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Related Concept Videos

Complement System01:27

Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Complementation Tests00:49

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
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The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
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Elements of Block Diagrams01:25

Elements of Block Diagrams

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Block diagrams serve as a visual representation of the input-output relationships within a system. An illustrative example is a heating system, where the set temperature activates the furnace to warm the room to the desired level. Block diagrams are versatile, modeling linear systems through Laplace transform variables and nonlinear systems using time domain variables.
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Frustration occurs when people are obstructed or prevented from achieving a desired goal or fulfilling a perceived need. For example, when someone's input is ignored in a discussion, it can lead to feelings of frustration. Conflict, however, arises from opposing interests, goals, or actions. Conflicts can take various forms based on the nature of these opposing desires or goals.
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In a spring-mass-damper system, the second-order differential equation describes the dynamic behavior of the system. When transformed into the Laplace domain under zero initial conditions, this equation can be effectively analyzed and manipulated. The transformation into the Laplace domain converts differential equations into algebraic equations, simplifying the process of isolating the output.
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Depletion of Specific Cell Populations by Complement Depletion
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Novel Approaches to Block Complement.

Georg A Böhmig1, Markus Wahrmann1, Farsad Eskandary1

  • 1Division of Nephrology and Dialysis, Department of Medicine III, Medical University of Vienna, Vienna, Austria.

Transplantation
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

Targeting the complement system, particularly the classical pathway (CP), offers new therapeutic strategies for preventing transplant rejection. Inhibiting C1 components shows promise in blocking antibody-mediated rejection and improving graft survival.

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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
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Area of Science:

  • Immunology
  • Transplantation Biology

Background:

  • The complement system plays a significant role in transplant injury.
  • While terminal complement blockade (e.g., eculizumab) is effective for early rejection, its efficacy in chronic rejection is limited.
  • Upstream complement activation, particularly C3 cleavage, generates molecules contributing to rejection.

Purpose of the Study:

  • To explore the therapeutic potential of targeting the classical pathway (CP) of complement activation in antibody-mediated rejection.
  • To evaluate strategies for inhibiting CP activation, including C1-based therapies and apheresis.

Main Methods:

  • Review of existing evidence on complement inhibition in transplantation.
  • Discussion of therapeutic strategies targeting C1 components, such as C1-inhibitor and anti-C1s antibodies (BIVV009).
  • Consideration of modified apheresis techniques for complement depletion.

Main Results:

  • Inhibition of antibody-triggered CP activation may be beneficial in antibody-mediated rejection.
  • Therapeutic use of C1-inhibitor and anti-C1s antibody BIVV009 are under clinical evaluation.
  • Apheresis techniques can effectively deplete complement components like C1q.

Conclusions:

  • Targeting the classical pathway offers a promising approach to counteract complement-mediated transplant rejection.
  • Further clinical evaluation of CP-inhibiting strategies and other complement-targeting therapies is needed to improve graft survival.