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Abstract
High dietary salt intake elevates blood pressure and drives multi-organ damage. However, the molecular programs underlying progressive organ injury remain poorly defined. Here, we present a longitudinal multi-organ transcriptomic atlas of salt-induced hypertensive injury. We profiled kidney cortex, kidney medulla, heart, and liver across four stages spanning early hypertension to advanced pathology in Dahl salt-sensitive rats. We identified dynamic and tissue-specific molecular trajectories, including a shared early proliferative response that converges on proinflammatory and fibrotic remodeling. Notably, we uncovered compartment-specific renal responses, showing that the cortex and medulla, despite their proximity, follow distinct molecular trajectories during disease progression. We further identified 79 stage- and tissue-specific transcription factors that drive gene expression dynamics in salt-induced hypertensive injury. Integration with human genome-wide association studies revealed conserved pathways in endocrine signaling, ion transport, lipid metabolism, and detoxification, establishing cross-species relevance and highlighting mechanistic targets of clinical importance. Compound–transcriptome analysis revealed stage- and organ-specific therapeutic opportunities, prioritizing kinase and epigenetic modulators as candidates to rebalance maladaptive gene programs. Overall, this study provides a resource for understanding molecular mechanisms from early salt-induced hypertension to tissue-specific injury and underscores the need for precision interventions.
Authors
Ratnakar Tiwari, Olha Kravtsova, Lashodya V. Dissanayake, Melissa Lowe, Biyang Xu, Vladislav Levchenko, Steven Didik, Ruslan Bohovyk, Daria V. Ilatovskaya, Oleg Palygin, Alexander Staruschenko
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