RESUMO
Bone morphogenetic protein 2 (BMP2) and basic fibroblast growth factor (bFGF) have been shown to exhibit a synergistic effect to promote bone repair and healing. In this study, we constructed a novel adenovirus with high coexpression of BMP2 and bFGF and evaluated its effect on osteogenic differentiation of goat bone marrow progenitor cells (BMPCs). Recombinant adenovirus Ad-BMP2-bFGF was constructed by using the T2A sequence. BMPCs were isolated from goats by density gradient centrifugation and adherent cell culture, and were then infected with Ad-BMP2-bFGF or Ad-BMP2. Expression of BMP2 and bFGF was detected by ELISA, and alkaline phosphatase (ALP) activity was detected by an ALP assay kit. In addition, von Kossa staining and immunocytochemical staining of collagen II were performed on BMPCs 21 days after infection. There was a high coexpression of BMP2 and bFGF in BMPCs infected with Ad-BMP2-bFGF. Twenty-one days after infection, ALP activity was significantly higher in BMPCs infected with Ad-BMP2-bFGF than in those infected with Ad-BMP2. Larger and more mineralized calcium nodules, as well as stronger collagen II staining, were observed in BMPCs infected with Ad-BMP2-bFGF than in those infected with Ad-BMP2. In summary, we developed a novel adenovirus vector Ad-BMP2-bFGF for simultaneous high coexpression of BMP2 and bFGF, which could induce BMPCs to differentiate efficiently into osteoblasts.
Assuntos
Animais , Adenoviridae/metabolismo , Células da Medula Óssea/citologia , /metabolismo , Diferenciação Celular/fisiologia , /metabolismo , Osteogênese/fisiologia , Células-Tronco/citologia , Análise de Variância , Adenoviridae/genética , Fosfatase Alcalina/metabolismo , Sequência de Bases , Células da Medula Óssea/virologia , /genética , Centrifugação com Gradiente de Concentração , Ensaio de Imunoadsorção Enzimática , /genética , Técnicas de Transferência de Genes , Cabras , Vetores Genéticos/metabolismo , Imuno-Histoquímica , Osteoblastos/citologia , Cultura Primária de Células , Proteínas Recombinantes/genética , Células-Tronco/virologiaRESUMO
Severe chronic active Epstein-Barr virus (EBV) infection is a rare and life-threatening illness. Although the criteria for diagnosis include chronic or recurrent infectious mononucleosis-like symptoms lasting more than 6 months and high titers of anti-EBV antibodies, clinical and laboratory findings may be heterogeneous and flexible application of those criteria is necessary in cases showing typical clinical and pathologic findings. We report a case of severe chronic active EBV infection in a 62-yr-old female patient who showed classical clinical findings with infiltration of EBV-infected T lymphocytes in the bone marrow, spleen, and lymph nodes, and died four months after presentation.