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Ex vivo confocal microscopy performs real-time assessment of renal biopsy in non-neoplastic diseases

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Abstract

Background

Ex vivo confocal microscopy is a technique for tissue examination, which generates images of fresh samples with an optical resolution comparable to those obtained by conventional pathology. The objective of this study was to evaluate the feasibility of using ex vivo confocal microscopy in fusion mode (reflectance and fluorescence) and the H&E-like digital staining that is obtained for the analysis of non-neoplastic kidney biopsies.

Methods

Twenty-four renal samples acquired from autopsies were scanned in a 4th generation ex vivo confocal microscopy device. The imaging process was completed in an average of three minutes.

Results

Confocal images correlated very well to the corresponding conventional histological sections, both in normal tissue and in chronic lesions (glomerulosclerosis, fibrosis and tubular atrophy). The ex vivo confocal microscopy protocol did not add artifacts to the sample for the ulterior study with light microscopy, nor to the histochemical or immunohistochemical studies.

Conclusion

The ease and speed of grayscale and fluorescence image acquisition, together with the quality of the H&E-like digitally stained images obtained with this approach, suggest that this technique shows promise for use in clinical nephrology and renal transplantation.

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Acknowledgements

CERCA Program / Generalitat de Catalunya

Funding

This work was supported by: “Instituto de Salud Car-los III (ISCII)” and “Fondo Europeo de Desarrollo Regional (FEDER)”(PI17/00080). Role of digital pathology and nuclear magnetic resonance in the early detection of interstitial fibrosis in chronic kidney disease. "Recent development of the technology within a European Union-funded program (DIAGNOPTICS, " Diagnosis of skin cancer using optics ". Grant agreement no: 621066) enabled to produce a multimodal confocal device for the fast evaluation of tissue specimens Ex-vivo”. Premio Fin de Residencia Hospital Clínic Emili Letang 18_ 251226_PFR_2018. Role of ex vivo confocal microscopy in the evaluation of the renal biopsy.

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Authors and Affiliations

Authors

Contributions

AGH, LFQ, and JM designed the study; JM, SP and LFQ obtained funding; JZV, JPA and AGH carried out experiments. AGH, MS, GP, JPA, JZV and LFQ analyzed the data; AGH and MS made the figures; AGH, LFQ, JM, MB, JZV, SP, JPA drafted and revised the paper; all authors approved the final version of the manuscript.

Corresponding author

Correspondence to Luis F. Quintana.

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Conflict of interest

No author has any conflict of interest. The information presented in this paper has not been published previously in whole or in part.

Ethical approval

The study was approved by the ethics committee of the Hospital Clinic, Barcelona and was conducted in accordance with the precepts of the Helsinki Declaration. All the data were handled anonymously.

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Villarreal, J.Z., Pérez-Anker, J., Puig, S. et al. Ex vivo confocal microscopy performs real-time assessment of renal biopsy in non-neoplastic diseases. J Nephrol 34, 689–697 (2021). https://doi.org/10.1007/s40620-020-00844-8

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  • DOI: https://doi.org/10.1007/s40620-020-00844-8

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