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Immunocytochemistry in the diagnosis of Whipple's disease
Abstract:
In six cases of Whipple's disease the characteristic macrophages could be stained immunocytochemically using a first layer antiserum to group B streptococci. Other types of periodic acid Schiff positive macrophages were negative. The staining appears to be due to a rhamnose containing polysaccharide as shown by a blocking test. The method may be useful for confirming the diagnosis in rectal biopsy and peripheral nodes, especially if small intestinal findings are atypical.
Insights
Immunocytochemistry using antiserum to group B streptococci can identify characteristic macrophages in Whipple's disease. This staining method, targeting a specific polysaccharide, aids in diagnosing Whipple's disease, particularly with atypical findings.
Area of Science:
- Microbiology
- Immunohistochemistry
- Gastroenterology
Background:
- Whipple's disease is a rare systemic bacterial infection characterized by macrophages containing periodic acid-Schiff (PAS)-positive material.
- The causative agent of Whipple's disease has been identified as Tropheryma whipplei, a bacterium.
- Diagnosis often relies on small intestinal biopsy, but atypical presentations can complicate diagnosis.
Purpose of the Study:
- To investigate the utility of immunocytochemical staining for group B streptococci in diagnosing Whipple's disease.
- To determine if the observed staining is specific to the characteristic macrophages in Whipple's disease.
- To evaluate the potential of this method for confirming the diagnosis in challenging cases.
Main Methods:
- Immunocytochemical staining of macrophages from six Whipple's disease cases using a first-layer antiserum to group B streptococci.
- Comparison with staining of other PAS-positive macrophages.
- Blocking tests using a rhamnose-containing polysaccharide to confirm the specificity of the staining.
Main Results:
- Characteristic macrophages in Whipple's disease cases showed positive staining with the group B streptococci antiserum.
- Other PAS-positive macrophages did not exhibit this specific staining.
- The staining was confirmed to be due to a rhamnose-containing polysaccharide.
Conclusions:
- Immunocytochemical staining for group B streptococci can specifically identify macrophages in Whipple's disease.
- This method may serve as a valuable diagnostic tool for Whipple's disease, especially when small intestinal findings are atypical.
- The technique shows promise for confirming diagnoses in rectal biopsies and peripheral lymph nodes.