Levels of Total Hemolytic Complement Activity in Paired Maternal Newborn Sheep Sera

Abstract Heavy Smokers appeared to be less resistant to infection, such as bacteria, viruses, and parasites. Many studies have examined the complement components concentrations than compared with normal people and ignored the functional sequencing of complement components, our study included the determination of complement activity by using Sheep red blood cells (SRBCs) as antigen and extracting the hemolytic activity (50%) of complement compounds, and because of difficulty of this method we using statistical analysis program (SPSS 23) and derived the inverse equation which gives the decomposition percentage (1-100%) of complement components by using five serum dilutions only. The total hemolytic complement activity (CH50) and its C3 and C4 fractions were determined in 30 heavy smokers. The results were compared with a control group that contained 30 persons matched in age and sex. Generally, both C3 and C4 concentrations were increased in smoker's individual in compared with the control group. However, when the independent t-test has applied the differences in the C3 and C4 levels in the control group (healthy individuals) and in the smoker group were found to be statistically insignificant but the inverse equation showed a 7% reduction in CH50 in smokers compared with the control group, where 18% reduction was observed. Our current study suggests that the complement components of the heavy smokers suffer from a significant dysfunction in the function, although the concentration of the basic components in the serum is parallel with normal values.

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Automated homogeneous liposome-based assay system for total complement activity

Clinical Chemistry ◽

10.1093/clinchem/41.4.586 ◽

1995 ◽

Vol 41 (4) ◽

pp. 586-590 ◽

Cited By ~ 25

Author(s):

S Yamamoto ◽

K Kubotsu ◽

M Kida ◽

K Kondo ◽

S Matsuura ◽

...

Keyword(s):

Serum Proteins ◽

M Protein ◽

Homogeneous Population ◽

Complement Activity ◽

Activity Test ◽

Human Sera ◽

Total Complement ◽

Hemolytic Complement Activity ◽

Glucose 6 Phosphate Dehydrogenase

Abstract We developed an automated homogeneous immunoassay, based on immune lysis of dinitrophenyl (DNP)-labeled liposomes, for measuring total complement activity. Liposome lysis caused by complement activity was detected spectrophotometrically from entrapped glucose-6-phosphate dehydrogenase activity. Complement activity in human sera was quantified by comparison with a calibration curve. For ease of application to fully automated routine clinical analyzers, we adopted a two-reagent system, one reagent containing a homogeneous population of small DNP-labeled liposomes and one containing antibody/substrate. This system required calibration only once a week. Within-run and between-run CVs were 0.4-1.3% (n = 10) and 1.8-4.7% (n = 10), respectively. Serum results were linear upon dilution (with saline) over a twofold range. Bilirubin, hemoglobin, Intrafat, and serum proteins such as rheumatoid factor, M protein, IgG, and IgA did not affect the assay results. The results (y) correlated well with those from a hemolytic complement activity test (x): y = 1.05x - 1.14, r = 0.92, on 66 samples in the range < 10- > 50 kU/L. This method should therefore be of great use for the determination of complement activity.

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