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Immunofluorescent staining of leptospires in pepsin treated histologic sections
Abstract:
A standard immunofluorescent method was modified for the staining of leptospires in formalin fixed, paraffin embedded tissues. Routine histologic sections were deparaffinized and treated with pepsin prior to staining. Pepsin treatment greatly enhanced subsequent staining of leptospires in naturally infected bovine and porcine tissues as well as in artificially infected tissues. Leptospires in naturally infected bovine tissues were usually undetectable in untreated sections but clearly visible in stained pepsin-treated sections. Naturally infected porcine kidney usually contained high levels of leptospiral antigen which could be stained without prior pepsin treatment. However, pepsin treatment of porcine tissues greatly increased the amount of leptospiral antigen detectable and made individual leptospires more conspicuous. The staining method could employ a single antiserum for the staining of leptospires from 13 serogroups. Also, leptospires could be stained in tissues stored in formalin for more than 14 months and in 26-year-old paraffin embedded tissues.
Insights
A modified immunofluorescence technique enhances the detection of leptospires in formalin-fixed tissues. Pepsin treatment significantly improves the visibility of these bacteria in bovine and porcine samples, aiding in disease diagnosis.
Area of Science:
- Veterinary Pathology
- Microbiology
- Immunohistochemistry
Background:
- Leptospirosis is a significant zoonotic disease caused by pathogenic spirochetes of the genus Leptospira.
- Accurate identification of leptospires in tissue samples is crucial for diagnosis and epidemiological studies.
- Standard immunofluorescence methods can be limited in sensitivity for detecting leptospires in fixed tissues.
Purpose of the Study:
- To optimize an immunofluorescence staining method for enhanced detection of leptospires in formalin-fixed, paraffin-embedded (FFPE) tissues.
- To evaluate the efficacy of pepsin treatment in improving leptospiral antigen visualization.
- To assess the applicability of the method across different animal tissues and storage durations.
Main Methods:
- Modification of a standard immunofluorescence protocol.
- Deparaffinization and pepsin digestion of routine histologic sections.
- Staining with a single antiserum capable of detecting multiple leptospiral serogroups.
- Application to naturally and artificially infected bovine and porcine tissues.
Main Results:
- Pepsin treatment significantly enhanced leptospiral staining in naturally infected bovine tissues, rendering previously undetectable bacteria visible.
- In porcine tissues, pepsin treatment increased the detectability and conspicuousness of leptospiral antigen.
- The method successfully stained leptospires in tissues stored in formalin for over 14 months and in 26-year-old FFPE tissues.
- A single antiserum allowed for the detection of leptospires from 13 different serogroups.
Conclusions:
- Pepsin-enhanced immunofluorescence is a valuable technique for improved leptospire detection in FFPE tissues.
- This method offers enhanced sensitivity and broad applicability for diagnosing leptospirosis in veterinary samples.
- The technique is robust, accommodating long-term tissue storage and multiple serogroups with a single antiserum.