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Acetyl-CoA:lyso-platelet-activating factor acetyltransferase activity in neutrophils from asthmatic patients and normal subjects
- Source :
- Clinical science (London, England : 1979). 85(4)
- Publication Year :
- 1993
-
Abstract
- 1. Platelet-activating factor is a putative mediator of inflammation in asthma and the enzyme acetyl-CoA:lyso-platelet-activating factor acetyltransferase appears to be important in regulating platelet-activating factor production by leucocytes. To determine whether there are differences in acetyl-transferase activity between asthmatic patients and normal subjects, enzyme activity was assayed in neutrophil lysates from atopic asthmatic patients (n = 20), aspirin-sensitive asthmatic patients (n = 12) and healthy, non-atopic, non-asthmatic control subjects (n = 20), both basally and after stimulation with the calcium ionophore A23187. 2. For a range of acetyl-CoA concentrations, acetyl-transferase activity (nmol of [acetyl-3H]PAF min−1 mg−1 of protein) in unstimulated neutrophils from atopic asthmatic patients was significantly higher than that for normal subjects (P = 0.038) and the mean Vmax. for atopic asthmatic patients [18.4 (SD 6.9) nmol min−1 mg−1 of protein] was significantly greater than that for the control subjects [14.9 (SD 4.6) nmol min−1 mg−1 of protein P 3. The mean ratio Vmax. stimulated/ Vmax. unstimulated for acetyltransferase from atopic asthmatic patients (1.71, SD 0.45) was significantly less than that for the normal subjects (2.13, SD 0.63, P 4. Vmax. stimulated was significantly correlated with Vmax. unstimulated in atopic asthmatic patients (P = 0.0001) and aspirin-sensitive asthmatic patients (P = 0.012), but not in normal subjects (P = 0.071). 5. These results suggest that, in atopic asthmatic patients, neutrophils may be subject to chronic priming in vivo for increased acetyltransferase activity and capacity for platelet-activating factor synthesis. In these patients the increased platelet-activating factor production may be contributing significantly to the degree of inflammation associated with their asthma.
- Subjects :
- Adult
Male
medicine.medical_specialty
Neutrophils
Neutrophile
Stimulation
Inflammation
Drug Hypersensitivity
In vivo
Acetyltransferases
Internal medicine
medicine
Humans
Asthma
Aged
biology
Aspirin
Chemistry
Respiratory disease
General Medicine
Middle Aged
medicine.disease
Enzyme assay
Endocrinology
Acetyltransferase
biology.protein
Female
medicine.symptom
Subjects
Details
- ISSN :
- 01435221
- Volume :
- 85
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Clinical science (London, England : 1979)
- Accession number :
- edsair.doi.dedup.....55cd7a7a75a40b441d23fac0935f193c