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Increased content of microbicidal cationic peptides in rabbit alveolar macrophages elicited by complete Freund
Abstract:
We measured the microbicidal peptides MCP-1 and MCP-2 in rabbit alveolar macrophages (AM), comparing rabbits pretreated with complete Freund adjuvant with untreated control animals. Levels of MCP-1 increased from 4.7 +/- 0.6 microgram/10(7) resident AM to 13.2 +/- 0.1 microgram/10(7) complete Freund adjuvant-elicited AM. MCP-2 levels rose from 1.8 +/- 0.1 microgram/10(7) resident AM to 7.3 +/- 0.4 microgram/10(7) complete Freund adjuvant-elicited AM. The activities of five lysosomal hydrolases (beta-D-glucuronidase, beta-D-galactosidase, acid phosphatase, N-acetyl-beta-D-galactosaminidase, and N-acetyl-beta-D-glucosaminidase) were 44 to 96% higher in complete Freund adjuvant-elicited AM, and lysozyme activity was three- to fourfold higher. As MCP-1 and MCP-2 are major constituents of rabbit AM and exhibit potent antibacterial and antifungal properties, they may contribute to the expression of microbicidal activity in both resident and activated states.
Insights
Microbicidal peptides (MCP-1 and MCP-2) significantly increased in rabbit alveolar macrophages after complete Freund adjuvant pretreatment. These peptides, along with enhanced lysosomal enzyme activity, contribute to the immune cells
Area of Science:
- Immunology
- Cell Biology
- Microbiology
Background:
- Alveolar macrophages (AM) play a crucial role in lung immunity.
- Microbicidal peptides are key components of the innate immune system.
- Complete Freund adjuvant (CFA) is a potent immune stimulator.
Purpose of the Study:
- To quantify microbicidal peptides MCP-1 and MCP-2 in rabbit AM.
- To compare peptide levels in CFA-treated versus untreated rabbits.
- To assess the impact of CFA on lysosomal hydrolase and lysozyme activity in AM.
Main Methods:
- Rabbit alveolar macrophages were isolated from CFA-pretreated and control groups.
- Levels of MCP-1 and MCP-2 were measured using quantitative assays.
- Activities of five lysosomal hydrolases and lysozyme were determined.
Main Results:
- MCP-1 levels increased from 4.7 to 13.2 µg/10^7 AM in CFA-elicited AM.
- MCP-2 levels rose from 1.8 to 7.3 µg/10^7 AM in CFA-elicited AM.
- Lysosomal hydrolase activities were 44-96% higher, and lysozyme activity was 3-4 fold higher in CFA-elicited AM.
Conclusions:
- CFA pretreatment significantly upregulates MCP-1 and MCP-2 in rabbit AM.
- Elevated lysosomal enzyme and lysozyme activity accompanies peptide increase.
- MCP-1 and MCP-2 likely contribute to the enhanced microbicidal activity of activated AM.