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Effect of some biological factors on the chitin yield of two crustacean species inhabiting the Egyptian waters

Journal of Coastal Life Medicine 2017年第11期5卷 463-467页

作者： amira talaat abo-hashesh Wafaa Said Sallam Fedekar Fadel Madkour Hanaa Khalil Ashour Amro Mohamed Hanora Biotechnology Institute for Postgraduate and Researches Suez Canal University41522IsmailiaEgypt Department of Marine Science Faculty of ScienceSuez Canal University41522IsmailiaEgypt Department of Marine Science Faculty of SciencePort Said University42511Port SaidEgypt Department of Chemistry Faculty of ScienceSuez Canal University41522IsmailiaEgypt Department of Microbiology Faculty of PharmacySuez Canal University41522IsmailiaEgypt

Objective: To investigate the chitin yield of two commercial crustacean species that are exploited in the Suez Canal region, the Red Sea crab Charybdis natator (C. natator) and the Mediterranean mantis shrimp Erugosquilla massavensis (E. massavensis), and to assess the effect of some biological factors such as sex, size and maturity stages of females' ovaries on this yield. Methods: A total of 64 specimens of crabs were collected from the Red Sea and 1377 mantis shrimps were collected from the Mediterranean Sea. Chitin was obtained after the de-proteinization, de-mineralization and de-colorization of 5 g oven dried exoskeletons and values were expressed as g/5 g and percentages. Results: Chitin yield was significantly higher in E. massavensis than C. natator (22.1%, 14.22%, respectively). No significant difference in the yield was recorded between males and females of C. natator (12.9%, 14.9%, respectively), while the yield in E. massavensis males was significantly higher than females (25.3%, 21.2%, respectively). Significant variations in the chitin yield were observed between the different sizes of E. massavensis with the maximum being from the individuals falling in the size range 90–130 mm body length. The yield was at its lowest in the immature stage of C. natator females' ovaries (9.29%). However, the values increased and remained constant for the remaining stages (≥ 18%). Conclusions: The study recommends the use of the mantis shrimp for the production of chitin on commercial scale particularly medium sized males.

关键词： Chitin yield Biological factors Erugosquilla massavensis Charybdis natator

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Therapeutic Effect of Dimethyl Dimethoxy Biphenyl Dicarboxylate on Collagen-Induced Arthritis in Rats

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Chinese Journal of Integrative Medicine 2015年第11期21卷 846-854页

作者： Roba M talaat amira S abo-EI-Atta Sabah M Farou Karima I EI-Dosoky Molecular Biology Department Genetic Engineering and Biotechnology Research InstituteMenofia UniversitySadat Branch Pathology Department Faculty of MedicineTanta University

Objective： To study the effect of oral administration of dimethyl dimethoxy biphenyl dicarboxylate （DDB） on adjusting angiogeneic/inflammatory mediators and ameliorating the pathology of bones in rats with collagen-induced arthritis （CIA）. Methods： Wistar rat model of CIA was set up using bovine collagen type H. Fifty rats were divided into five groups randomly： normal, CIA model, DDB treatment, methotrexate （MTX） treatment, and combined DDB＋MTX treatment. Ankle joints of rats were imaged with digital X-ray machine to show the destruction of joints. Fore and hind paw and knee joints were removed above the ankle joint then processed for haematoxylin and eosin staining. Plasma levels of vascular endothelial growth factor （VEGF）, platelet derived growth factor, interleukin-8 （IL-8）, IL-4, tumor necrosis factor α （TNF-α）, and cyclooxygenase-2 （COX-2） were quantified by enzyme-linked immunosorbent assay. Nitric oxide levels were detected by Griess reagent. Results： Compared with the CIA model group, a remarkable reduction in various angiogenic （VEGF and IL-8） and inflammatory mediators （TNF-α, IL-4 and COX-2） after treatment with DDB either alone or combined with MTX （P〈0.05 or P〈0.01）. Histopathological and X-ray findings were confirmatory to the observed DDB anti-arthritic effect. The DDB-treated group showed amelioration in signs of arthritis which appeared essentially similar to normal. Conclusion： Our data shed light on the therapeutic efficacy of DDB in experimental rheumatoid arthritis （RA） compared with a choice drug （MTX） and it may be offered as a second-line drug in the treatment of RA.

关键词： rheumatoid arthritis collagen-induced arthritis dimethyl dimethoxy biphenyl dicarboxylate angiogenesis inflammation

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