A Derivative of Cationic Antimicrobial Protein Attenuates Lung Injury by Suppressing Cell Adhesion

Sadatomo Tasaka, Akitoshi Ishizaka, Tetsuya Urano, Koichi Sayama, Fumio Sakamaki, Hidetoshi Nakamura, Takeshi Terashima, Yasuhiro Waki, Kenzo Soejima, Morio Nakamura, Hiroaki Matsubara, Seitaro Fujishima, Minoru Kanazawa, James W. Larrick

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Cationic antimicrobial protein of 18 kD (CAP18) was identified and purified from rabbit granulocytes and shown to inhibit various activities of lipopolysaccharide (LPS). We investigated the effect of a 32-amino-acid C-terminal fragment of CAP18 (CAP18-derived peptide, CDP) on the pathogenesis of acute lung injury caused by intravenous endotoxin. Guinea pigs were divided into six groups: (l) saline control (n = 8), (2) CDP-alone (n = 8), (3) LPS-alone (n = 8), (4) LPS+CDP0m (n = 8), (5) LPS+CDP10m (n = 8), and (6) LPS+CDP60m (n = 8). A CDP dose of 0.2 mg/kg was injected at various time points after LPS injection. Lung wet-to-dry weight ratio, [125]albumin leakage in lung tissue and bronchoalveolar lavage (BAL) fluid, differential cell count in BAL fluid, and histopathologic features were examined 4 h after intravenous administration of 0.02 mg/kg of LPS. The LPS+CDP0m, and the LPS+CDP10m groups showed significantly attenuated lung injury compared to that seen in the LPS-alone group, however the LPS+CDP60m group revealed no attenuation of lung injury. The accumulation of peripheral white blood cells into pulmonary vasculature was attenuated only in the LPS+CDP0m but not in the LPS+CDP10m groups. We examined the effect of CDP on the expression of adhesion molecules using human umbilical vein endothelial cells, the result of which showed that CDP suppressed the LPS-induced expression of adhesion molecules in a dose-dependent manner. We conclude that CDP attenuates inflammatory cell migration into alveoli resulting in the attenuation of lung injury.

Original languageEnglish
Pages (from-to)738-744
Number of pages7
JournalAmerican journal of respiratory cell and molecular biology
Issue number6
Publication statusPublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Pulmonary and Respiratory Medicine
  • Clinical Biochemistry
  • Cell Biology


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