Results 21 to 30 of about 5,264 (155)

Properdin and Factor H: Opposing players on the alternative complement pathway see-saw

Frontiers in Immunology, 2013
Properdin and factor H are two key regulatory proteins having opposite functions in the alternative complement pathway. Properdin up-regulates the alternative pathway by stabilising the C3bBb complex, whereas factor H down-regulates the pathway by ...
Lubna eKouser, Munirah eAbdul-Aziz, Munirah eAbdul-Aziz, Annapurna eNayak, Cordula M Stover, Robert B Sim, Robert B Sim, Uday eKishore   +7 more
doaj   +1 more source

Properdin Is a Key Player in Lysis of Red Blood Cells and Complement Activation on Endothelial Cells in Hemolytic Anemias Caused by Complement Dysregulation

Frontiers in Immunology, 2020
The complement system alternative pathway (AP) can be activated excessively in inflammatory diseases, particularly when there is defective complement regulation.
Jin Y. Chen, Neeti S. Galwankar, Heather N. Emch, Smrithi S. Menon, Claudio Cortes, Joshua M. Thurman, Samuel A. Merrill, Robert A. Brodsky, Viviana P. Ferreira   +8 more
doaj   +1 more source

Properdin Is a Modulator of Tumour Immunity in a Syngeneic Mouse Melanoma Model

Medicina, 2021
Background and Objectives: Tumours are often low immunogenic. The role of complement, an innate immune defence system, in tumour control has begun to be elucidated, but findings are conflicting. A role for properdin, an amplifier of complement activation,
Izzat A. M. Al-Rayahi, Lee R. Machado, Cordula M. Stover   +2 more
doaj   +1 more source

A novel antibody against human properdin inhibits the alternative complement system and specifically detects properdin from blood samples.

PLoS ONE, 2014
The complement system is an essential part of the innate immune system by acting as a first line of defense which is stabilized by properdin, the sole known positive regulator of the alternative complement pathway. Dysregulation of complement can promote
Diana Pauly, Benedikt M Nagel, Jörg Reinders, Tobias Killian, Matthias Wulf, Susanne Ackermann, Boris Ehrenstein, Peter F Zipfel, Christine Skerka, Bernhard H F Weber   +9 more
doaj   +1 more source

Structure and function of a family of tick-derived complement inhibitors targeting properdin

Nature Communications, 2022
Properdin is the only known positive regulator of the human complement system, stabilising the convertase C3 in the alternative pathway of complement activation.
Katharina Braunger, Jiyoon Ahn, Matthijs M. Jore, Steven Johnson, Terence T. L. Tang, Dennis V. Pedersen, Gregers R. Andersen, Susan M. Lea   +7 more
doaj   +1 more source

Local release of properdin in the cellular microenvironment: Role in pattern recognition and amplification of the alternative pathway of complement

Frontiers in Immunology, 2013
Properdin, the only positive regulatory protein of the complement system, acts as both a stabilizer of the alternative pathway convertases and as a selective pattern recognition molecule of certain microorganisms and host cells (i.e.
Claudio eCortes, Claudio eCortes, Jennifer A Ohtola, Gurpanna eSaggu, Viviana Patricia Ferreira   +4 more
doaj   +1 more source

Properdin levels in human sepsis

Frontiers in Immunology, 2015
Properdin is a normal serum protein which increases the production of complement activation products by binding to C3b integral to convertase complexes and amplifying their activity at the site of activation.
Cordula M Stover, John eMcDonald, Simon eByrne, David G Lambert, Jonathan eThompson   +4 more
doaj   +1 more source

Complement Properdin Regulates the Metabolo-Inflammatory Response to a High Fat Diet

Medicina, 2020
Background and objectives: Overnutrition leads to a metabolic and inflammatory response that includes the activation of Complement. Properdin is the only amplifier of complement activation and increases the provision of complement activation products ...
Rόisín C. Thomas, Ramiar Kheder, Hasanain Alaridhee, Naomi Martin, Cordula M. Stover   +4 more
doaj   +1 more source

Complement Initiation Varies by Sex in Intestinal Ischemia Reperfusion Injury

Frontiers in Immunology, 2021
Intestinal ischemia reperfusion (IR)-induced tissue injury represents an acute inflammatory response with significant morbidity and mortality. The mechanism of IR-induced injury is not fully elucidated, but recent studies suggest a critical role for ...
Miaomiao Wu, Miaomiao Wu, Jennifer M. Rowe, Sherry D. Fleming   +3 more
doaj   +1 more source

Variability and action mechanism of a family of anticomplement proteins in Ixodes ricinus. [PDF]

PLoS ONE, 2008
BACKGROUND: Ticks are blood feeding arachnids that characteristically take a long blood meal. They must therefore counteract host defence mechanisms such as hemostasis, inflammation and the immune response.
Bernard Couvreur, Jérôme Beaufays, Cédric Charon, Kathia Lahaye, François Gensale, Valérie Denis, Benoît Charloteaux, Yves Decrem, Pierre-Paul Prévôt, Michel Brossard, Luc Vanhamme, Edmond Godfroid   +11 more
doaj   +1 more source