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Letters to the Editor
Open Access

Post-Mortem Diagnostics in COVID-19 AKI, More Often but Timely

Jan G. Zijlstra, Matijs van Meurs and Jill Moser
JASN January 2021, 32 (1) 255; DOI: https://doi.org/10.1681/ASN.2020091263
Jan G. Zijlstra
1Department of Pathology and Medical Biology, Medical Biology Section, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
2Department of Critical Care, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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Matijs van Meurs
1Department of Pathology and Medical Biology, Medical Biology Section, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
2Department of Critical Care, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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Jill Moser
1Department of Pathology and Medical Biology, Medical Biology Section, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
2Department of Critical Care, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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  • AKI
  • COVID-19
  • autopsy
  • kidney biopsy

Coronavirus disease 2019 (COVID-19) is a new and devastating disease with renal involvement that deserves an intense and collaborative research effort. Golmai et al.1 make use of classic autopsy with the modern modification of postmortem, fine-needle kidney biopsy. Autopsy was originally developed to investigate macroscopic, light-microscopic, postmortem, anatomic and histologic changes associated with disease. Standard autopsy is mildly time sensitive, with autolysis developing several hours after death. However, new developments in pathophysiologic diagnostics—protein, RNA, and DNA analyses—require faster sample handling and careful sample storage to prevent postmortem effects. Golmai et al.1 do not describe how long after death biopsies were performed, but state the majority of samples show signs of autolysis. This precludes protein, RNA, and most DNA analyses because we would be observing mostly postmortem effects. Similar to sepsis, COVID-19 microscopic changes in the kidney are limited, with most studies showing some acute tubular necrosis, which cannot fully explain AKI. A large proportion of renal failure in patients with COVID-19 and those with sepsis seems to be attributed to functional defects without major histologic changes. Therefore, modern protein and nucleic-acid techniques might shed some light on the underlying mechanisms driving renal failure. We have shown that kidney biopsies can be performed at the bedside within 1 hour after death, and that gene expression analyses are feasible.2,3 Mortality of patients with COVID-19 was shown to be higher in patients with AKI.4 Yet, the mechanisms driving renal failure in patients with COVID-19 still remain largely unknown. Therefore, we plead for more studies to investigate postmortem renal biopsy specimens taken rapidly after death to enable the use of modern molecular diagnostics, together with classic autopsy, to investigate mechanisms of AKI induced by COVID-19.

Disclosures

All authors have nothing to disclose.

Funding

None.

Footnotes

  • Published online ahead of print. Publication date available at www.jasn.org.

  • See related reply, “Authors' Reply,” on pages 255–256, and original article “Histopathologic and Ultrastructural Findings in Postmortem Kidney Biopsy Material in 12 Patients with AKI and COVID-19,” in Vol. 31, Iss. 9, 1944–1947.

  • Copyright © 2021 by the American Society of Nephrology

References

  1. ↵
    1. Golmai P,
    2. Larsen CP,
    3. DeVita MV,
    4. Wahl SJ,
    5. Weins A,
    6. Rennke HG, et al
    .: Histopathologic and ultrastructural findings in postmortem kidney biopsy material in 12 patients with AKI and COVID-19. J Am Soc Nephrol 31: 1944–1947, 2020pmid:32675304
    OpenUrlFREE Full Text
  2. ↵
    1. Aslan A,
    2. Jongman RM,
    3. Moser J,
    4. Stegeman CA,
    5. van Goor H,
    6. Diepstra A, et al
    .: The renal angiopoietin/Tie2 system in lethal human sepsis. Crit Care 18: 423, 2014pmid:24976393
    OpenUrlPubMed
  3. ↵
    1. Jou-Valencia D,
    2. Koeze J,
    3. Popa ER,
    4. Aslan A,
    5. Zwiers PJ,
    6. Molema G, et al
    .: Heterogenous renal injury biomarker production reveals human sepsis-associated acute kidney injury subtypes. Crit Care Explor 1: e0047, 2019pmid:32166228
    OpenUrlPubMed
  4. ↵
    1. Pei G,
    2. Zhang Z,
    3. Peng J,
    4. Liu L,
    5. Zhang C,
    6. Yu C, et al
    .: Renal involvement and early prognosis in patients with COVID-19 pneumonia. J Am Soc Nephrol 31: 1157–1165, 2020pmid:32345702
    OpenUrlAbstract/FREE Full Text
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Journal of the American Society of Nephrology: 32 (1)
Journal of the American Society of Nephrology
Vol. 32, Issue 1
January 2021
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Post-Mortem Diagnostics in COVID-19 AKI, More Often but Timely
Jan G. Zijlstra, Matijs van Meurs, Jill Moser
JASN Jan 2021, 32 (1) 255; DOI: 10.1681/ASN.2020091263

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Post-Mortem Diagnostics in COVID-19 AKI, More Often but Timely
Jan G. Zijlstra, Matijs van Meurs, Jill Moser
JASN Jan 2021, 32 (1) 255; DOI: 10.1681/ASN.2020091263
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