نتایج جستجو برای: fh protein
تعداد نتایج: 1237776 فیلتر نتایج به سال:
Neisseria gonorrhoeae can engage human complement receptor 3 (CR3) directly or through surface-bound iC3b. Factor H (fH) that binds to bacteria facilitates conversion of C3b to iC3b. fH also binds directly to CR3 on professional phagocytes. Certain nonprofessional phagocytes, such as primary cervical epithelial cells, also express CR3. We hypothesized that fH could bridge bacteria to CR3 and fa...
Neisseria meningitis remains a leading cause of sepsis and meningitis, and vaccines are required to prevent infections by this important human pathogen. Factor H binding protein (fHbp) is a key antigen that elicits protective immunity against the meningococcus and recruits the host complement regulator, fH. As the high affinity interaction between fHbp and fH could impair immune responses, we s...
Opsonization of bacteria by complement proteins is an important component of the immune response. The pathogenic bacterium Streptococcus pyogenes has evolved multiple mechanisms for the evasion of complement-mediated opsonization. One mechanism involves the binding of human regulators of complement activation such as factor H (FH) and FH-like protein 1 (FHL-1). Acquisition of these regulatory p...
Apoptotic cells are opsonized by complement components such as C1q and C3b, which increases their susceptibility to phagocytosis. Soluble complement inhibitors such as factor H (fH) also recognize apoptotic cells to minimize the pro-inflammatory effects of downstream complement activation. We used four radiolabeled protein constructs that span different regions of the 20 complement control prot...
BACKGROUND The meningococcal vaccine antigen, factor H (FH)-binding protein (FHbp), binds human complement FH. In human FH transgenic mice, binding decreased protective antibody responses. METHODS To investigate the effect of primate FH binding, we immunized rhesus macaques with a 4-component serogroup B vaccine (4CMenB). Serum FH in 6 animals bound strongly to FHbp (FHbp-FH(high)) and, in 6 ...
چکیده: زمینه و هدف: کلسترول بالای خانوادگی (FH) یک اختلال اتوزوم غالب است که عمدتاً به علت جهش های ژن LDLR و ApoB-100ایجاد می شود. تاکنون اساس مولکولی FH بطور مفصل در بسیاری از جمعیت ها تشریح شده است ولی هنوز اطلاعات مولکولی اندکی در ارتباط با FH در ایران موجود است. هدف از این مطالعه بررسی فراوانی 3 جهش شایع ژنی آپولیپوپروتئین B-100 ((ApoB-100 در یک جمعیت ایرانی است. روش بررسی: در این مطالعه...
Haemophilus influenzae is a Gram-negative human pathogen that resides in the upper respiratory tract. Encapsulated H. influenzae type b (Hib) and type f (Hif) are the most common serotypes associated with invasive disease. H. influenzae displays various strategies to circumvent the host innate immune response, including the bactericidal effect of the complement system. In this study, we identif...
چکیده: زمینه و هدف: هایپرکلسترولمی فامیلی (FH) بیماری غالب اتوزومال است که عمدتاً بدلیل جهش در ژن گیرنده لیپوپروتئین با دانسیته کم (LDLR) ایجاد می شود. این مطالعه با هدف بررسی تغییرات ژن LDLR بیماران مبتلا به کلسترول بالای خانوادگی در استان چهارمحال و بختیاری انجام شد. روش بررسی: در این مطالعه توصیفی- آزمایشگاهی، 57 بیمار مشکوک به FH غربالگری و با استفاده از روش PCR-SSCP جهش در پروموتر و اگز...
Neisseria meningitidis causes disease only in humans. An important mechanism underlying this host specificity is the ability of the organism to resist complement by recruiting the complement downregulator factor H (FH) to the bacterial surface. In previous studies, binding of FH to one of the major meningococcal FH ligands, factor H binding protein (FHbp), was reported to be specific for human ...
Some Borrelia species associated with Lyme disease bind the complement-regulatory protein factor H (fH), a process that may aid in immune evasion. In this report we demonstrate that some Borrelia species associated with relapsing fever bind fH, but not those associated with avian borreliosis and epizootic bovine abortion. Cell-bound fH was also found to mediate cleavage of exogenously supplied ...
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