Results 61 to 70 of about 792,617 (213)

Human Complement Receptors for C3b (CR1) and C3d (CR2)

Journal of Investigative Dermatology, 1985
The human C3b receptor (CR1) is a polymorphic glycoprotein comprised of a single polypeptide chain. Of the 4 allotype forms of CR1 that have been described, the 2 most common have Mr's of 250,000 and 260,000, and are regulated by alleles having frequencies in a Caucasian population of 81.5% and 18.5%, respectively.
openaire   +2 more sources

Retraction Note: The structure of complement C3b provides insights into complement activation and regulation [PDF]

Nature, 2016
This Letter is retracted by Nature. This follows an investigation by the University of Alabama at Birmingham, Alabama, USA, of structures deposited into the Protein Data Bank under accession 2HR0 by H. M. Krishna Murthy. Co-authors who agree with the Retraction.
A. Abdul Ajees, K. Gunasekaran, John E. Volanakis, Sthanam. V. L. Narayana, Girish J. Kotwal, H. M. Krishna Murthy   +5 more
openaire   +1 more source

Inflammatory and Immunological Basis of Periodontal Diseases

Journal of Periodontal Research, EarlyView.
The periodontal lesion emerges as an evolving immunological battlefield, where host–microbiome interactions, dysregulated immune responses, fragile resolution mechanisms, and inflammophilic dysbiosis converge to shift the balance from homeostasis to unrestrained tissue destruction.
Giacomo Baima, Marion Arce, Mario Romandini, Thomas Van Dyke   +3 more
wiley   +1 more source

The Staphylococcus aureus protein Sbi acts as a complement inhibitor and forms a tripartite complex with host complement Factor H and C3b.

PLoS Pathogens, 2008
The Gram-positive bacterium Staphylococcus aureus, similar to other pathogens, binds human complement regulators Factor H and Factor H related protein 1 (FHR-1) from human serum.
Katrin Haupt, Michael Reuter, Jean van den Elsen, Julia Burman, Steffi Hälbich, Julia Richter, Christine Skerka, Peter F Zipfel   +7 more
doaj   +1 more source

Functional Analysis of Variants in Complement Factor I Identified in Age-Related Macular Degeneration and Atypical Hemolytic Uremic Syndrome

Frontiers in Immunology, 2022
Complement factor I (FI) is a central inhibitor of the complement system, and impaired FI function increases complement activation, contributing to diseases such as age-related macular degeneration (AMD) and atypical hemolytic uremic syndrome (aHUS ...
Sarah de Jong, Anita de Breuk, Bjorn Bakker, Suresh Katti, Carel B. Hoyng, Sara C. Nilsson, Anna M. Blom, Lambert P. van den Heuvel, Lambert P. van den Heuvel, Lambert P. van den Heuvel, Anneke I. den Hollander, Anneke I. den Hollander, Elena B. Volokhina, Elena B. Volokhina, Elena B. Volokhina   +14 more
doaj   +1 more source

Autoimmunity and Periodontitis

Journal of Periodontal Research, EarlyView.
In a microbe‐driven inflammatory environment, peptidyl‐arginine deiminase (PAD) enzymes from neutrophils and Porphyromonas gingivalis citrullinate both microbial and self‐antigens. B cell presentation of citrullinated or self‐mimicking epitopes activates T cells that assist B cells in antibody isotype switching, affinity maturation, epitope spreading ...
Massimo Costalonga, Vivek Thumbigere‐Math, Mark C. Herzberg   +2 more
wiley   +1 more source

Intracellular degradation of the complement C3b/C4b receptor in the absence of ligand.

Journal of Biological Chemistry, 1988
Human neutrophils (PMN) respond to various soluble stimuli by translocating intracellular complement C3b/C4b receptors (CR1) to the cell surface. Ligand-independent internalization of surface CR1 has been demonstrated previously, but the fate of total ...
J. Turner, A. Tartakoff, M. Berger
semanticscholar   +1 more source

The Murine Factor H-Related Protein FHR-B Promotes Complement Activation

Frontiers in Immunology, 2017
Factor H-related (FHR) proteins consist of varying number of complement control protein domains that display various degrees of sequence identity to respective domains of the alternative pathway complement inhibitor factor H (FH). While such FHR proteins
Marcell Cserhalmi, Ádám I. Csincsi, Zoltán Mezei, Anne Kopp, Mario Hebecker, Barbara Uzonyi, Mihály Józsi   +6 more
doaj   +1 more source

Human factor H-related protein 2 (CFHR2) regulates complement activation. [PDF]

PLoS ONE, 2013
Mutations and deletions within the human CFHR gene cluster on chromosome 1 are associated with diseases, such as dense deposit disease, CFHR nephropathy or age-related macular degeneration. Resulting mutant CFHR proteins can affect complement regulation.
Hannes U Eberhardt, Denise Buhlmann, Peter Hortschansky, Qian Chen, Sascha Böhm, Markus J Kemper, Reinhard Wallich, Andrea Hartmann, Teresia Hallström, Peter F Zipfel, Christine Skerka   +10 more
doaj   +1 more source

CipA mediates complement resistance of Acinetobacter baumannii by formation of a factor I-dependent quadripartite assemblage

Frontiers in Immunology, 2022
Multidrug-resistant Acinetobacter baumannii is known to be one of the leading pathogens that cause severe nosocomial infections. To overcome eradication by the innate immune system during infection, A.
Julia I. Ries, Marie Heß, Noura Nouri, Thomas A. Wichelhaus, Stephan Göttig, Franco H. Falcone, Peter Kraiczy   +6 more
doaj   +1 more source