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Introduction to Membrane Proteins01:16

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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and...
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A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries...
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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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Unmet challenges in membranous nephropathy.

David J Salant1

  • 1Department of Medicine, Boston University School of Medicine and Section of Nephrology, Boston Medical Center, Boston, Massachusetts, USA.

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Primary membranous nephropathy research has advanced, identifying phospholipase A2 receptor (PLA2R) and THSD7A as antigens. However, key questions about their function and disease triggers remain, hindering new treatment development.

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Area of Science:

  • Nephrology
  • Immunology
  • Genetics

Background:

  • Primary membranous nephropathy (PMN) involves autoantibodies against podocyte antigens.
  • Phospholipase A2 receptor (PLA2R) is the major autoantigen, with Thrombospondin type I domain-containing 7A (THSD7A) identified as a minor antigen.

Purpose of the Study:

  • To review recent advances in understanding PMN immunopathogenesis and genetics.
  • To identify knowledge gaps and opportunities for developing targeted therapies.

Main Methods:

  • Literature review of over 680 articles since 2009.
  • Analysis of genetic associations, autoantibody roles, and complement system involvement.

Main Results:

  • Established genetic links to PLA2R1 and MHC alleles.
  • Demonstrated clinical utility of anti-PLA2R assays and epitope spreading.
  • Identified THSD7A as a PMN antigen and confirmed disease transfer via anti-THSD7A sera in mice.
  • Highlighted unknown physiology of PLA2R/THSD7A and unexplained loss of self-tolerance.

Conclusions:

  • Despite progress, the normal function of PLA2R and THSD7A in podocytes is unknown.
  • Mechanisms of autoantibody-induced podocyte injury and complement activation require further elucidation.
  • Current treatments for PMN remain largely unchanged, emphasizing the need for novel therapeutic strategies.