Morphological Aspects and Viremia Analysis of BALB/c Murine Model Experimentally Infected with Dengue Virus Serotype 4.

Publisher: MDPI Country of Publication: Switzerland NLM ID: 101509722 Publication Model: Electronic Cited Medium: Internet ISSN: 1999-4915 (Electronic) Linking ISSN: 19994915 NLM ISO Abbreviation: Viruses Subsets: MEDLINE

Original Publication: Basel, Switzerland : MDPI

Serogroup* ; Viral Tropism*; Dengue Virus/*genetics ; Dengue Virus/*pathogenicity ; Viral Proteins/*genetics; Animals ; Dengue/virology ; Dengue Virus/classification ; Disease Models, Animal ; Heart/virology ; Humans ; Liver ; Lung/virology ; Male ; Mice ; Mice, Inbred BALB C ; Viremia

Ever since its brief introduction in the Brazilian territory in 1981, dengue virus serotype 4 (DENV-4) remained absent from the national epidemiological scenario for almost 25 years. The emergence of DENV-4 in 2010 resulted in epidemics in most Brazilian states. DENV-4, however, remains one of the least studied among the four DENV serotypes. Despite being known as a mild serotype, DENV-4 is associated with severe cases and deaths and deserves to be investigated; however, the lack of suitable experimental animal models is a limiting factor for pathogenesis studies. Here, we aimed to investigate the susceptibility and potential tropism of DENV-4 for liver, lung and heart of an immunocompetent mice model, and to evaluate and investigate the resulting morphological and ultrastructural alterations upon viral infection. BALB/c mice were inoculated intravenously with non-neuroadapted doses of DENV-4 isolated from a human case. The histopathological analysis of liver revealed typical alterations of DENV, such as microsteatosis, edema and vascular congestion, while in lung, widespread areas of hemorrhage and interstitial pneumonia were observed. While milder alterations were present in heart, characterized by limited hemorrhage and discrete presence of inflammatory infiltrate, the disorganization of the structure of the intercalated disc is of particular interest. DENV-4 RNA was detected in liver, lung, heart and serum of BALB/c mice through qRT-PCR, while the NS3 viral protein was observed in all of the aforementioned organs through immunohistochemistry. These findings indicate the susceptibility of the model to the serotype and further reinforce the usefulness of BALB/c mice in studying the many alterations caused by DENV.

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Keywords: BALB/c mice; DENV-4; heart; histopathology; liver; lung; ultrastructure

0 (Viral Proteins)

Date Created: 20211026 Date Completed: 20220210 Latest Revision: 20220210

20250114

PMC8538460

10.3390/v13101954

34696384