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Marine Drugs

Yu-Jie Wang, Yu-Yan Li, Xiao-Yu Liu, Xiao-Ling Lu, Xin Cao, Bing-Hua Jiao
Antibody-drug conjugates (ADCs), constructed with monoclonal antibodies (mAbs), linkers, and natural cytotoxins, are innovative drugs developed for oncotherapy. Owing to the distinctive advantages of both chemotherapy drugs and antibody drugs, ADCs have obtained enormous success during the past several years. The development of highly specific antibodies, novel marine toxins' applications, and innovative linker technologies all accelerate the rapid R&D of ADCs. Meanwhile, some challenges remain to be solved for future ADCs...
January 13, 2017: Marine Drugs
Marine Drugs Editorial Office
The editors of Marine Drugs would like to express their sincere gratitude to the following reviewers for assessing manuscripts in 2016. [...].
January 11, 2017: Marine Drugs
Amy E Wright, K Brian Killday, Debopam Chakrabarti, Esther A Guzmán, Dedra Harmody, Peter J McCarthy, Tara Pitts, Shirley A Pomponi, John K Reed, Bracken F Roberts, Carolina Rodrigues Felix, Kyle H Rohde
A deep-water sponge of the genus Spongosorites has yielded a bis-indole alkaloid which we have named dragmacidin G. Dragmacidin G was first reported by us in the patent literature and has recently been reported by Hitora et al. from a sponge of the genus Lipastrotheya. Dragmacidin G is the first in this series of compounds to have a pyrazine ring linking the two indole rings. It also has a rare N-(2-mercaptoethyl)-guanidine side chain. Dragmacidin G shows a broad spectrum of biological activity including inhibition of methicillin-resistant Staphylococcus aureus, Mycobacterium tuberculosis, Plasmodium falciparum, and a panel of pancreatic cancer cell lines...
January 11, 2017: Marine Drugs
Ribang Wu, Leilei Chen, Dan Liu, Jiafeng Huang, Jiang Zhang, Xiao Xiao, Ming Lei, Yuelin Chen, Hailun He
Bacterial extracellular proteases from six strains of marine bacteria and seven strains of terrestrial bacteria were prepared through fermentation. Proteases were analyzed through substrate immersing zymography and used to hydrolyze the collagen and muscle proteins from a salmon skin byproduct, respectively. Collagen could be degraded much more easily than muscle protein, but it commonly showed weaker antioxidant capability. The hydrolysate of muscle proteins was prepared with crude enzymes from Pseudoalteromonas sp...
January 11, 2017: Marine Drugs
Taghreed Alsufyani, Anne Weiss, Thomas Wichard
The marine green macroalga Ulva (Chlorophyta) lives in a mutualistic symbiosis with bacteria that influence growth, development, and morphogenesis. We surveyed changes in Ulva's chemosphere, which was defined as a space where organisms interact with each other via compounds, such as infochemicals, nutrients, morphogens, and defense compounds. Thereby, Ulva mutabilis cooperates with bacteria, in particular, Roseovarius sp. strain MS2 and Maribacter sp. strain MS6 (formerly identified as Roseobacter sp. strain MS2 and Cytophaga sp...
January 10, 2017: Marine Drugs
Haitao Ding, Qian Zeng, Lili Zhou, Yong Yu, Bo Chen
A novel β-1,3-galactosidase, designated as MaBGA (β-galactosidase from Marinomonas sp. BSi20414), was successfully purified to homogeneity from Marinomonas sp. BSi20414 isolated from Arctic sea ice by ammonium sulfate precipitation and anion exchange chromatography, resulting in an 8.12-fold increase in specific activity and 9.9% recovery in total activity. MaBGA displayed its maximum activity at pH 6.0 and 60 °C, and maintained at least 90% of its initial activity over the pH range of 5.0-8.0 after incubating for 1 h...
January 8, 2017: Marine Drugs
Matthew J Bertin, Paul G Wahome, Paul V Zimba, Haiyin He, Peter D R Moeller
In an effort to isolate and characterize bioactive secondary metabolites from Trichodesmium thiebautii blooms, collected cyanobacteria biomass was subjected to bioassay-guided extraction and fractionation using the human colon cancer cell line HCT-116, resulting in the isolation and subsequent structure characterization of a linear polyketide trichophycin A (1). The planar structure of 1 was completed using 1D and 2D NMR spectroscopy and high-resolution electrospray ionization mass spectrometry (HRESIMS). Trichophycin A was moderately toxic against the murine neuroblastoma cell line Neuro-2A (EC50: 6...
January 6, 2017: Marine Drugs
Huawei Zhang, Menglian Dong, Hong Wang, Phillip Crews
Phyllospongia, one of the most common marine sponges in tropical and subtropical oceans, has been shown to be a prolific producer of natural products with a broad spectrum of biological activities. This review for the first time provides a comprehensive overview of secondary metabolites produced by Phyllospongia spp. over the 37 years from 1980 to 2016.
January 6, 2017: Marine Drugs
Yu-Chia Chang, Tsong-Long Hwang, Liang-Mou Kuo, Ping-Jyun Sung
Seven new marine 11-acetoxy-9,11-secosterols, pinnisterols D-J (1-7), with a 1,4-quinone moiety, were discovered from the gorgonian coral Pinnigorgia sp. In this study, the structures of secosterols 1-7 were revealed by spectroscopic analysis. Bioactivity study showed that secosterol 1 treatment inhibited cell viability in a hepatic stellate cell line, HSC-T6, with an IC50 value of 3.93 μM; and secosterols 2, 5, and 7 reduced elastase enzyme release, and 3, 5, and 7 decreased the production of superoxide anions from human neutrophils...
January 6, 2017: Marine Drugs
Yen-You Lin, Yen-Hsuan Jean, Hsin-Pai Lee, Sung-Chun Lin, Chieh-Yu Pan, Wu-Fu Chen, Shu-Fen Wu, Jui-Hsin Su, Kuan-Hao Tsui, Jyh-Horng Sheu, Ping-Jyun Sung, Zhi-Hong Wen
Osteoclasts are multinucleated giant cells of macrophage/monocyte lineage, and cell differentiation with the upregulation of osteoclast-related proteins is believed to play a major role in the destruction of the joints in the course of rheumatoid arthritis (RA). Pro-inflammatory cytokines, such as interleukin-17A (IL-17A) and macrophage colony-stimulating factor (M-CSF), can be overexpressed in RA and lead to osteoclastogenesis. In a previous study, we found that cultured-type soft coral-derived excavatolide B (Exc-B) exhibited anti-inflammatory properties...
January 6, 2017: Marine Drugs
Mingzhi Su, Jiafu Cao, Jin Huang, Sen Liu, Dong Soon Im, Jin-Wook Yoo, Jee H Jung
Previously, the authors found that 4-hydroxy-2-(4-hydroxyphenethyl) isoindoline-1,3-dione (PD1) (a phthalimide analogue) bound to and activated peroxisome proliferator-activated receptor-γ (PPAR-γ). Since PPAR-γ suppresses inflammatory responses, the present study was undertaken to investigate the anti-inflammatory effects of PD1. In lipopolysaccharide (LPS)-stimulated murine RAW264.7 macrophages, PD1 suppressed the inductions of pro-inflammatory factors, including inducible nitric oxide synthase (iNOS), nitric oxide (NO), cyclooxygenase 2 (COX-2), tumor necrosis factor α (TNF-α), interleukin-1β (IL-1β), and interleukin-6 (IL-6)...
January 4, 2017: Marine Drugs
Hafiz Ansar Rasul Suleria, Barney M Hines, Rama Addepalli, Wei Chen, Paul Masci, Glenda Gobe, Simone A Osborne
Waste generated from the processing of marine organisms for food represents an underutilized resource that has the potential to provide bioactive molecules with pharmaceutical applications. Some of these molecules have known anti-thrombotic and anti-coagulant activities and are being investigated as alternatives to common anti-thrombotic drugs, like heparin and warfarin that have serious side effects. In the current study, extracts prepared from blacklip abalone (Haliotis rubra) processing waste, using food grade enzymes papain and bromelain, were found to contain sulphated polysaccharide with anti-thrombotic activity...
December 31, 2016: Marine Drugs
Shangyong Li, Linna Wang, Ximing Xu, Shengxiang Lin, Yuejun Wang, Jianhua Hao, Mi Sun
Metalloproteases are emerging as useful agents in the treatment of many diseases including arthritis, cancer, cardiovascular diseases, and fibrosis. Studies that could shed light on the metalloprotease pharmaceutical applications require the pure enzyme. Here, we reported the structure-based design and synthesis of the affinity medium for the efficient purification of metalloprotease using the 4-aminophenylboronic acid (4-APBA) as affinity ligand, which was coupled with Sepharose 6B via cyanuric chloride as spacer...
December 27, 2016: Marine Drugs
Huda A Wahab, Ngoc B Pham, Tengku S Tengku Muhammad, John N A Hooper, Ronald J Quinn
A study of the chemical constituents from the Australian Sponge Hyrtios digitatus has provided a perspective on the connection between the chemistry and biology of the puupehenones, a unique and unusual class of merosesquiterpenes. In this study, a new tetracyclic merosesquiterpene, 19-methoxy-9,15-ene-puupehenol (1) was isolated from the marine sponge Hyrtios digitatus along with the known 20-methoxy-9,15-ene-puupehenol (2). Their structures were elucidated on the basis of spectroscopic data (¹H and (13)C NMR) in combination with experimental electronic circular dichroism (ECD) data...
December 27, 2016: Marine Drugs
Xixi Cai, Jiaping Lin, Shaoyun Wang
Peptide-calcium can probably be a suitable supplement to improve calcium absorption in the human body. In this study, a specific peptide Phe-Tyr (FY) with calcium-binding capacity was purified from Schizochytrium sp. protein hydrolysates through gel filtration chromatography and reversed phase HPLC. The calcium-binding capacity of FY reached 128.77 ± 2.57 μg/mg. Results of ultraviolet spectroscopy, fluorescence spectroscopy, and infrared spectroscopy showed that carboxyl groups, amino groups, and amido groups were the major chelating sites...
December 27, 2016: Marine Drugs
Li-Ying Ma, De-Sheng Liu, De-Guo Li, Yu-Ling Huang, Hui-Hui Kang, Chun-Hua Wang, Wei-Zhong Liu
Five new pyran rings containing polyketides, penicipyrans A-E (1-5), together with the known pestapyrone A (6), were isolated from the saline soil-derived Penicillium raistrickii. Their structures were determined by interpretation of NMR and HRESIMS data. The absolute configurations of compounds 4 and 5 were established by the modified Mosher's method and single-crystal X-ray diffraction analysis, respectively. These compounds possessed high structural diversity including two α-pyrones (1, 2), three isocoumarins (3, 4, 6), and one dihydropyran derivative (5)...
December 23, 2016: Marine Drugs
Shangyong Li, Linna Wang, Jianhua Hao, Mengxin Xing, Jingjing Sun, Mi Sun
Unsaturated alginate disaccharides (UADs), enzymatically derived from the degradation of alginate polymers, are considered powerful antioxidants. In this study, a new high UAD-producing alginate lyase, AlySY08, has been purified from the marine bacterium Vibrio sp. SY08. AlySY08, with a molecular weight of about 33 kDa and a specific activity of 1070.2 U/mg, showed the highest activity at 40 °C in phosphate buffer at pH 7.6. The enzyme was stable over a broad pH range (6.0-9.0) and retained about 75% activity after incubation at 40 °C for 2 h...
December 23, 2016: Marine Drugs
Zhiwen Li, Xige Yang, Xuesong Song, Haichun Ma, Ping Zhang
Propofol is one of the main sedatives but its negative side effects limit its clinical application. Chitosan oligosaccharide (COS), a kind of natural product with anti-pain and anti-inflammatory activities, may be a potential adjuvant to propofol use. A total of 94 patients receiving surgeries were evenly and randomly assigned to two groups: 10 mg/kg COS oral administration and/or placebo oral administration before being injected with propofol. The target-controlled infusion of propofol was adjusted to maintain the values of the bispectral index at 50...
December 21, 2016: Marine Drugs
Zhihan Zhang, Xitian Min, Junjun Huang, Yue Zhong, Yuehua Wu, Xiaoxia Li, Yinyue Deng, Zide Jiang, Zongze Shao, Lianhui Zhang, Fei He
Cytoglobosins H (1) and I (2), together with seven known cytochalasan alkaloids (3-9), were isolated from the deep-sea-derived fungus Chaetomium globosum. The structures of new compounds 1 and 2 were elucidated by extensive 1D and 2D NMR and mass spectroscopic data. All the compounds were evaluated for their antiproliferative activities against MDA-MB-231 human breast cancer cells, LNCaP human prostate cancer cells, and B16F10 mouse melanoma cells. Compound 6 showed significant antiproliferative activity against LNCaP and B16F10 cell lines with IC50 values of 0...
December 20, 2016: Marine Drugs
Jun-Jie Guo, Lei-Lei Ma, Hong-Tao Shi, Jian-Bing Zhu, Jian Wu, Zhi-Wen Ding, Yi An, Yun-Zeng Zou, Jun-Bo Ge
Doxorubicin (DOX) is a highly potent chemotherapeutic agent, but its usage is limited by dose-dependent cardiotoxicity. DOX-induced cardiotoxicity involves increased oxidative stress and activated endoplasmic reticulum-mediated apoptosis. Alginate oligosaccharide (AOS) is a non-immunogenic, non-toxic and biodegradable polymer, with anti-oxidative, anti-inflammatory and anti-endoplasmic reticulum stress properties. The present study examined whether AOS pretreatment could protect against acute DOX cardiotoxicity, and the underlying mechanisms focused on oxidative stress and endoplasmic reticulum-mediated apoptosis...
December 20, 2016: Marine Drugs
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