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Vaccines 2014, 2(2), 380-396; doi:10.3390/vaccines2020380
Article

Pleurocidin Peptide Enhances Grouper Anti-Vibrio harveyi Immunity Elicited by Poly(lactide-co-glycolide)-Encapsulated Recombinant Glyceraldehyde-3-phosphate Dehydrogenase

1,†
, 2,†
, 2,†
, 2,†
 and 2,*
Received: 31 March 2014; in revised form: 6 May 2014 / Accepted: 6 May 2014 / Published: 14 May 2014
(This article belongs to the Special Issue Peptide Vaccine)
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Abstract: Outer membrane proteins, such as glyceraldehyde-3-phosphate dehydrogenase (GAPDH), are considered immunodominant antigens for eliciting protective immunity against Vibrio harveyi, the main etiological agent of vibriosis in fish. Cationic antimicrobial peptides (AMPs), such as pleurocidin (PLE), play important roles in activating and recruiting immune cells, thereby contributing to subsequent innate and adaptive immune responses. In the present study, we aimed to use PLE peptide as a potent adjuvant to improve the immunogenicity of V. harveyi recombinant GAPDH (rGAPDH). In order to prepare a controlled-release vaccine, PLE peptide and rGAPDH protein were simultaneously encapsulated into polymeric microparticles made from the biodegradable poly(lactide-co-glycolide) (PLG) polymer. The resulting PLG-encapsulated PLE plus rGAPDH (PLG-PLE/rGAPDH) microparticles, 3.21–6.27 μm in diameter, showed 72%–83% entrapment efficiency and durably released both PLE and rGAPDH for a long 30-day period. Following peritoneal immunization in grouper (Epinephelus coioides), PLG-PLE/rGAPDH microparticles resulted in significantly higher (p < 0.05, nested design) long-lasting GAPDH-specific immunity (serum titers and lymphocyte proliferation) than PLG-encapsulated rGAPDH (PLG-rGAPDH) microparticles. After an experimental challenge of V. harveyi, PLG-PLE/rGAPDH microparticles conferred a high survival rate (85%), which was significantly higher (p < 0.05, chi-square test) than that induced by PLG-rGAPDH microparticles (67%). In conclusion, PLE peptide exhibits an efficacious adjuvant effect to elicit not only improved immunity, but also enhanced protection against V. harveyi in grouper induced by rGAPDH protein encapsulated in PLG microparticles.
Keywords: Vibrio harveyi (V. harveyi); pleurocidin (PLE); glyceraldehyde-3-phosphate dehydrogenase (GAPDH); poly(lactide-co-glycolide) (PLG) Vibrio harveyi (V. harveyi); pleurocidin (PLE); glyceraldehyde-3-phosphate dehydrogenase (GAPDH); poly(lactide-co-glycolide) (PLG)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Chuang, S.-C.; Huang, W.-L.; Kau, S.-W.; Yang, Y.-P.; Yang, C.-D. Pleurocidin Peptide Enhances Grouper Anti-Vibrio harveyi Immunity Elicited by Poly(lactide-co-glycolide)-Encapsulated Recombinant Glyceraldehyde-3-phosphate Dehydrogenase. Vaccines 2014, 2, 380-396.

AMA Style

Chuang S-C, Huang W-L, Kau S-W, Yang Y-P, Yang C-D. Pleurocidin Peptide Enhances Grouper Anti-Vibrio harveyi Immunity Elicited by Poly(lactide-co-glycolide)-Encapsulated Recombinant Glyceraldehyde-3-phosphate Dehydrogenase. Vaccines. 2014; 2(2):380-396.

Chicago/Turabian Style

Chuang, Shu-Chun; Huang, Wan-Ling; Kau, Sau-Wei; Yang, Yun-Pei; Yang, Chung-Da. 2014. "Pleurocidin Peptide Enhances Grouper Anti-Vibrio harveyi Immunity Elicited by Poly(lactide-co-glycolide)-Encapsulated Recombinant Glyceraldehyde-3-phosphate Dehydrogenase." Vaccines 2, no. 2: 380-396.

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