Metrnl Knockout NRK-52E Cell Line

The Metrnl Knockout NRK-52E Cell Line is a CRISPR/Cas9-edited knockout cell line derived from the NRK-52E rat renal epithelial cell line, in which the Metrnl gene has been disrupted to create a loss-of-function model. This engineered cell line enables targeted investigation of Metrnl??s role in metabolic signaling, energy homeostasis, and immune regulation within a renal proximal tubular epithelial context. By abrogating Metrnl expression, researchers can dissect its contributions to downstream pathways and assess functional consequences in vitro.

NRK-52E cells are an immortalized normal rat kidney epithelial cell line originally derived from Sprague-Dawley rats. These cells exhibit characteristics of proximal tubular epithelium and are widely employed as a model for renal physiology, toxicology, and metabolic studies. Their epithelial morphology and retention of key transport and signaling functions make them particularly suitable for examining kidney-specific metabolic regulation and cross-talk with systemic energy metabolism.

Metrnl (Meteorin-like) encodes a secreted cytokine-like protein that integrates signals from upstream regulators including PPAR?? and the transcriptional coactivator PGC-1??, which are induced by physiological stimuli such as exercise and cold exposure. Metrnl signals through AMPK and STAT3 phosphorylation, leading to upregulation of thermogenic gene expression, notably UCP1, and activation of PPAR??. Additionally, Metrnl promotes M2 macrophage polarization, linking it to anti-inflammatory responses. The receptor mediating Metrnl??s effects has not been identified, but downstream targets STAT3, UCP1, AMPK, and PPAR?? are established pathway components.

In the context of the proximal tubule, Metrnl knockout provides a unique system to study renal energy metabolism and its connection to systemic metabolic disorders. Proximal tubular cells are metabolically active and play a role in gluconeogenesis, lipid metabolism, and cytokine secretion. Disruption of Metrnl in this lineage allows for the assessment of local AMPK-STAT3 axis function, alterations in metabolic gene expression, and the impact on paracrine signaling that may influence interstitial macrophage polarization. This model is especially relevant for exploring kidney-specific contributions to obesity, insulin resistance, and type 2 diabetes.

This cell line is suitable for a range of experimental applications, including metabolic regulation studies using Seahorse metabolic flux analysis, gene expression profiling via RT-qPCR, and protein-level detection through western blotting and immunofluorescence. Phosphorylation-specific assays for AMPK and STAT3 can be employed to map signaling alterations. It also serves as a tool for exercise physiology research and obesity-related kidney pathophysiology. For further information or technical support, please contact Ascent Research.