Novel recombinant DNA vaccine candidates for human respiratory syncytial virus: Preclinical evaluation of immunogenicity and protection efficiency
The development of safe and potent vaccines for human respiratory syncytial virus (HRSV) is still a challenge for researchers worldwide. DNA-based immunization is currently a promising approach that has been used to generate human vaccines for different age groups. In this study, novel HRSV DNA vacc...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2017-07-01
|
| Series: | Human Vaccines & Immunotherapeutics |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/21645515.2017.1295190 |
| _version_ | 1797677611875303424 |
|---|---|
| author | Mohamed A. Farrag Haitham M. Amer Peter Öhlschläger Maaweya E. Hamad Fahad N. Almajhdi |
| author_facet | Mohamed A. Farrag Haitham M. Amer Peter Öhlschläger Maaweya E. Hamad Fahad N. Almajhdi |
| author_sort | Mohamed A. Farrag |
| collection | DOAJ |
| description | The development of safe and potent vaccines for human respiratory syncytial virus (HRSV) is still a challenge for researchers worldwide. DNA-based immunization is currently a promising approach that has been used to generate human vaccines for different age groups. In this study, novel HRSV DNA vaccine candidates were generated and preclinically tested in BALB/c mice. Three different versions of the codon-optimized HRSV fusion (F) gene were individually cloned into the pPOE vector. The new recombinant vectors either express full-length (pPOE-F), secretory (pPOE-TF), or M282–90 linked (pPOE-FM2) forms of the F protein. Distinctive expression of the F protein was identified in HEp-2 cells transfected with the different recombinant vectors using ELISA and immunofluorescence. Mice immunization verified the potential for recombinant vectors to elicit significant levels of neutralizing antibodies and CD8+ T-cell lymphocytes. pPOE-TF showed higher levels of gene expression in cell culture and better induction of the humoral and cellular immune responses. Following virus challenge, mice that had been immunized with the recombinant vectors were able to control virus replication and displayed lower inflammation compared with mice immunized with empty pPOE vector or formalin-inactivated HRSV vaccine. Moreover, pulmonary cytokine profiles of mice immunized with the 3 recombinant vectors were similar to those of the mock infected group. In conclusion, recombinant pPOE vectors are promising HRSV vaccine candidates in terms of their safety, immunogenicity and protective efficiency. These data encourage further evaluation in phase I clinical trials. |
| first_indexed | 2024-03-11T22:47:47Z |
| format | Article |
| id | doaj.art-563b21ed89d0473a817dbcc228a63d53 |
| institution | Directory Open Access Journal |
| issn | 2164-5515 2164-554X |
| language | English |
| last_indexed | 2024-03-11T22:47:47Z |
| publishDate | 2017-07-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Human Vaccines & Immunotherapeutics |
| spelling | doaj.art-563b21ed89d0473a817dbcc228a63d532023-09-22T08:17:49ZengTaylor & Francis GroupHuman Vaccines & Immunotherapeutics2164-55152164-554X2017-07-011371586159710.1080/21645515.2017.12951901295190Novel recombinant DNA vaccine candidates for human respiratory syncytial virus: Preclinical evaluation of immunogenicity and protection efficiencyMohamed A. Farrag0Haitham M. Amer1Peter Öhlschläger2Maaweya E. Hamad3Fahad N. Almajhdi4College of Science, King Saud UniversityCollege of Science, King Saud UniversityAachen University of Applied SciencesCollege of Science, King Saud UniversityCollege of Science, King Saud UniversityThe development of safe and potent vaccines for human respiratory syncytial virus (HRSV) is still a challenge for researchers worldwide. DNA-based immunization is currently a promising approach that has been used to generate human vaccines for different age groups. In this study, novel HRSV DNA vaccine candidates were generated and preclinically tested in BALB/c mice. Three different versions of the codon-optimized HRSV fusion (F) gene were individually cloned into the pPOE vector. The new recombinant vectors either express full-length (pPOE-F), secretory (pPOE-TF), or M282–90 linked (pPOE-FM2) forms of the F protein. Distinctive expression of the F protein was identified in HEp-2 cells transfected with the different recombinant vectors using ELISA and immunofluorescence. Mice immunization verified the potential for recombinant vectors to elicit significant levels of neutralizing antibodies and CD8+ T-cell lymphocytes. pPOE-TF showed higher levels of gene expression in cell culture and better induction of the humoral and cellular immune responses. Following virus challenge, mice that had been immunized with the recombinant vectors were able to control virus replication and displayed lower inflammation compared with mice immunized with empty pPOE vector or formalin-inactivated HRSV vaccine. Moreover, pulmonary cytokine profiles of mice immunized with the 3 recombinant vectors were similar to those of the mock infected group. In conclusion, recombinant pPOE vectors are promising HRSV vaccine candidates in terms of their safety, immunogenicity and protective efficiency. These data encourage further evaluation in phase I clinical trials.http://dx.doi.org/10.1080/21645515.2017.1295190dna vaccinedisease enhancementfusion proteinhuman respiratory syncytial virusppoe vectortruncated form |
| spellingShingle | Mohamed A. Farrag Haitham M. Amer Peter Öhlschläger Maaweya E. Hamad Fahad N. Almajhdi Novel recombinant DNA vaccine candidates for human respiratory syncytial virus: Preclinical evaluation of immunogenicity and protection efficiency Human Vaccines & Immunotherapeutics dna vaccine disease enhancement fusion protein human respiratory syncytial virus ppoe vector truncated form |
| title | Novel recombinant DNA vaccine candidates for human respiratory syncytial virus: Preclinical evaluation of immunogenicity and protection efficiency |
| title_full | Novel recombinant DNA vaccine candidates for human respiratory syncytial virus: Preclinical evaluation of immunogenicity and protection efficiency |
| title_fullStr | Novel recombinant DNA vaccine candidates for human respiratory syncytial virus: Preclinical evaluation of immunogenicity and protection efficiency |
| title_full_unstemmed | Novel recombinant DNA vaccine candidates for human respiratory syncytial virus: Preclinical evaluation of immunogenicity and protection efficiency |
| title_short | Novel recombinant DNA vaccine candidates for human respiratory syncytial virus: Preclinical evaluation of immunogenicity and protection efficiency |
| title_sort | novel recombinant dna vaccine candidates for human respiratory syncytial virus preclinical evaluation of immunogenicity and protection efficiency |
| topic | dna vaccine disease enhancement fusion protein human respiratory syncytial virus ppoe vector truncated form |
| url | http://dx.doi.org/10.1080/21645515.2017.1295190 |
| work_keys_str_mv | AT mohamedafarrag novelrecombinantdnavaccinecandidatesforhumanrespiratorysyncytialviruspreclinicalevaluationofimmunogenicityandprotectionefficiency AT haithammamer novelrecombinantdnavaccinecandidatesforhumanrespiratorysyncytialviruspreclinicalevaluationofimmunogenicityandprotectionefficiency AT peterohlschlager novelrecombinantdnavaccinecandidatesforhumanrespiratorysyncytialviruspreclinicalevaluationofimmunogenicityandprotectionefficiency AT maaweyaehamad novelrecombinantdnavaccinecandidatesforhumanrespiratorysyncytialviruspreclinicalevaluationofimmunogenicityandprotectionefficiency AT fahadnalmajhdi novelrecombinantdnavaccinecandidatesforhumanrespiratorysyncytialviruspreclinicalevaluationofimmunogenicityandprotectionefficiency |