Apart from pathologic RF in rheumatoid arthritis (12), organic RF appears in many non-rheumatoid claims (13). Natural monomeric anti-gp120 IgG1 antibodies (3,4) not only possess low avidity insufficient for effective neutralization of HIV but may also contribute to FcR-mediated illness enhancement (7,8). Will it mean that HIV could use high-affinity IgG antibodies for its personal purposes? Luckily, in nature there exist some helpful network-like regulatory mechanisms with a key part of RF antibodies (9). Rheumatoid element (RF) is an autoantibody which specifically binds Fc region of IgG (10,11). Apart from pathologic RF in rheumatoid arthritis (12), natural RF appears in many non-rheumatoid claims (13). Possible beneficial physiological functions of RF include enhanced clearance of immune complexes (ICs) (14), amplification MW-150 of IgG response to pathogens (15), and enhancement of computer virus neutralization (16,17). RF can be inducedin vivoin a highly specific way either by secondary immunization with protein antigens or in response to immunization with the newly created ICs (10,11). New antigenic determinants, which appear in the Fc region of IgG antibody upon antibody-antigen complex formation, may strengthen the specificity of RF (9). The level of RF was significantly higher in some of HIV-infected individuals compared to control organizations (1822). RFs were mainly IgA, IgM immunoglobulins with specificity against anti-HIV IgG (20). RF-mediated enhancement of anti-HIV IgG neutralization activity was found in the sera from MCTD individuals (17). Authors suggested that RF is definitely promising for passive immunotherapy based on NAbs (17). Can RF play a key role in specific enhancement of IgG-mediated neutralization of HIVin vivo? Measurements of RF level both in long-term non-progressors (23) and dual-infected individuals (24) might give some hints. Repeated immunization of uninfected macaques with HIV-1 gp120 glycoprotein may allow researchers not only to track the kinetics of RF induction but also to elucidate whether neutralization-enhancing RF antibodies can guard macaques against subsequent challenge with SHIV. Repeated immunization of SHIV-infected macaques with HIV-1 gp120 glycoprotein might display whether neutralization-enhancing RF antibodies can prolong the asymptomatic period and delay the onset of AIDS. The level of RF is not stable and has a tendency to decline during the acute phase of HIV illness (22). Continuous repeated immunizations with gp120 (e.g., immunizations every 3 weeks; the actual time between immunizations will become adjusted relating to measurements of RF level in individuals) would be the perfect solution is to keep the level of neutralization-enhancing RF antibodies constantly high. Single-administration vaccine (SAV) technology, which is based on pulsatile launch of gp120 from biodegradable polymeric microspheres, mimics repeated immunization scheme, and allows vaccination to be done in one shot (25,26). Patient-specific restorative HIV vaccines (1) actually in simplified version, using the only one gp120 variant created after completion of HIV populace homogenization process (27), can be performed via repeated immunizations from biodegradable polymeric microspheres under SAV (25,26) technology platform. Prophylactic HIV vaccines can Rabbit Polyclonal to EPHB6 be based on the variations of sequential plan (28) for long term pulsatile launch of gp120 glycoproteins from biodegradable polymeric microspheres in single-shot (25,26) way easy for both individuals and doctors. Studies (15,17) have shown the high potential MW-150 of neutralization-enhancing RF antibodies, but several principal questions arise: Can neutralization-enhancing RF antibodies (NeRFa) become induced after repeated immunization of humans with recombinant gp120 glycoprotein? Will the power of gp120 MW-150 immunogen design (2931) combined with an ideal vaccination routine help the induction of NeRFa? Could NeRFa help to improve the effectiveness of earlier (32) and future HIV vaccines based on induction of NAbs? Might induction of NeRFa be a future promising method not only against malaria as suggested in Ref. (33), but also against life-threatening viruses like Ebola (34)? Repeated immunization with gp120 glycoprotein might lead to long term induction of neutralization-enhancing RF antibodies having a MW-150 potential to be explored for finding the ways to lengthen lives of HIV-infected individuals and to quit current HIV pandemic. ==.