Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Filtrar
Filtros adicionais











Intervalo de ano
1.
Fish Shellfish Immunol ; 93: 743-751, 2019 Aug 10.
Artigo em Inglês | MEDLINE | ID: mdl-31408731

RESUMO

White shrimp Litopenaeus vannamei are widely cultured in the world and white spot syndrome virus (WSSV) led to huge economic losses in the shrimp industry every year. In the present study, miRNAs involved in the response of shrimp L. vannamei to WSSV infection were obtained through the Illumina HiSeq 2500 high-throughput next-generation sequencing technique. A total number of 7 known miRNAs and 54 putative novel miRNAs were obtained. Among them, 14 DEMs were identified in the shrimp infected with WSSV. The putative target genes of these DEMs were related to host immune response or signaling pathways, indicating the importance of miRNAs in shrimp against WSSV infection. The results will provide information for further research on shrimp response to virus infection and contribute to the development of new strategies for effective protection against WSSV infections.

2.
Sci Rep ; 8(1): 822, 2018 01 16.
Artigo em Inglês | MEDLINE | ID: mdl-29339745

RESUMO

The Asian honeybee Apis cerana is one of two bee species that have been commercially kept with immense economic value. Here we present the analysis of genomic sequence and transcriptomic exploration for A. cerana as well as the comparative genomic analysis of the Asian honeybee and the European honeybee A. mellifera. The genome and RNA-seq data yield new insights into the behavioral and physiological resistance to the parasitic mite Varroa the evolution of antimicrobial peptides, and the genetic basis for labor division in A. cerana. Comparison of genes between the two sister species revealed genes specific to A. cerana, 54.5% of which have no homology to any known proteins. The observation that A. cerana displayed significantly more vigilant grooming behaviors to the presence of Varroa than A. mellifera in conjunction with gene expression analysis suggests that parasite-defensive grooming in A. cerana is likely triggered not only by exogenous stimuli through visual and olfactory detection of the parasite, but also by genetically endogenous processes that periodically activates a bout of grooming to remove the ectoparasite. This information provides a valuable platform to facilitate the traits unique to A. cerana as well as those shared with other social bees for health improvement.


Assuntos
Abelhas/genética , Abelhas/fisiologia , Perfilação da Expressão Gênica , Genômica , Animais , Comportamento Animal , Fenótipo , Análise de Sequência de DNA , Análise de Sequência de RNA
3.
Fish Shellfish Immunol ; 42(1): 138-43, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25449379

RESUMO

Iron is considered as an essential element for all living organisms. Therefore, limiting iron availability may be key part of the host's innate immune response to various pathogens. Ferritin is a major iron storage protein in living cells and plays an important role in iron homeostasis. One way the host can transiently reduce iron bioavailability is by ferritin over expression. In invertebrates, ferritin was found to be up-regulated after pathogens challenge and is considered to be an important element in the innate immune system. This study was designed to investigate the involvement of ferritin in shrimp Litopenaeus vannamei defense against WSSV. We discovered that the viral load of shrimp injected with recombinant ferritin protein was lower than that of control group. The suppression of ferritin by dsRNA increased susceptibility to WSSV with 3-fold high viral copies. The present study documented that ferritin protected shrimp L. vannamei from WSSV by inhibiting virus replication. We presume that ferritin reduce iron availability, leading to inhibit the activity of ribonucleotide reductase and delay the replication of virus genome. This study provided new insights into the understanding of molecular responses and defense mechanisms in shrimp against WSSV.


Assuntos
Ferritinas/farmacologia , Penaeidae/virologia , Proteínas Recombinantes/farmacologia , Replicação Viral/efeitos dos fármacos , Vírus da Síndrome da Mancha Branca 1/efeitos dos fármacos , Animais , Primers do DNA/genética , DNA Complementar/genética , Eletroforese em Gel de Poliacrilamida , Escherichia coli , Penaeidae/efeitos dos fármacos , Reação em Cadeia da Polimerase em Tempo Real , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Carga Viral/efeitos dos fármacos
4.
J Zhejiang Univ Sci B ; 15(12): 1032-8, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25471832

RESUMO

The p53 tumor suppressor protein coordinates the cellular responses to a broad range of cellular stresses, leading to DNA repair, cell cycle arrest or apoptosis. The stability of p53 is essential for its tumor suppressor function, which is tightly controlled by ubiquitin-dependent degradation primarily through its negative regulator murine double minute 2 (Mdm2). To better understand the regulation of p53, we tested the interaction between p53 and USP11 using co-immunoprecipitation. The results show that USP11, an ubiquitin-specific protease, forms specific complexes with p53 and stabilizes p53 by deubiquitinating it. Moreover, down-regulation of USP11 dramatically attenuated p53 induction in response to DNA damage stress. These findings reveal that USP11 is a novel regulator of p53, which is required for p53 activation in response to DNA damage.


Assuntos
Dano ao DNA , Tioléster Hidrolases/metabolismo , Proteína Supressora de Tumor p53/metabolismo , Ubiquitina/metabolismo , Apoptose , Ciclo Celular , Linhagem Celular Tumoral , Cicloeximida/química , Reparo do DNA , Células HEK293 , Humanos , Plasmídeos/metabolismo , Proteínas Proto-Oncogênicas c-mdm2/metabolismo , Interferência de RNA , Ubiquitinação
5.
PLoS One ; 8(9): e74460, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-24073212

RESUMO

The translationally controlled tumor protein (TCTP) is an abundant, ubiquitous, and conserved protein which plays important roles in a number of biological processes. In the present study, the TCTP in shrimp Litopenaeus vannamei was analyzed. The TCTP of L.vannamei, a 168-amino-acid polypeptide, shares a high degree of similarity with TCTPs from other species, having two TCTP protein signatures at the 45-55 aa and 123-145 aa motif. The mRNA and protein levels from different tissues were detected with the highest in muscle and the lowest in heart among all examined tissues. In addition, temporal TCTP expression was significantly up-regulated at 16 h and 48 h following infection with white spot syndrome virus (WSSV). Lastly, silencing of TCTP with dsRNA led to a significant increase of WSSV loads. These results provide new insights into the importance of TCTP as an evolutionarily conserved molecule for shrimp innate immunity against virus infection.


Assuntos
Biomarcadores Tumorais/metabolismo , Imunidade Inata/imunologia , Penaeidae/imunologia , Penaeidae/virologia , Vírus da Síndrome da Mancha Branca 1/patogenicidade , Sequência de Aminoácidos , Animais , Sequência de Bases , Biomarcadores Tumorais/genética , Biomarcadores Tumorais/imunologia , Western Blotting , Regulação da Expressão Gênica , Dados de Sequência Molecular , Penaeidae/genética , Filogenia , RNA de Cadeia Dupla/genética , RNA Mensageiro/genética , Reação em Cadeia da Polimerase em Tempo Real , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Homologia de Sequência de Aminoácidos
6.
Onco Targets Ther ; 5: 279-86, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-23093908

RESUMO

BACKGROUND: Growing evidence supports BH3-interacting domain death agonist (Bid) playing a dual role in DNA damage response. However, the effects of Bid on hepatocellular carcinoma (HCC) cell proliferation in response to etoposide-induced DNA damage have not been sufficiently investigated. METHODS: Using a stable Bid-overexpression HCC cell line, Bid/PLC/PRF/5, overexpression of Bid promoted loss of viability in response to etoposide-induced DNA damage. MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide]- and BrdU (5'-bromo-2'-deoxyuridine)-labeling assays revealed that etoposide-inhibited HCC cells grew in concentration-and time-dependent manners. The phosphorylations of Akt and mitogen-activated protein kinases (MAPKs) in response to etoposide-induced DNA damage were analyzed by Western blotting. RESULTS: The survival rates of 100 µM etoposide on the cells with control vector and Bid/PLC/PRF/5 at 48 hours amounted to 71% ± 0.75% and 59% ± 0.60% with MTT assay, and similar results of 85% ± 0.08% and 63% ± 0.14% with BrdU-labeling assay respectively. Moreover, overexpression of Bid sensitized the cells to apoptosis at a high dose of etoposide (causing irreparable damage). However, it had little effect on the proliferation at a low dose of etoposide (repairable damage). Furthermore, the phosphorylation status of Akt and MAPKs were investigated. Overexpression of Bid suppressed the activation of Akt with respect to etoposide-induced DNA damage. Similar to Akt, the levels of phosphorylated p38 and phosphorylated c-Jun were attenuated by Bid-overexpression. On the contrary, the level of phosphorylated ERK1/2 was sustained at a high level, especially in Bid/PLC/PRF/5 cells. CONCLUSION: Taken together, these results suggest that overexpression of Bid suppressed the activation of Akt, p38, and c-Jun, and promoted the activation of ERK1/2 induced by etoposide, suggesting that the promotion of ERK1/2 activation may have a negative effect on Bid-mediated HCC DNA damage induced by etoposide.

SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA