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Citrulline And Rheumatoid Arthritis

Views: 33     Author: Site Editor     Publish Time: 2023-12-15      Origin: Site

Citrulline And Rheumatoid Arthritis

Brief introduction

Citrulline is a type of α- Amino acid, with the chemical formula C6H13N3O3, is named "citrulline" because it was first obtained from watermelon.

Basic characteristics

Chinese name: Citrulline

Foreign name: Citrulline

Nickname: (S) -2-amino-5-urea valerate carbamoyl ornithine

Chemical formula: C6H13N3O3

Molecular weight: 175.19

CAS login number: 372-75-8

EINECS login number: 206-759-6

Melting point: 222 ℃

Water solubility: soluble in water

Density: 1.289 g/cm ³

Appearance: White crystalline


Citrulline is generated from ornithine and aminoformyl phosphate in the urea cycle, or as a byproduct of arginine to NO catalyzed by nitric oxide synthase (NOS).

Rheumatoid arthritis and citrulline

Rheumatoid arthritis (RA) is an autoimmune disease with chronic synovitis as the main lesion. There are various anti citrullinated peptide antibodies (ACPAs) in the body, and RA can not only have joint symptoms but also be accompanied by extra-articular symptoms.

Citrullination can induce the production of APCAs in the body, which are important indicators for the diagnosis, prediction of disease progression, and prognosis of RA. ACPAs act on multiple cells in RA and mediate immune damage mechanisms.

Studies have shown that environmental factors such as smoking and air pollution can cause citrullination in lung epithelial cells, suggesting that protein citrullination is an early marker of intracellular damage. Research has confirmed that guanidine is associated with autophagy, neutrophil extracellular traps (NETosis), and apoptosis, and is involved in the pathogenesis of RA


Citrullination is a physiological post-transcriptional modification that converts arginine to citrulline under the catalysis of a Ca+dependent peptidylarginine deiminase (PAD). Protein modification can form new epitopes, produce new antigens that are different from self antigens, and promote antigen presenting cells (APCs) to recognize and express new antigens, thereby improving the immunogenicity of proteins.


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