology. The yield of CS5931 was increased from 2.0 to 7.5 mg/L. The denaturing and renaturation conditions were also studied. Using the optimized renaturation condition, the anticancer activity of refolding CS5931 was increased significantly; the value of IC50 was decreased from 23.2 to 11.6 μM. In vivo study using xenograft nude mice bearing HCT116 cancer cells revealed that CS5931 was able to inhibit the growth of tumor significantly. The study provides a useful approach for obtaining enough amount of CS5931 for further study. This study is also important for developing the polypeptide as a novel anticancer agent.
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14
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Peters C, Brown S. Antibody-drug conjugates as novel anti-cancer chemotherapeutics. Biosci Rep 2015; 35:e00225. [PMID: 26182432 PMCID: PMC4613712 DOI: 10.1042/bsr20150089] [Citation(s) in RCA: 287] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 05/18/2015] [Accepted: 05/29/2015] [Indexed: 12/19/2022] Open
Abstract
Over the past couple of decades, antibody-drug conjugates (ADCs) have revolutionized the field of cancer chemotherapy. Unlike conventional treatments that damage healthy tissues upon dose escalation, ADCs utilize monoclonal antibodies (mAbs) to specifically bind tumour-associated target antigens and deliver a highly potent cytotoxic agent. The synergistic combination of mAbs conjugated to small-molecule chemotherapeutics, via a stable linker, has given rise to an extremely efficacious class of anti-cancer drugs with an already large and rapidly growing clinical pipeline. The primary objective of this paper is to review current knowledge and latest developments in the field of ADCs. Upon intravenous administration, ADCs bind to their target antigens and are internalized through receptor-mediated endocytosis. This facilitates the subsequent release of the cytotoxin, which eventually leads to apoptotic cell death of the cancer cell. The three components of ADCs (mAb, linker and cytotoxin) affect the efficacy and toxicity of the conjugate. Optimizing each one, while enhancing the functionality of the ADC as a whole, has been one of the major considerations of ADC design and development. In addition to these, the choice of clinically relevant targets and the position and number of linkages have also been the key determinants of ADC efficacy. The only marketed ADCs, brentuximab vedotin and trastuzumab emtansine (T-DM1), have demonstrated their use against both haematological and solid malignancies respectively. The success of future ADCs relies on improving target selection, increasing cytotoxin potency, developing innovative linkers and overcoming drug resistance. As more research is conducted to tackle these issues, ADCs are likely to become part of the future of targeted cancer therapeutics.
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Affiliation(s)
- Christina Peters
- School of Life Sciences, Nottingham Medical School, Queen's Medical Centre, Nottingham NG7 2UH, U.K
| | - Stuart Brown
- School of Life Sciences, Nottingham Medical School, Queen's Medical Centre, Nottingham NG7 2UH, U.K.
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15
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Chen R, Chen B. Brentuximab vedotin for relapsed or refractory Hodgkin's lymphoma. DRUG DESIGN DEVELOPMENT AND THERAPY 2015; 9:1729-33. [PMID: 25848209 PMCID: PMC4376183 DOI: 10.2147/dddt.s82007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Brentuximab vedotin is a promising antibody-drug conjugate (ADC) targeting CD30 of tumor cells. It selectively delivers monomethyl auristatin E (MMAE) into CD30-expressing cells and induces tumor cell apoptosis. Various clinical trials have provided evidence that it is effective in relapsed or refractory Hodgkin's lymphoma (HL), and it has also shown its advantages in other CD30-positive lymphomas. In this review, we focus on the structure, mechanisms, and pharmacokinetics of brentuximab vedotin. We also summarize clinical trials with brentuximab vedotin and make recommendations for brentuximab vedotin in the treatment of relapsed or refractory HL.
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Affiliation(s)
- Runzhe Chen
- Department of Hematology and Oncology (Key Department of Jiangsu Medicine), Zhongda Hospital, Medical School, Southeast University, Nanjing, Jiangsu Province, People's Republic of China
| | - Baoan Chen
- Department of Hematology and Oncology (Key Department of Jiangsu Medicine), Zhongda Hospital, Medical School, Southeast University, Nanjing, Jiangsu Province, People's Republic of China
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Application of Pharmacokinetic-Pharmacodynamic Modeling and Simulation for Antibody-Drug Conjugate Development. Pharm Res 2015; 32:3508-25. [PMID: 25666843 DOI: 10.1007/s11095-015-1626-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Accepted: 01/12/2015] [Indexed: 10/24/2022]
Abstract
Characterization and prediction of the pharmacokinetics (PK) and pharmacodynamics (PD) of Antibody-Drug Conjugates (ADCs) is challenging, since it requires simultaneous quantitative understanding about the PK-PD properties of three different molecular species i.e., the monoclonal antibody, the drug, and the conjugate. Mathematical modeling and simulation provides an excellent tool to overcome these challenges, as it can simultaneously integrate the PK-PD of ADCs and their components in a quantitative manner. Additionally, the computational PK-PD models can also serve as a cornerstone for the model-based drug development and preclinical-to-clinical translation of ADCs. To provide an overview of this subject matter, this manuscript reviews the PK-PD models applicable to ADCs. Additionally, the usage of these models during different drug development stages (i.e., discovery, preclinical development, and clinical development) is also emphasized. The importance of PK-PD modeling and simulation in making rationale go/no-go decisions throughout the drug development process is also highlighted. There is an array of PK-PD models available, ranging from the systems models specifically developed for ADCs to the empirical models applicable to all chemotherapeutic agents, which one can employ for ADCs. The decision about which model to choose depends on the questions to be answered, time at hand, and resources available.
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Abstract
Antibody-drug conjugates (ADCs) represent a promising therapeutic modality for the clinical management of cancer. The recent approvals of brentuximab vedotin and ado-trastuzumab emtansine plus emerging data for many molecules in clinical trials highlight the potential for ADCs to offer new therapeutic options for patients. Currently, more than 30 ADCs are being evaluated in early- or late-stage clinical trials. Accordingly, much has been done to refine and transform the early-generation ADCs to the highly effective products that we now have in clinical development. These changes include a better understanding of optimal target selection, advances in antibody engineering, improvements in linker/payload conjugation strategies, and the generation of highly potent ADC payloads. In this review, we detail the current status of ADCs in both preclinical and clinical development, highlight technological advancements in ADC development, and speculate towards the future of this targeted therapeutic platform.
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Affiliation(s)
- Fiona Mack
- Oncology Research Unit, World Wide Research and Development, Pfizer Inc, Pearl River, NY
| | - Michael Ritchie
- Oncology Research Unit, World Wide Research and Development, Pfizer Inc, Pearl River, NY
| | - Puja Sapra
- Oncology Research Unit, World Wide Research and Development, Pfizer Inc, Pearl River, NY.
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18
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Ganjoo K, Hong F, Horning SJ, Gascoyne RD, Natkunam Y, Swinnen LJ, Habermann TM, Kahl BS, Advani RH. Bevacizumab and cyclosphosphamide, doxorubicin, vincristine and prednisone in combination for patients with peripheral T-cell or natural killer cell neoplasms: an Eastern Cooperative Oncology Group study (E2404). Leuk Lymphoma 2014; 55:768-72. [PMID: 23786456 PMCID: PMC3872505 DOI: 10.3109/10428194.2013.816700] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Peripheral T-cell lymphoma (PTCL) and natural killer (NK) cell lymphoma have poor survival with conventional cytotoxic chemotherapy. Because angiogenesis plays an important role in the biology of PTCL, a fully humanized anti-vascular endothelial growth factor (VEGF) antibody, bevacizumab (A), was studied in combination with standard cyclosphosphamide, doxorubicin, vincristine and prednisone (CHOP) chemotherapy (ACHOP) to evaluate its potential to improve outcome in these patients. Patients were treated with 6-8 cycles of ACHOP followed by eight doses of maintenance A (15 mg/kg every 21 days). Forty-six patients were enrolled on this phase 2 study from July 2006 through March 2009. Forty-four patients were evaluable for toxicity and 39 were evaluable for response, progression and survival. A total of 324 cycles (range: 2-16, median 7) were administered to 39 evaluable patients and only nine completed all planned treatment. The overall response rate was 90% with 19 (49%) complete response/complete response unconfirmed (CR/CRu) and 16 (41%) a partial response (PR). The 1-year progression-free survival (PFS) rate was 44% at a median follow-up of 3 years. The median PFS and overall survival (OS) rates were 7.7 and 22 months, respectively. Twenty-three patients died (21 from lymphoma, two while in remission). Grade 3 or 4 toxicities included febrile neutropenia (n = 8), anemia (n = 3), thrombocytopenia (n = 5), congestive heart failure (n = 4), venous thrombosis (n = 3), gastrointestinal hemorrhage/perforation (n = 2), infection (n = 8) and fatigue (n = 6). Despite a high overall response rate, the ACHOP regimen failed to result in durable remissions and was associated with significant toxicities. Studies of novel therapeutics are needed for this patient population, whose clinical outcome remains poor.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Antibodies, Monoclonal, Humanized/administration & dosage
- Antineoplastic Combined Chemotherapy Protocols/adverse effects
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- Bevacizumab
- Cyclophosphamide/administration & dosage
- Doxorubicin/administration & dosage
- Female
- Humans
- Killer Cells, Natural/pathology
- Lymphoma, T-Cell, Peripheral/diagnosis
- Lymphoma, T-Cell, Peripheral/drug therapy
- Lymphoma, T-Cell, Peripheral/mortality
- Male
- Middle Aged
- Neoplasm Staging
- Prednisone/administration & dosage
- Treatment Outcome
- Vincristine/administration & dosage
- Young Adult
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19
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Bauer A, Brönstrup M. Industrial natural product chemistry for drug discovery and development. Nat Prod Rep 2014; 31:35-60. [DOI: 10.1039/c3np70058e] [Citation(s) in RCA: 163] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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20
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Loss of Foxp3 Is Associated With CD30 Expression in the Anaplastic Large Cell Subtype of Adult T-cell Leukemia/Lymphoma (ATLL) in US/Caribbean Patients. Am J Surg Pathol 2013; 37:1407-12. [DOI: 10.1097/pas.0b013e31828f2322] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Tan LT, Okino T, Gerwick WH. Bouillonamide: a mixed polyketide-peptide cytotoxin from the marine cyanobacterium Moorea bouillonii. Mar Drugs 2013; 11:3015-24. [PMID: 23966034 PMCID: PMC3766879 DOI: 10.3390/md11083015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 07/10/2013] [Accepted: 07/30/2013] [Indexed: 11/16/2022] Open
Abstract
The tropical marine cyanobacterium, Moorea bouillonii, has gained recent attention as a rich source of bioactive natural products. Continued chemical investigation of this cyanobacterium, collected from New Britain, Papua New Guinea, yielded a novel cytotoxic cyclic depsipeptide, bouillonamide (1), along with previously reported molecules, ulongamide A and apratoxin A. Planar structure of bouillonamide was established by extensive 1D and 2D NMR experiments, including multi-edited HSQC, TOCSY, HBMC, and ROESY experiments. In addition to the presence of α-amino acid residues, compound 1 contained two unique polyketide-derived moieties, namely a 2-methyl-6-methylamino-hex-5-enoic acid (Mmaha) residue and a unit of 3-methyl-5-hydroxy-heptanoic acid (Mhha). Absolute stereochemistry of the α-amino acid units in bouillonamide was determined mainly by Marfey’s analysis. Compound 1 exhibited mild toxicity with IC50’s of 6.0 µM against the neuron 2a mouse neuroblastoma cells.
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Affiliation(s)
- Lik Tong Tan
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, 637616, Singapore
- Authors to whom correspondence should be addressed; E-Mails: (L.T.T.); (W.H.G.); Tel.: +65-679-038-42 (L.T.T.); +1-858-534-0578 (W.H.G.); Fax: +65-689-694-14 (L.T.T.); +1-858-534-0529 (W.H.G.)
| | - Tatsufumi Okino
- Division of Environmental Materials Science, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan; E-Mail:
| | - William H. Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093, USA
- Authors to whom correspondence should be addressed; E-Mails: (L.T.T.); (W.H.G.); Tel.: +65-679-038-42 (L.T.T.); +1-858-534-0578 (W.H.G.); Fax: +65-689-694-14 (L.T.T.); +1-858-534-0529 (W.H.G.)
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22
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Zheng L, Lin X, Wu N, Liu M, Zheng Y, Sheng J, Ji X, Sun M. Targeting cellular apoptotic pathway with peptides from marine organisms. Biochim Biophys Acta Rev Cancer 2013; 1836:42-8. [PMID: 23470652 DOI: 10.1016/j.bbcan.2013.02.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Revised: 02/17/2013] [Accepted: 02/19/2013] [Indexed: 01/15/2023]
Abstract
Apoptosis is a critical defense mechanism against the formation and progression of cancer and exhibits distinct morphological and biochemical traits. Targeting apoptotic pathways becomes an intriguing strategy for the development of chemotherapeutic agents. Peptides from marine organisms have become important sources in the discovery of antitumor drugs, especially when modern technology makes it more and more feasible to collect organisms from seas. This primer summarizes several marine peptides, based on their effects on apoptotic signaling pathways, although most of these peptides have not yet been studied in depth for their mechanisms of action. Novel peptides that induce an apoptosis signal pathway are presented in association with their pharmacological properties.
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Affiliation(s)
- Lanhong Zheng
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China
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23
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Koshkaryev A, Sawant R, Deshpande M, Torchilin V. Immunoconjugates and long circulating systems: origins, current state of the art and future directions. Adv Drug Deliv Rev 2013; 65:24-35. [PMID: 22964425 DOI: 10.1016/j.addr.2012.08.009] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 08/15/2012] [Accepted: 08/22/2012] [Indexed: 12/31/2022]
Abstract
Significant progress has been made recently in the area of immunoconjugated drugs and drug delivery systems (DDS). The immuno-modification of either the drug or DDS has proven to be a very promising approach that has significantly improved the targeted accumulation in pathological sites while decreasing its undesirable side effects in healthy tissues. The arrangement for both prolonged life in the circulation and specific target recognition represents another potent strategy in the development of immuno-targeted systems. The longevity of immuno-targeted DDS such as immunoliposomes and immunomicelles improves their targetability even in the presence of the additional passive accumulation in areas with a compromised vasculature. The added use of the immuno-targeted systems takes advantage of the specific microenvironment of pathological sites including lowered pH, increased temperature, and variation in the enzymatic activity. "Smart" stimulus-responsive systems combine different valuable functionalities including PEG-protection, targeting antibody, cell-penetration, and stimulus-sensitive functions. In this review we examined the evolution, current status and future directions in the area of therapeutical immunoconjugates and long-circulating immuno-targeted DDS.
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Affiliation(s)
- Alexander Koshkaryev
- Center for Pharmaceutical Biotechnology & Nanomedicine, Northeastern University, Boston, MA 02115, USA
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24
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Abstract
Biological therapies play an increasing role in cancer treatment, although the number of naked antibodies showing clinical efficacy as single agent remains limited. One way to enhance therapeutic potential of antibodies is to conjugate them to small molecule drugs. This combination is expected to bring together the benefits of highly potent drugs on the one hand and selective binders of specific tumor antigens on the other hand. However, designing an ADC is more complex than a simple meccano game, requiring thoughtful combination of antibody, linker, and drugs in the context of a target and a defined cancer indication. Lessons learned from the first-generation antibody-drug conjugate (ADC) and improvement of the technology guided the design of improved compounds which are now in clinical trials. Brentuximab vedotin (Adcetris(®)), an anti-CD30 antibody conjugated to a potent microtubule inhibitor for the treatment of Hodgkin's lymphoma and anaplastic large cell lymphomas, is the only marketed ADC today. A total of 27 ADC are currently undergoing clinical trials in both hematological malignancies and solid tumor indications. Among them, T-DM1 (trastuzumab emtansine), an ADC comprised of trastuzumab conjugated to DM1, via a non-cleavable linker, is showing very promising results in phase III for the treatment of HER2-positive refractory/relapsed metastatic breast cancer. Other compounds, such as CMC-544, SAR3419, CDX-011, PSMA-ADC, BT-062, and IMGN901 currently in clinical trials, targeting varied antigens and bearing different linker and drugs, contribute to the learning curve of ADC, as do the discontinued ADC. Current challenges include improvement of the therapeutic index, linked to a careful selection of the targets, a better understanding of ADC mechanism of action, the management and understanding of ADC off-target toxicities, as well as the selection of appropriate clinical settings (patient selection, dosing regimen) where these molecules can bring highest clinical benefit.
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25
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Production of unique immunotoxin cancer therapeutics in algal chloroplasts. Proc Natl Acad Sci U S A 2012; 110:E15-22. [PMID: 23236148 DOI: 10.1073/pnas.1214638110] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The idea of targeted therapy, whereby drug or protein molecules are delivered to specific cells, is a compelling approach to treating disease. Immunotoxins are one such targeted therapeutic, consisting of an antibody domain for binding target cells and molecules of a toxin that inhibits the proliferation of the targeted cell. One major hurdle preventing these therapies from reaching the market has been the lack of a suitable production platform that allows the cost-effective production of these highly complex molecules. The chloroplast of the green alga Chlamydomonas reinhardtii has been shown to contain the machinery necessary to fold and assemble complex eukaryotic proteins. However, the translational apparatus of chloroplasts resembles that of a prokaryote, allowing them to accumulate eukaryotic toxins that otherwise would kill a eukaryotic host. Here we show expression and accumulation of monomeric and dimeric immunotoxin proteins in algal chloroplasts. These fusion proteins contain an antibody domain targeting CD22, a B-cell surface epitope, and the enzymatic domain of exotoxin A from Pseudomonas aeruginosa. We demonstrated that algal-produced immunotoxins accumulate as soluble and enzymatically active proteins that bind target B cells and efficiently kill them in vitro. We also show that treatment with either the mono- or dimeric immunotoxins significantly prolongs the survival of mice with implanted human B-cell tumors.
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26
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Tripathi A, Fang W, Leong DT, Tan LT. Biochemical studies of the lagunamides, potent cytotoxic cyclic depsipeptides from the marine cyanobacterium Lyngbya majuscula. Mar Drugs 2012; 10:1126-1137. [PMID: 22822361 PMCID: PMC3397452 DOI: 10.3390/md10051126] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 05/09/2012] [Accepted: 05/10/2012] [Indexed: 01/08/2023] Open
Abstract
Lagunamides A (1) and B (2) are potent cytotoxic cyclic depsipeptides isolated from the filamentous marine cyanobacterium, Lyngbya majuscula, from Pulau Hantu, Singapore. These compounds are structurally related to the aurilide-class of molecules, which have been reported to possess exquisite antiproliferative activities against cancer cells. The present study presents preliminary findings on the selectivity of lagunamides against various cancer cell lines as well as their mechanism of action by studying their effects on programmed cell death or apoptosis. Lagunamide A exhibited a selective growth inhibitory activity against a panel of cancer cell lines, including P388, A549, PC3, HCT8, and SK-OV3 cells, with IC50 values ranging from 1.6 nM to 6.4 nM. Morphological studies showed blebbing at the surface of cancer cells as well as cell shrinkage accompanied by loss of contact with the substratum and neighboring cells. Biochemical studies using HCT8 and MCF7 cancer cells suggested that the cytotoxic effect of 1 and 2 might act via induction of mitochondrial mediated apoptosis. Data presented in this study warrants further investigation on the mode of action and underscores the importance of the lagunamides as potential anticancer agents.
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Affiliation(s)
- Ashootosh Tripathi
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, 637616, Singapore;
| | - Wanru Fang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, 117576, Singapore;
| | - David Tai Leong
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, 117576, Singapore;
- Authors to whom correspondence should be addressed; (D.T.L.); (L.T.T.); Tel.: +65-6516-7262 (D.T.L.); +65-6790-3842 (L.T.T.); Fax: +65-6779-1936 (D.T.L.); +65-6896-9414 (L.T.T.)
| | - Lik Tong Tan
- Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, 637616, Singapore;
- Authors to whom correspondence should be addressed; (D.T.L.); (L.T.T.); Tel.: +65-6516-7262 (D.T.L.); +65-6790-3842 (L.T.T.); Fax: +65-6779-1936 (D.T.L.); +65-6896-9414 (L.T.T.)
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