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Whipple's disease: demonstration by immunofluorescence of similar bacterial antigens in macrophages from three cases
Abstract:
Although it is widely accepted that Whipple's disease is caused by microorganisms, there is little agreement as to the exact nature of those microbes. Several different types of bacteria have been reported from patients with Whipple's disease causing some workers to speculate that Whipple's disease may be due to a variety of microorganisms. Using an indirect immunofluorescence technique, we have demonstrated bacterial antigens in the granules of the foamy macrophages from three patients with Whipple's disease. The macrophages in each case stained with several types of antibacterial grouping sera. Jejunal biopsies from three normal subjects and one from a patient with celiac-like disease did not show significant reactions with any of the antisera. When these same antisera were reacted with homologous and heterologous bacteria, numerous cross-reactions were seen. However, each organism only reacted with certain antisera resulting in a distinctive pattern of reaction which could identify it. Therefore, if a different organism was present in each case of Whipple's disease, the antisera should give dissimilar reactions from case to case, but if the same type of microbe was present in each case, a similar pattern of reaction should be seen. In fact, the reactions were remarkably similar from case to case. These results suggest that a single, antigenically definable microorganism is present in the jejunal tissue of patients with Whipple's disease.
Insights
Whipple's disease is a bacterial infection, but the specific microbe is debated. This study found similar bacterial antigen patterns in patients, suggesting a single causative microorganism.
Area of Science:
- Microbiology
- Immunology
- Gastroenterology
Background:
- Whipple's disease is linked to microorganisms, but the specific causative agent remains unidentified.
- Previous research suggests a potential variety of microbes responsible for Whipple's disease.
- Foamy macrophages in affected tissues are a hallmark of the disease.
Purpose of the Study:
- To investigate the nature of the microorganisms implicated in Whipple's disease.
- To determine if a single or multiple types of bacteria cause Whipple's disease.
- To identify bacterial antigens within macrophages of Whipple's disease patients.
Main Methods:
- Indirect immunofluorescence technique was employed to detect bacterial antigens.
- Bacterial antigens were analyzed in jejunal biopsies from Whipple's disease patients.
- Antisera were used to identify bacterial strains and compare reactions across patient samples and controls.
Main Results:
- Bacterial antigens were detected in the granules of foamy macrophages from all tested Whipple's disease patients.
- Jejunal biopsies from normal subjects and a celiac-like disease patient showed no significant reactions.
- Cross-reactions between antisera and bacteria were observed, but each organism exhibited a unique reaction pattern.
- Remarkably similar reaction patterns were observed across Whipple's disease patient samples.
Conclusions:
- The findings strongly suggest the presence of a single, antigenically definable microorganism in the jejunal tissue of Whipple's disease patients.
- This implies that Whipple's disease is likely caused by a specific bacterium rather than a diverse group of microbes.
- Further characterization of this microorganism is warranted to confirm its role in the disease etiology.