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Immunoprecipitation

Immunoprecipitation

Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...

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Sublingual Immunotherapy as an Alternative to Induce Protection Against Acute Respiratory Infections

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SPECIFIC PRECIPITATION AND MOUSE PROTECTION IN TYPE I ANTIPNEUMOCOCCUS SERA.

M Heidelberger¹, R H Sia, F E Kendall

¹Laboratories of the Department of Practice of Medicine, Presbyterian Hospital and College of Physicians and Surgeons, New York.

The Journal of Experimental Medicine

|October 30, 2009

Summary

This study introduces a fast, simple method to measure specific protein in Type I antipneumococcus sera. This protein level closely matches the protective antibody units, suggesting a reliable alternative to mouse protection tests for serum titration.

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Antigen-Capture Enzyme-Linked Immunosorbent Assay for Specific Detection of Mycoplasma pneumoniae

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Area of Science:

Immunology
Microbiology
Biochemistry

Background:

Antipneumococcus sera are crucial for treating pneumococcal infections.
Accurate titration of these sera is essential for clinical efficacy.
Existing methods like the mouse protection test can be time-consuming and complex.

Purpose of the Study:

To develop a rapid, simple, and economical method for determining specific precipitable protein in Type I antipneumococcus sera.
To establish a correlation between specific precipitable protein levels and mouse protection units.
To propose this new method as a replacement for the mouse protection test in serum standardization.

Main Methods:

A novel method for the approximate determination of specifically precipitable protein in Type I antipneumococcus sera was developed.
Comparative analysis was performed between the new protein determination method and the standard mouse protection test.
A method for preparing highly purified specific polysaccharide of Type I pneumococcus was also detailed.

Main Results:

A close parallel was observed between the quantity of specifically precipitable protein and the number of mouse protection units across various Type I antipneumococcus sera.
The new method demonstrated consistent results, proving to be rapid, simple, and economical.
Highly purified specific polysaccharide of Type I pneumococcus was successfully prepared.

Conclusions:

The developed method for measuring specifically precipitable protein offers a reliable and efficient alternative to the mouse protection test.
This method can be utilized for the titration of standard sera and the comparison of other sera against a standard.
The findings support the adoption of this protein-based assay for routine serum analysis in Type I antipneumococcus serology.