Published January 1, 2021
| Version v1
Journal article
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Gamma-irradiated SARS-CoV-2 vaccine candidate, OZG-38.61.3, confers protection from SARS-CoV-2 challenge in human ACEII-transgenic mice
Creators
- Turan, Raife Dilek
- Tastan, Cihan
- Kancagi, Derya Dilek1
- Yurtsever, Bulut1
- Karakus, Gozde Sir1
- Ozer, Samed2
- Abanuz, Selen
- Cakirsoy, Didem
- Tumentemur, Gamze3
- Demir, Sevda4
- Seyis, Utku1
- Kuzay, Recai1
- Elek, Muhammer
- Kocaoglu, Miyase Ezgi1
- Ertop, Gurcan3
- Arbak, Serap5
- Elmas, Merve Acikel5
- Hemsinlioglu, Cansu1
- Ng, Ozden Hatirnaz6
- Akyoney, Sezer
- Akyoney, Sezer
- 1. Acibadem Labcell Cellular Therapy Lab, Istanbul, Turkey
- 2. Acibadem Mehmet Ali Aydinlar Univ, Anim Applicat & Res Ctr, Istanbul, Turkey
- 3. Acibadem Mehmet Ali Aydinlar Univ, Vocat Sch Hlth Serv, Istanbul, Turkey
- 4. Yeditepe Univ, Genet & Bioengn Dept, Istanbul, Turkey
- 5. Acibadem Mehmet Ali Aydinlar Univ, Histol & Embryol Dept, Istanbul, Turkey
- 6. Acibadem Mehmet Ali Aydinlar Univ, Med Biol Dept, Istanbul, Turkey
Description
The SARS-CoV-2 virus caused the most severe pandemic around the world, and vaccine development for urgent use became a crucial issue. Inactivated virus formulated vaccines such as Hepatitis A and smallpox proved to be reliable approaches for immunization for prolonged periods. In this study, a gamma-irradiated inactivated virus vaccine does not require an extra purification process, unlike the chemically inactivated vaccines. Hence, the novelty of our vaccine candidate (OZG-38.61.3) is that it is a non-adjuvant added, gamma-irradiated, and intradermally applied inactive viral vaccine. Efficiency and safety dose (either 10(13) or 10(14) viral RNA copy per dose) of OZG-38.61.3 was initially determined in BALB/c mice. This was followed by testing the immunogenicity and protective efficacy of the vaccine. Human ACE2-encoding transgenic mice were immunized and then infected with the SARS-CoV-2 virus for the challenge test. This study shows that vaccinated mice have lowered SARS-CoV-2 viral RNA copy numbers both in oropharyngeal specimens and in the histological analysis of the lung tissues along with humoral and cellular immune responses, including the neutralizing antibodies similar to those shown in BALB/c mice without substantial toxicity. Subsequently, plans are being made for the commencement of Phase 1 clinical trial of the OZG-38.61.3 vaccine for the COVID-19 pandemic.
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