Cited by 24COVID-19 Clinical Research StudiesLong-Term Effects of COVID-19SARS-CoV-2 and COVID-19 Research

COVID-19 Pathology in the Lung, Kidney, Heart and Brain: The Different Roles of T-Cells, Macrophages, and Microthrombosis

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Poloni, Tino Emanuele, Moretti, Matteo, Medici, Valentina, Turturici, Elvira, Belli, Giacomo, Cavriani, Elena, Visonà, Silvia Damiana, Rossi, Michele +7 more·2022·Cells

Abstract

Here, we aim to describe COVID-19 pathology across different tissues to clarify the disease’s pathophysiology. Lungs, kidneys, hearts, and brains from nine COVID-19 autopsies were compared by using antibodies against SARS-CoV-2, macrophages-microglia, T-lymphocytes, B-lymphocytes, and activated platelets. Alzheimer’s Disease pathology was also assessed. PCR techniques were used to verify the presence of viral RNA. COVID-19 cases had a short clinical course (0–32 days) and their mean age was 77.4 y/o. Hypoxic changes and inflammatory infiltrates were present across all tissues. The lymphocytic component in the lungs and kidneys was predominant over that of other tissues (p < 0.001), with a significantly greater presence of T-lymphocytes in the lungs (p = 0.020), which showed the greatest presence of viral antigens. The heart showed scant SARS-CoV-2 traces in the endothelium–endocardium, foci of activated macrophages, and rare lymphocytes. The brain showed scarce SARS-CoV-2 traces, prominent microglial activation, and rare lymphocytes. The pons exhibited the highest microglial activation (p = 0.017). Microthrombosis was significantly higher in COVID-19 lungs (p = 0.023) compared with controls. The most characteristic pathological features of COVID-19 were an abundance of T-lymphocytes and microthrombosis in the lung and relevant microglial hyperactivation in the brainstem. This study suggests that the long-term sequelae of COVID-19 derive from persistent inflammation, rather than persistent viral replication.

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  • The SARS-CoV-2 genome has been detected by PCR in cardiac tissues from autopsies of patients with COVID-19, suggesting the virus can infect the heart.

    “The SARS-CoV-2 genome has been detected by polymerase chain reaction (PCR) in cardiac tissues from autopsies of patients with COVID-19, 20,21 suggesting the virus can infect the heart.”

    From COVID-19, Myocarditis and Pericarditis (2023) · cites this paper as [21]

    The Results (p. 9) report SARS-CoV-2 traces in heart tissue from one autopsy case, and the Discussion (p. 16) says the virus probably penetrates the heart. But the Methods (p. 4) describe PCR testing of brain tissue, not cardiac tissue; this paper does not establish the claimed PCR detection in the heart and says it found no evidence of viral replication there. (LLM, conf=0.87)

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Authors
Poloni, T. E., Moretti, M., Medici, V., Turturici, E., Belli, G., Cavriani, E., Visonà, S. D., Rossi, M., Fantini, V., Ferrari, R. R., Carlos, A. F., Gagliardi, S., Tronconi, L., Guaita, A., & Ceroni, M.
Affiliations
  • Fondazione Golgi Cenci (IT)
  • University of Pavia (IT)
  • Department of Public Health, Experimental and Forensic Medicine, University of Pavia, 27100 Pavia, Italy
  • Unit of Molecular Biology and Transcriptomics IRCCS Mondino Foundation, 27100 Pavia, Italy
Corresponding author
Poloni, Tino Emanuele
Venue
Cells
Publisher
MDPI AG
Published
2022-10-04
Volume
11
Issue
19
Pages
3124
ISSN
2073-4409 (ISSN-L)
OpenAlex
W4303628086
Cited by
24
References
92
Citations by year
2026: 3 · 2025: 6 · 2024: 7 · 2023: 8
FWCI
2.56
Type
journal article
Language
en
Open access
Locations
  • Cells (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Fondo di Beneficenza Intesa Sanpaolo (Italy) (B/2020/0045)
Topics
  • Health Sciences › Medicine › Infectious Diseases › COVID-19 Clinical Research Studies
  • Health Sciences › Medicine › Neurology › Long-Term Effects of COVID-19
  • Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
Keywords
SARS-CoV-2, T cells, macrophages, microglial activation, microvascular thrombosis, lung, kidney, heart, brain, Alzheimer's disease pathology, chronic inflammation, hypoxia, lymphocyte infiltration, autopsy findings, long-term sequelae
MeSH terms
COVID-19, SARS-CoV-2, Aged, Antigens, Viral, Brain, Humans, Kidney, Lung, Macrophages, RNA, Viral, T-Lymphocytes, Thrombosis

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