阅读次数：1155 发布时间：2021/5/11 10:37:43
恒远生物 专业致力于打造国际一流的民族品牌，提供全面的、创新的、优质的、便捷的科研产品和服务。目前，我们自主研发的重组蛋白、抗体、ELISA检测试剂盒得到广大科研用户的认可，并且多次发表于国际权威期刊，进一步推动了民族品牌国际化的传播。After conjugation, PLGA and Chitosan nanoparticles were precipitated and the free amounts of rHCA59 protein were determined by a BCA protein assay kit. It was found that 89% and 71% of rHCA59 were conjugated to PLGA and Chitosan, respectively. In other words, a total of 1.78 mg of protein bound to PLGA, and 1.42 mg of protein bound to Chitosan.A scanning electron microscopy was used to identify the size and morphology of PLGA and Chitosan nanoparticles. The SEM results showed that both PLGA and Chitosan nanoparticles’ appearances were smooth. The size of rHCA59-PLGA NPs was from 180 nm to 402 nm (Figure 1A) and the size of rHCA59-CS NPs was from 200 nm to 500 nm (Figure 1B).
Notes: (1): PBS group (blank control). (2): pET-32a protein group. (3): PBS-PLGA group. (4): PBS-CS group. (5): PBS-CFA group. (6): rHCA59 group. (7): rHCA59-PLGA group. (8): rHCA59-CS group. (9): rHCA59-CFA group. (10): rHCA59-CS-PLGA group. (A) IL-12. (B) IL-17. (C) IFN-γ. (D) IL-4. (E) TGF-β. Data are representative of triplicate independent experiments (*p < 0.05, **p < 0.01, and ***p < 0.001). Abbreviations: PLGA, poly-D,L-lactide-co-glycolide; CS, Chitosan; CFA, complete Freund’s adjuvant; IL, interleukin; ELISA, enzyme linked immunosorbent assay
Notes: rHCA59 loaded nanoparticles could affect the proportions of CD4+ T cells and CD8+ T cells in immunized mice. The percentages of CD4+ T cells (A1–A10) and CD8+ T cells (B1–B10) in ten groups were investigated by flow cytometry on day 14 after immunization. (C and D) Different treatments affected the proportions of CD4+ T cells and CD8+ T cells. (A1 and B1) PBS group (blank control). (A2 and B2) PBS-CFA group. (A3 and B3) PBS-PLGA group. (A4 and B4) PBS-CS group. (A5 and B5) pET-32a protein group. (A6 and B6) rHCA59 group. (A7 and B7) rHCA59-CFA group. (A8 and B8) rHCA59-CS group. (A9 and B9) rHCA59-PLGA group. (A10 and B10) rHCA59-CS-PLGA group. The results shown here are from three independent experiments (*p < 0.05, **p < 0.01, and ***p < 0.001). Abbreviations: CD4, cluster of differentiation 4; CD8, cluster of differentiation 8; T cells, thymus cells; PLGA, poly-D,L-lactide-co-glycolide; CS, Chitosan; CFA, complete Freund’s adjuvant.
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