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Harmful Algae ; 67: 119-130, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-28755714


The genus Pseudo-nitzschia has attracted attention because of production of the toxin, domoic acid (DA), causing Amnesic Shellfish Poisoning (ASP). Pseudo-nitzschia blooms occur frequently in Chinese coastal waters, and DA has been detected in several marine organisms, but so far no Pseudo-nitzschia strains from Chinese waters have been shown to produce DA. In this study, monoclonal Pseudo-nitzschia strains were established from Chinese coastal waters and examined using light microscopy, electron microscopy and molecular markers. Five strains, sharing distinct morphological and molecular features differentiating them from other Pseudo-nitzschia species, represent a new species, Pseudo-nitzschia simulans sp. nov. Morphologically, the taxon belongs to the P. pseudodelicatissima group, cells possessing a central nodule and each stria comprising one row of poroids. The new species is characterized by the poroid structure, which typically comprises two sectors, each sector located near opposite margins of the poroid. The production of DA was examined by liquid chromatography tandem mass spectrometry (LC-MS/MS) analyses of cells in stationary growth phase. Domoic acid was detected in one of the five strains, with concentrations around 1.05-1.54 fg cell-1. This is the first toxigenic diatom species reported from Chinese waters.

Diatomáceas/metabolismo , Ácido Caínico/análogos & derivados , Água do Mar , China , DNA Espaçador Ribossômico/química , DNA Espaçador Ribossômico/genética , Geografia , Ácido Caínico/metabolismo , Ácido Caínico/toxicidade , Conformação de Ácido Nucleico , Filogenia , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Subunidades Ribossômicas Maiores/metabolismo
Artigo em Inglês | MEDLINE | ID: mdl-23097675


Here we used a mouse model of zymosan-induced colorectal hypersensitivity, a similar model of IBS in our previous work, to evaluate the effectiveness of the different number of times of acupuncture and elucidate its potential mechanism of EA treatment. Colorectal distension (CRD) tests show that intracolonic zymosan injection does, while saline injection does not, induce a typical colorectal hypersensitivity. EA treatment at classical acupoints Zusanli (ST36) and Shangjuxu (ST37) in both hind limbs for 15 min slightly attenuated and significantly blunted the hypersensitive responses after first and fifth acupunctures, respectively, to colorectal distention in zymosan treatment mice, but not in saline treatment mice. Western blot results indicated that ion channel and TrpV1 expression in colorectum as well as ERK1/2 MAPK pathway activation in peripheral and central nerve system might be involved in this process. Hence, we conclude that EA is a potential therapeutic tool in the treatment and alleviation of chronic abdominal pain, and the effectiveness of acupuncture analgesia is accumulative with increased number of times of acupuncture when compared to that of a single time of acupuncture.

Rejuvenation Res ; 8(4): 248-53, 2005.
Artigo em Inglês | MEDLINE | ID: mdl-16313224


NANOG is essential for mouse and human embryonic stem cell (ESC) pluripotency and selfrenewal. It is also expressed in several adult murine tissues as shown by reverse transcriptase-polymerase chain reaction (RT-PCR) analysis. However, human NANOG transcripts have been isolated from adult bone marrow (EST; GenBank accession no. BF893620). Here, we study the NANOG gene expression profile in isolated mouse renal papillary cells by Northern blot and RT-PCR. The whole RNA of mouse renal cells was obtained from fresh renal tissues, renal tissues infused by phosphate-buffered saline (PBS), and isolated renal papillary cells of mouse, respectively, as well as the renal papillary tissue from 18.5 days postcoitum (d.p.c.; fetal), 1-2-week-old (young), 1-8-month-old (adult), and 24-month-old (aging) mice. Our analysis shows that a very low expression level was detected in mouse renal tissues, and the renal papillary cells express more than other tissues as determined with Northern blot and RT-PCR. These data suggest that the kidney has its own cells expressing NANOG, and loss of NANOG expression occurs in an age-dependent manner in the kidney, either due to developmental factors or aging, particularly in renal papillary tissue.

Envelhecimento/fisiologia , Proteínas de Ligação a DNA/genética , Proteínas de Homeodomínio/genética , Rim/fisiologia , Animais , Sequência de Bases , Expressão Gênica , Camundongos , Camundongos Endogâmicos BALB C , Dados de Sequência Molecular , Proteína Homeobox Nanog
Chin Med J (Engl) ; 118(8): 627-32, 2005 Apr 20.
Artigo em Inglês | MEDLINE | ID: mdl-15899116


BACKGROUND: Human urate anion exchanger (hURAT1) as a major urate transporter expressed on renal tubular epithelial cells regulates blood urate level by reabsorbing uric acid. Antibody is an important tool to study hURAT1. This study aimed, by genetic immunization, to produce mouse anti-hURAT1 polyclonal antibody with high throughput and high specificity and to detect the location of hURAT1 in human kidney. METHODS: Human renal total RNA was isolated and the entire cDNA of hURAT1 was amplified by RT-PCR. The sequence of intracellular high antigenicity fragment (A280 to R349) was chosen by prediction software of protein antigenicity, and its cDNA was amplified from cDNA of hURAT1, and then cloned into pBQAP-TT vector to construct recombinant plasmid pBQAP-TT-hURAT1-210 for genetic immunization. Mice were inoculated with this recombinant plasmid and two other adjuvant plasmids, pCMVi-GMCSF and pCMVi-Flt3L, which helped to enhance the antibody's generation. After four weeks, the mice were sacrificed to obtain the anti-hURAT1 antibody from serum. The antibody was identified by western blot analysis and immunohistochemistry. At the same time, rabbit anti-hURAT1 antibody was produced by protein immunization. The specificity and efficiency between the rabbit and mouse anti-hURAT1 antibody were compared by western blot analysis and immunohistochemistry. RESULTS: The entire cDNA of hURAT1 and cDNA of its intracellular high immunogenic fragment were amplified successfully. Recombinant plasmid pBQAP-TT-hURAT1-210 for genetic immunization was confirmed by restriction digestion and sequencing. Both the mouse anti-hURAT1 antibody and rabbit anti-hURAT1 antibody recognized 58 kD hURAT1 and 64 kD glycosylated hURAT1 protein bands in western blot. Immunohistochemically, hURAT1 was located at the brush border membrane of renal proximal tubular cells. In addition, the throughput and specificity of the mouse anti-hURAT1 antibody were higher than those of the rabbit anti-hURAT1 antibody. CONCLUSION: Genetic immunization can generate anti-hURAT1 polyclonal antibody of high throughput and specificity.

Anticorpos/análise , Proteínas de Transporte/imunologia , Transportadores de Ânions Orgânicos/imunologia , Animais , Western Blotting , Proteínas de Transporte/análise , Feminino , Humanos , Imunização , Imuno-Histoquímica , Rim/química , Masculino , Camundongos , Transportadores de Ânions Orgânicos/análise , Proteínas de Transporte de Cátions Orgânicos , Plasmídeos , Coelhos