Clinical and basic studies on the G-1 column, a new extracorporeal therapeutic device effective in controlling rheumatoid arthritis

Inflamm Res. 1998 Oct:47 Suppl 3:S166-76. doi: 10.1007/s000110050311.


The G-1 column, which is filled with cellulose acetate spherical beads of 2 mm diameter, is a new type of extracorporeal perfusion device originally designed to remove granulocytes from the venous circulation of patients with rheumatoid arthritis. A dramatic improvement in clinical symptoms was seen after treatment with the G-1 column in two successive clinical trials. Early effects include pain relief, reduction in the swollen joints, and a continued decrease in inflammation as a late effect. The results were further confirmed in the adjuvant arthritic rat model. G-1 beads adsorb some amounts of platelets at the beginning and then about a quarter of circulating neutrophils, monocytes, natural killer cells, and B cells, but not T cells. Various factors released from blood cells during transit through the column must have influenced the cells including lymphocytes which passed through the column. G-column actually eliminates some parts of aggressive leukocytes, but a more interesting story is the modification of blood components, which occurred in the G-1 column, and when returned to the patients, may have ameliorated the unbalanced homeostatic network and induced acceleration of healing.

Publication types

  • Review

MeSH terms

  • Animals
  • Arthritis, Rheumatoid / immunology
  • Arthritis, Rheumatoid / therapy*
  • Cell Separation / methods
  • Cellulose / analogs & derivatives
  • Cytapheresis / methods
  • Extracorporeal Circulation / instrumentation*
  • Humans
  • Microspheres
  • Neutrophils
  • Rats


  • acetylcellulose
  • Cellulose