LECT2-Mediated ER Stress and EGFR Signaling: Unraveling the Hepatorenal Cross-Talk in Renal Fibrosis

Literature Information

This article deciphers cutting-edge research investigating how liver-secreted leukocyte cell-derived chemotaxin-2 (LECT2) modulates renal fibrosis via the dual regulation of endoplasmic reticulum (ER) stress and epidermal growth factor receptor (EGFR) signaling pathways. The research uncovers the critical inter-organ regulatory role of LECT2 in renal fibrogenesis and identifies its underlying molecular mechanisms, with high-purity recombinant human LECT2 protein—a core research tool for this study—provided by ANT BIO PTE. LTD.. This research not only deepens the understanding of hepatorenal communication in chronic kidney disease but also lays a theoretical foundation for developing novel anti-fibrotic therapeutic strategies, with ANT BIO’s high-performance biological reagents empowering every step of the mechanistic exploration and validation.

Research Background

Renal fibrosis stands as a universal pathological hallmark of all chronic kidney diseases (CKD) progressing to end-stage renal disease (ESRD), representing the ultimate common pathway of renal parenchymal damage and functional decline. Its pathogenic mechanisms are highly complex, centered on persistent inflammatory responses, excessive activation of myofibroblasts, and aberrant deposition of extracellular matrix (ECM) that ultimately leads to irreversible renal structural remodeling and loss of renal function.

In recent years, emerging evidence has highlighted the pivotal role of liver-derived secretory factors in inter-organ communication, acting as key mediators that remotely regulate pathological processes in distant tissues and organs. LECT2, a cytokine predominantly secreted by hepatocytes, has been found to exhibit altered expression patterns during renal fibrogenesis, implying its potential involvement in the dynamic modulation of the renal microenvironment. However, the specific molecular mechanisms by which LECT2 regulates renal fibrosis progression, and its cross-talk with classic stress and survival signaling pathways, remained largely elusive prior to this research. Addressing these gaps is critical for identifying new therapeutic targets for renal fibrosis and advancing the treatment of chronic kidney diseases.

Research Rationale

The Putative Role of LECT2 in Renal Fibrosis: A Starting Point for Mechanistic Exploration

The research first focused on clarifying the functional role of LECT2 in renal fibrosis through in vivo loss-of-function experiments. In normal renal tissue, LECT2 is predominantly localized in the renal tubulointerstitial area, while its expression expands along vascular structures during fibrotic progression—an anatomical distribution change that hints at its functional relevance to renal microenvironmental regulation. To validate this hypothesis, the research utilized Lect2 knockout mouse models with unilateral ureteral obstruction (UUO), a classic animal model of renal fibrosis, to assess the phenotypic changes induced by LECT2 deficiency.

Deciphering the Signaling Network: ER Stress and EGFR/PI3K/AKT as the Core Regulators

Subsequent in-depth mechanistic studies were designed to explore the downstream signaling pathways mediating LECT2’s pro-fibrotic effects, with a specific focus on the interaction between ER stress and EGFR signaling—two pathways closely associated with cellular stress response, survival and fibrogenesis. The research hypothesized that LECT2 exerts its regulatory effects on renal fibrosis not through direct action on fibroblasts, but by modulating the biological behavior of renal endothelial cells via these two interconnected signaling networks, thereby indirectly driving myofibroblast activation and ECM deposition. Key experimental approaches included immunoprecipitation to verify protein-protein interactions, pathway activation detection via phosphorylation analysis, and phenotypic validation using cell-specific functional assays, all of which relied on high-purity recombinant LECT2 protein to conduct gain-of-function and rescue experiments.

Research Outcomes

This research systematically elucidated the functional role of liver-secreted LECT2 in renal fibrosis and its underlying molecular mechanisms, yielding a series of groundbreaking findings that fill the gap in understanding hepatorenal cross-talk in fibrogenesis:

1. LECT2 is a key pro-fibrotic factor in renal fibrosis: LECT2 deficiency in UUO mouse models significantly alleviates renal fibrotic phenotypes, including reduced renal tubular dilation, a 40% decrease in collagen deposition, and marked downregulation of core myofibroblast activation markers (α-SMA, type I collagen). This confirms that LECT2 is an endogenous promoter of renal fibrosis progression.
2. LECT2 exerts dual regulatory effects on ER stress responses: LECT2 knockout mice exhibit a higher baseline expression of the pro-apoptotic transcription factor CHOP, which is further upregulated upon ER stress induction. In contrast, wild-type fibrotic kidneys show CHOP upregulation accompanied by depletion of the molecular chaperone GRP78, indicating sustained ER stress. LECT2 deficiency enhances early adaptive ER stress responses in endothelial cells, conferring a "preconditioning" protective effect against subsequent damage and thus mitigating fibrosis. These results demonstrate that LECT2 suppresses the early adaptive phase of ER stress, tipping the balance toward sustained pathological stress.
3. LECT2 directly binds to EGFR and activates the PI3K/AKT survival signaling pathway: Immunoprecipitation experiments confirmed the direct physical interaction between LECT2 and EGFR. Overexpression of LECT2 in endothelial cells significantly enhances the phosphorylation of EGFR and its downstream PI3K/AKT pathway, both under ER stress induction (tunicamycin) and pro-fibrotic stimulation (TGF-β1). This signaling activation inhibits caspase-dependent apoptotic cascades, reduces early endothelial cell apoptosis, and promotes the sustained secretion of pro-fibrotic factors such as VEGFA.
4. LECT2 mediates renal fibrosis via an endothelial cell-dependent mechanism: The pro-fibrotic effect of LECT2 is indirect: by maintaining endothelial cell survival under stress conditions and activating their pro-fibrotic secretory phenotype, LECT2 drives subsequent myofibroblast activation and ECM deposition, ultimately exacerbating renal structural remodeling. This uncovers a novel endothelial cell-centered regulatory axis in renal fibrosis.
5. LECT2 represents a critical signaling hub for the "survival-fibrosis" paradox: LECT2 balances cellular survival and tissue fibrogenesis by suppressing adaptive ER stress and activating EGFR/PI3K/AKT survival signaling—this paradox highlights the cell-type-specific and context-dependent nature of signaling pathway outcomes in pathological processes, and underscores the complexity of inter-organ communication in fibrotic diseases.

Product Empowerment: The Indispensable Role of ANT BIO’s Recombinant Human LECT2 Protein in This Research

High-purity, high-bioactivity recombinant human LECT2 protein is a core tool reagent that underpins the entire research process of dissecting LECT2’s function and molecular mechanisms in renal fibrosis. ANT BIO PTE. LTD.’s Human LECT2 Protein (His tag) serves as a critical research asset in multiple key experimental stages, enabling the rigorous validation of hypotheses and the in-depth exploration of mechanisms:

1. Gain-of-function and rescue experiments: Exogenous addition of ANT BIO’s recombinant LECT2 protein at gradient concentrations in in vitro cell culture systems precisely mimics the paracrine/endocrine effects of endogenous LECT2 in vivo, allowing the research team to verify whether the fibrotic phenotypes observed in Lect2 knockout models can be reversed by exogenous LECT2, and to establish a clear dose-response relationship for LECT2’s pro-fibrotic effects.
2. Signaling pathway mapping and validation: Treating renal endothelial cells and other target cell types with ANT BIO’s LECT2 protein, in combination with specific pathway inhibitors (EGFR/PI3K/AKT inhibitors), enabled the systematic dissection of LECT2’s downstream signaling network, clarifying the necessity and sufficiency of EGFR/PI3K/AKT activation in mediating LECT2’s pro-fibrotic effects, and verifying the cross-talk between LECT2 signaling and ER stress responses.
3. Protein-protein interaction verification: The high-purity LECT2 protein from ANT BIO provided the essential material basis for immunoprecipitation experiments that confirmed the direct binding between LECT2 and EGFR, a key finding that laid the foundation for elucidating the upstream molecular event of LECT2’s signaling regulation.
4. Mechanistic validation of cell-type-specific effects: ANT BIO’s LECT2 protein was used to conduct cell-type-specific functional assays, enabling the research team to confirm that LECT2 exerts its pro-fibrotic effects by modulating endothelial cell biology (rather than direct action on fibroblasts), and to validate the regulatory role of LECT2 in endothelial cell apoptosis and pro-fibrotic factor secretion.
5. Foundation for translational research exploration: The high-quality LECT2 protein from ANT BIO also provides a reliable tool for subsequent in vivo intervention studies in animal models, laying the groundwork for exploring LECT2 as a potential therapeutic target for anti-fibrotic drug development.

ANT BIO PTE. LTD.’s Human LECT2 Protein (His tag) is recombinantly expressed in mammalian HEK293 cells, ensuring native protein conformation, proper post-translational modification (including glycosylation) and the formation of bioactive homomeric hexamers. With a purity of over 95% (SDS-PAGE) and endotoxin levels <1.0 EU/μg, this product exhibits excellent batch-to-batch consistency and physicochemical stability, making it the ideal research tool for exploring LECT2’s functions in fibrosis, inflammation, angiogenesis and inter-organ communication.

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All products are independently developed and produced by ANT BIO PTE. LTD., providing high-performance research tools for the exploration of LECT2’s biological functions, hepatorenal cross-talk and fibrotic disease mechanisms:

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