جستجوی مقالات مرتبط با کلیدواژه "ادجوانت" در نشریات گروه "زیست شناسی"

One of the challenges of today's world and also global health priorities is pandemicity of AIDS. Studies have shown that the scope and breadth of the immune responses induction are very effective to protect against HIV. Moreover, simultaneous induction of humoral and cellular immunity responses increases the effectiveness of candidate HIV vaccines. Hence, new approaches such as polyepitopic vaccine strategy and addition of different adjuvants in HIV vaccines’ formulations have been recently considered. In the present study, eukaryotic expression vector (pcDNA3.1-tat/pol/gag/env) was transformed and amplified in the prokaryotic host cells E. coli (DH5α). After vector extraction, it was concentrated and formulated alone and in combination with Alum adjuvant and used as DNA candidate vaccines. DNA candidate vaccines were, then, subcutaneously injected to the BALB/c mice on 0, 14, and 28 days and elicited humoral and cellular immunity responses were finally evaluated. The results showed that the candidate DNA vaccine could not efficiently induce immunity responses (both humoral and cellular responses) by subcutaneous route injection. This observation can be due to a defect in each of the steps of vector harvesting by the target cell to express the surface presentation of the epitopes on the one hand, or the inefficiency of the subcutaneous injection method on the other. Therefore, other vaccines’ injection and deliveries routes along with addition of other adjuvants in vaccine’s formulations could induce immunity responses efficiently and increase vaccine efficacy.

Aim and Archaeal lipid derived liposomes referred to as Archaeosomes are among newly studied adjuvants with some specific immunopotent properties. In the present study large scale cultivation of Methanobrevibacter smithii, lipid extraction of obtained biomass and archaeosome production was assessed and evaluated. archaea Methanobrevibacter smithii, DSMZ 2375 was grown in the fermenter under controlled pH, temperature and anaerobic atmosphere condition to achieve archaeal cell mass. Total polar lipids were extracted via methanol/chloroform/water (2:1:0.8 v/v) solution from the frozen and thawed archaeal cells obtained from large scale cultivation. Archaeal liposomes prepared through hydration of extracted polar lipids by PBS buffer containing bovine serum albumin as the tentative antigen. Hydration was also carried out by BSA free PBS buffer to prepare antigen free archaeosomes to be compared with antigen containing type. Purity of extracted lipids evaluated via agarose gel electrophoresis and SDS-PAGE. Antigen concentration and entrapment analyzed by Lowry method and SDS-PAGE, respectively. Analysis of extracted lipids and archaeosomes revealed the high concentration and purity of obtained total polar lipids and successful entrapment of antigen in the archaeosomes. Adjuvant application of archaeosomes obtained from total polar lipids of Methanobrevibacter smithii could be a promising achievement in a variety of vaccine studies.

Nowadays, the immune cytokines, such as the chicken IL-2 (chIL-2) gene are incorporated into vaccination regimens used by the poultry industry. The cytokines can potentially enhance the efficiency of vaccines according to increase T lymphocyte proliferation, B lymphocyte development and natural killer cell (NK) activation. The aim of this study was extraction and cloning of Iranian chicken interleukine-2 (chIL-2). First of all, in order to extract chIL-2 gene, total cell RNAs were isolated by culturing the harvested splenocytes and using Trizol reagent. The chIL-2 specific mRNA was converted into cDNA using reverse Transcriptase (RT) and specific designed primers. Then, The PCR product was ligated into the PTZ57R/T plasmid (TA-cloning kit) and was transformed into the competent Top10 E. coli using heat shock method. A unique band of 668-bp was obtained after RT-PCR amplification. The results of restriction enzyme, colony PCR from transformed colonies and also gene sequencing confirmed the existence of desired gene in transformants bacteria. For the first time in Iran we could extract and clone the chIL-2 gene in bacteria and gene alignment. A direct sequencing test showed 99% similarity between this gene and the established data in NCBI