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Fibril-associated Collagen01:11

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Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of...
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Updated: Mar 11, 2026

Experimental Approaches for Biochemical Analysis of Glial Fibrillary Acidic Protein and Its Disease-associated Variants
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Experimental Approaches for Biochemical Analysis of Glial Fibrillary Acidic Protein and Its Disease-associated Variants

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Cryofibrinogen-Associated Glomerulonephritis.

Sanjeev Sethi1, Ralph Yachoui2, David L Murray1

  • 1Division of Anatomic Pathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN.

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|November 22, 2016
PubMed
Summary
This summary is machine-generated.

Cryofibrinogen, a cold-precipitating protein, can cause kidney disease. This study details two cases of cryofibrinogen-associated glomerulonephritis, highlighting unique biopsy findings and treatment strategies.

Keywords:
Cryofibrinogencryofibrinogenemiacryoprecipitateelectron microscopyfibrinogenkidney biopsykidney diseaselight microscopymembranoproliferative glomerulonephritisproteomics

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Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy
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Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy
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Analysis of β-Amyloid-induced Abnormalities on Fibrin Clot Structure by Spectroscopy and Scanning Electron Microscopy

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Area of Science:

  • Nephrology
  • Hematology
  • Pathology

Background:

  • Cryofibrinogen is a cryoprotein precipitating upon plasma cooling, distinct from cold serum cryoprecipitates.
  • While often asymptomatic, cryofibrinogenemia is linked to thromboembolic events, particularly cutaneous manifestations.
  • Kidney involvement in cryofibrinogenemia is under-recognized but significant.

Observation:

  • Two patients with cryofibrinogen-related kidney disease presented with proteinuria and hematuria.
  • One patient exhibited severe skin lesions including ulcers and palpable purpura.
  • Kidney biopsies revealed membranoproliferative glomerulonephritis without immunoglobulin deposition, but with fibrinogen staining and unique ultrastructural findings.

Findings:

  • Kidney biopsies showed organized deposits of multilayered tubular and fine fibrillary structures.
  • Ultrastructural analysis of patient plasma cryoprecipitate matched the kidney biopsy findings.
  • Proteomic analysis confirmed fibrinogen in the cryoprecipitate, and laboratory tests confirmed cryofibrinogenemia in both patients.

Implications:

  • This study highlights cryofibrinogen-associated glomerulonephritis as an under-recognized renal pathology.
  • Accurate diagnosis requires awareness of cryofibrinogen and specific laboratory and biopsy evaluations.
  • Treatment involves immunosuppression, corticosteroids, and avoidance of cold exposure, leading to improved outcomes.