نتایج جستجو برای: heterologous immunity
تعداد نتایج: 99989 فیلتر نتایج به سال:
Naturally occurring hepatitis C virus (HCV) infection has long been thought to induce a weak immunity which is insufficient to protect an individual from subsequent infections and has cast doubt on the ability to develop effective vaccines. A series of intrahepatic genetic inoculations (IHGI) with type 1a HCV RNA were performed in a chimpanzee to determine whether a form of genetic immunization...
Heterologous immunity is an important aspect of the adaptive immune response. We hypothesized that this process could modulate the HIV-1-specific CD8+ T cell response, which has been shown to play an important role in HIV-1 immunity and control. We found that stimulation of peripheral blood mononuclear cells (PBMCs) from HIV-1-positive subjects with microbial peptides that were cross-reactive w...
Bacteriocins related to colicin M, acting via cleavage of the cell wall precursor lipid II, have been characterized in γ- and β-proteobacteria. Depending on the species, immunity is provided by either an inner membrane-anchored periplasmic protein or by an integral membrane protein. In Pseudomonas however, the immunity partner of colicin M-like bacteriocins remains unknown. Based on an in silic...
We characterized prime-boost vaccine regimens using heterologous and homologous vector and gene inserts. Heterologous regimens offer a promising approach that focuses the cell-mediated immune response on the insert and away from vector-dominated responses. Ad35-GRIN/ENV (Ad35-GE) vaccine is comprised of two vectors containing sequences from HIV-1 subtype A gag, rt, int, nef (Ad35-GRIN) and env ...
1. The continuation of our experiments with intradermal Type I pneumococcus infection in rabbits has furnished further evidence of the marked analogies between this condition and that of human lobar pneumonia. 2. It has been found that the amount of antiserum necessary for successful therapy increases as the disease progresses, and that this progression has a definite mathematical character. Su...
The capacity of hamster peritoneal cell populations to control viability and growth of Besnoitia and Toxoplasma organisms was assessed in vivo and in vitro. Immunized hamsters reduced the homologous organisms 100- to 10,000-fold over a 5-day period, but the heterologous infection increased 100- to 1,000-fold in numbers, similar as in the nonimmune controls. Passively administered antibody was i...
The WHO Strategic Advisory Group of Experts (SAGE) on immunization recently published their conclusions from a systematic review of the ‘non-specific’ or ‘heterologous effects’ of vaccines, hailing a new era in our understanding of what vaccines do to the immune system. The report recognizes that bacille Calmette-Guérin (BCG) vaccine and measles vaccine (MV) may provide survival benefits agains...
Nisin U is a member of the extended nisin family of lantibiotics. Here we identify the presence of nisin U immunity gene homologues in Streptococcus infantarius subsp. infantarius BAA-102. Heterologous expression of these genes in Lactococcus lactis subsp. cremoris HP confers protection to nisin U and other members of the nisin family, thereby establishing that the recently identified phenomeno...
Abstract Innate immune cells, such as monocytes, can generate a non-specific ‘memory’ response (a.k.a. trained immunity) upon stimulation with an antigen/bacterium (e.g., LPS or BCG), which confers heterologous protection against another infectious agent. However, the association between nature of stimulants and corresponding correlate immunity is not fully understood. Similarly, macrophages “t...
Worldwide, 16 cases of HIV-1 superinfection in humans have been reported since 2002. Superinfection is defined as the reinfection of an individual who already has an established infection with a heterologous HIV strain. Controversy exists surrounding superinfection, because it has implications concerning our understanding of worldwide HIV diversity, individual immunity and disease progression, ...
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