Hesari, T, Tahoori, F, Nazari, A, Salehi Najafabadi, Z, Samianifard, M, Faramarzi, A, Soleimani, M. (1401). Investigation of the Effect of PEG Detoxification on Diphtheria Vaccine. سامانه مدیریت نشریات علمی, 77(2), 739-745. doi: 10.22092/ari.2021.354020.1621
T Hesari; F Tahoori; A Nazari; Z Salehi Najafabadi; M Samianifard; A Faramarzi; M Soleimani. "Investigation of the Effect of PEG Detoxification on Diphtheria Vaccine". سامانه مدیریت نشریات علمی, 77, 2, 1401, 739-745. doi: 10.22092/ari.2021.354020.1621
Hesari, T, Tahoori, F, Nazari, A, Salehi Najafabadi, Z, Samianifard, M, Faramarzi, A, Soleimani, M. (1401). 'Investigation of the Effect of PEG Detoxification on Diphtheria Vaccine', سامانه مدیریت نشریات علمی, 77(2), pp. 739-745. doi: 10.22092/ari.2021.354020.1621
Hesari, T, Tahoori, F, Nazari, A, Salehi Najafabadi, Z, Samianifard, M, Faramarzi, A, Soleimani, M. Investigation of the Effect of PEG Detoxification on Diphtheria Vaccine. سامانه مدیریت نشریات علمی, 1401; 77(2): 739-745. doi: 10.22092/ari.2021.354020.1621
Investigation of the Effect of PEG Detoxification on Diphtheria Vaccine
1Imam Khomeini International University, Qazvin, Iran
2Department of Human Bacterial vaccine, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
3Department of Proteomics-Biochemistry, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
چکیده
Immunization has been considered a successful global health program that saves many persons’ lives each year. The vaccines reduce the risk of getting the disease by building immunity in the body. Therefore, the constant availability of essential vaccines is an important factor in community health. One of the most important vaccines is the diphtheria vaccine, which is usually used as Multivalent diphtheria-tetanus-pertussis (DTP) combination vaccines. The production of this vaccine takes about 45 days, from the initial bacterial culture to the end of toxin production. However, the production of this vaccine can be optimized in case the production stages are carried out under normal conditions. In this study, a significant amount of impurities was removed after washing with phosphate buffer saline, and the toxin was then purified by Sephadex G-50. In this method, the toxin was concentrated to be stored in a smaller space (this removes the concerns for the provision of a suitable space). Another problem with the diphtheria vaccine is that it is reversible after detoxification of the toxin using formaldehyde. For this reason, it is suggested to use MPEG for detoxification, which will produce more stable covalent bonds between PEG and the first type of amine groups in the toxin chain. Tests were performed to evaluate factors, such as in vivo cytotoxicity, lack of edemas formation, the neutralizing activity of serum from guinea pigs immunized with the diphtheria toxoid inactivated with MPEG, and the immunogenic activity of the purified and modified toxin. Comparison of this PEG detoxification toxoid with the standard toxoid produced in Razi Vaccine and Serum Institution, Karaj, Iran, showed that washing with PBS and purification with Sephadex G-50 was an efficient method. The stability and reversibility of the toxoid approved by MPEG were acceptable. Therefore, the results of animal tests showed that the obtained product was stable and caused no wound or necrosis in the tested animals.
ایمن سازی برنامه موفقی در زمینه سلامت جهانی بوده است که سالانه جان انسانهای زیادی را نجات می دهد. واکسن ها با ایجاد ایمنی در بدن، خطر ابتلا به بیماری را کاهش می دهند. لذا در دسترس بودن همیشگی واکسنهای ضروری، از فاکتورهای مهم سالم بودن جامعه است. یکی از واکسن های ضروری در سرتاسر جهان، واکسن دیفتری است که معمولاً به صورت چندگانه با کزازو سیاه سرفه، تزریق می شود. تولید این واکسن از زمان کشت اولیه تا تولید توکسوئید چیزی حدود 45 روز زمان نیاز دارد. اگر بتوان در شرایط عادی مراحل زیادی از تولید را پیش برد و ماده حدواسط را نگهداری کرد ، کمک بزرگی به تولید این واکسن خواهد بود. در این تحقیق روش تخلیص (با شستشو و کروماتوگرافی) و نگهداری توکسین برای مدت چند ماه ارائه میشود که در این روش با تغلیظ نمونه، می توان آن را در فضای کوچکتری نگهداری کرد و مشکلی از جهت تامین فضای مناسب پیش نخواهد آمد. مشکل دیگر واکسن دیفتری، برگشت پذیر بودن آن پس از سمیت زدایی توکسین با فرمالدهید است. در اینجا برای رفع این مشکل، استفاده از mPEG جهت سمیت زدایی پیشنهاد می شود که با این روش پیوندهای کووالانسی پایدارتری بین PEG و گروههای آمین نوع اول (-NH2) در زنجیره توکسین تولید خواهد شد. لذا محصول پایدارتی خواهیم داشت که نتایج تست حیوانی نشان می دهد این محصول در حیوانات مورد آزمایش هیچگونه زخم و نکروزی ایجاد نکرده اند.
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