Abstract:
STUDY OBJECTIVES:To investigate the roles of human alpha-defensin (HAD), human beta-defensin (HBD)-1, and HBD-2, novel antimicrobial peptides, in patients with Mycobacterium avium-intracellulare infection (MAI). PATIENTS:The study included 25 patients (10 men) with MAI who visited our hospital between June 1998 and August 1999. MEASUREMENTS AND RESULTS:In patients with pulmonary MAI, we measured HAD and HBD-1, and HBD-2 levels in plasma and in BAL fluid (BALF) by radioimmunoassay. Plasma concentrations of HAD and HBD-2 in those patients were higher than those in control subjects, whereas HBD-1 levels were similar to those in the control subjects. High levels of HAD and HBD-2, but not HBD-1, also were observed in the BALF of MAI patients. There was a positive correlation between HAD and interleukin (IL)-8 concentrations in the BALF of patients with MAI. BALF HBD-2 concentrations also correlated positively with those of plasma HBD-2 and BALF IL-1 beta in MAI patients. Patients with cavity formation on the chest roentgenogram had higher HAD and HBD-2 levels in their BALF than those of patients without cavity formation. Treatment with clarithromycin combined with two or three other antibiotics, including ethambutol, rifampicin, ofloxacin, or ciprofloxacin, for at least 6 months resulted in a significant fall in plasma HBD-2 concentrations in responders, but not in nonresponders. CONCLUSION:Our findings suggest that HAD and HBD-2 may participate in host defense and local remodeling of the respiratory tract in patients with MAI and that plasma HBD-2 levels may be a useful marker of disease activity in patients with pulmonary MAI.
journal_name
Chestjournal_title
Chestauthors
Ashitani J,Mukae H,Hiratsuka T,Nakazato M,Kumamoto K,Matsukura Sdoi
10.1378/chest.119.4.1131subject
Has Abstractpub_date
2001-04-01 00:00:00pages
1131-7issue
4eissn
0012-3692issn
1931-3543pii
S0012-3692(15)52071-0journal_volume
119pub_type
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