How Rabies Virus Triggers Fatal Brain Immune Failure and Neuronal Pyroptosis
- Rabies virus infection triggers fatal brain immune failure through a distinct mechanism involving neuronal pyroptosis and widespread chemokine upregulation, according to findings detailed in recent scientific literature.
- To validate these profiles, researchers measured mRNA expression levels of seven specific chemokine genes—including Ccl2, Ccl3, Ccl4, Ccl5, Ccl7, Ccl12, and Cxcl10—in the brains of mice infected with...
- Enzyme-linked immunosorbent assay testing confirmed that protein expression levels mirrored the mRNA trends, showing elevated concentrations in murine brain samples at four and seven days post-infection.
Rabies virus infection triggers fatal brain immune failure through a distinct mechanism involving neuronal pyroptosis and widespread chemokine upregulation, according to findings detailed in recent scientific literature. The study outlines how the virus drives inflammatory cell death within the central nervous system.
Cellular Changes and Transcriptome Profiles
To validate these profiles, researchers measured mRNA expression levels of seven specific chemokine genes—including Ccl2, Ccl3, Ccl4, Ccl5, Ccl7, Ccl12, and Cxcl10—in the brains of mice infected with the rRC-HL, GX074, and CVS-24 strains. The data demonstrated that mRNA expression for all seven genes increased noticeably at four and seven days post-infection across the tested strains. However, mice infected with the GX074 strain showed slightly lower mRNA levels for four of these genes at four days post-infection compared to seven days, followed by a rapid increase at the later time point. Furthermore, the CVS-24-infected group displayed significantly higher mRNA expression levels for nine chemokine genes than both the rRC-HL and GX074 groups at both time points.
Protein Levels and the Pyroptosis Pathway
Enzyme-linked immunosorbent assay testing confirmed that protein expression levels mirrored the mRNA trends, showing elevated concentrations in murine brain samples at four and seven days post-infection. Transcriptome profiling also identified upregulated genes associated with the pyroptosis pathway, such as Gsdmd, Nlrp3, Casp-1, and IL-1β. At four days post-infection, expression levels of Gsdmd, Nlrp3, Casp-1, and IL-1β were upregulated in mice infected with rRC-HL by 4.45-, 1.97-, 5.45-, and 5.40-fold, respectively. In CVS-24-infected mice, those same genes increased by 11.31-, 3.7-, 10.27-, and 29.83-fold. By contrast, expression levels remained relatively low in mice infected with the GX074 strain at the four-day mark, showing increases of only 0.80-, 0.79-, 0.84-, and 1.06-fold. By seven days post-infection, significant upregulation occurred across all three strains.
