AI Article Synopsis

  • Lecithin-cholesterol acyltransferase (LCAT) is essential for converting premature high-density lipoprotein (HDL) to its mature form, and its reduction leads to low HDL cholesterol levels.
  • Recent cases, particularly from Japan, have identified acquired HDL deficiency caused by IgG autoantibodies against LCAT, specifically IgG4.
  • The reported cases introduce the idea of "IgG4 autoimmune disease" by correlating the presence of IgG4 autoantibodies with clinical symptoms and renal histopathology.

Article Abstract

Lecithin-cholesterol acyltransferase (LCAT) plays a significant role in the progression from premature to mature high-density lipoprotein (HDL) in circulation. Consequently, primary or secondary LCAT deletion or reduction naturally results in low serum HDL cholesterol levels. Recently, rare cases of acquired HDL deficiency with LCAT autoantibodies have been reported, mainly from Japan, where LCAT autoantibodies of immunoglobulin G (IgG) caused the HDL deficiency. Here to our knowledge, we report for the first time two cases of acquired HDL deficiency caused by IgG4 linked LCAT autoantibodies with or without a high serum IgG4 level. Furthermore, these cases can extend to a new concept of "IgG4 autoimmune disease" from the viewpoint of verifying the serum autoantibody and/or renal histopathology.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10406652PMC
http://dx.doi.org/10.5551/jat.63616DOI Listing

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