LG 101506: High-Purity RXR Modulator for Advanced Nuclear Receptor Research

Executive Summary: LG 101506 is a synthetic Retinoid X Receptor (RXR) modulator from APExBIO, provided with ≥98% purity for research use (APExBIO). It acts on RXR, a nuclear receptor crucial for regulating gene expression, cell differentiation, and apoptosis (Zhang et al., 2022). The compound is highly stable when stored at -20°C and shows specific solubility profiles in DMSO and ethanol. LG 101506 is pivotal in studies of RXR-related cancer biology and metabolic diseases due to its robust and selective mechanism of action. Its use advances understanding of retinoid signaling and nuclear receptor modulation in disease models.

Biological Rationale

The Retinoid X Receptor (RXR) is a member of the nuclear receptor superfamily, acting as a ligand-activated transcription factor. RXR heterodimerizes with other nuclear receptors, such as RAR, PPAR, and LXR, regulating expression of genes involved in cell growth, differentiation, and metabolic homeostasis (DOI:10.1038/s41418-022-01012-0). Dysregulation of RXR signaling is implicated in cancer, metabolic disorders, and immune response. RXR modulation affects critical processes like apoptosis and immune checkpoint regulation, making it a valuable target for translational research. LG 101506, as a synthetic RXR modulator, enables precise interrogation of these pathways in cellular and in vivo contexts.

Mechanism of Action of LG 101506 (RXR modulator)

LG 101506, with chemical name (2E,4E,6Z)-7-(3,5-di-tert-butyl-2-(2,2-difluoroethoxy)phenyl)-3-methylocta-2,4,6-trienoic acid, binds to the ligand-binding domain of RXR. This binding induces conformational changes in RXR, altering its interaction with co-activators or co-repressors and modulating transcriptional activity. By influencing RXR heterodimerization, LG 101506 can potentiate or inhibit the activity of RXR partner receptors, impacting downstream gene expression related to cell proliferation, differentiation, and apoptosis (Strategic RXR Modulation: Advancing Nuclear Receptor Biol...). LG 101506's effect on RXR also affects nuclear receptor crosstalk, influencing metabolic and immune gene programs relevant to cancer and metabolic diseases.

Evidence & Benchmarks

• LG 101506 modulates RXR-mediated transcription in cell-based assays, altering expression of target genes involved in proliferation and apoptosis (Zhang et al., 2022).
• RXR modulation by LG 101506 is associated with changes in PD-L1 expression, relevant for immune checkpoint research in triple-negative breast cancer (Zhang et al., 2022).
• The compound is supplied at ≥98% purity and demonstrates off-white solid appearance; solubility in DMSO is <42.05 mg/ml and in ethanol <21.03 mg/ml (APExBIO).
• LG 101506 is stable at -20°C for long-term storage; solutions are not recommended for prolonged storage and should be used promptly (APExBIO).
• Use of LG 101506 in disease models clarifies RXR's role in gene expression regulation and immuno-metabolic pathways (RXR Modulation Redefined: Mechanistic Insights and Strate...).

Applications, Limits & Misconceptions

LG 101506 is widely used in research on RXR signaling pathway modulation, nuclear receptor biology, and disease models involving gene regulation, metabolism, and immune checkpoints. It enables mechanistic studies of RXR function in cancer and metabolic disorders, especially where RXR heterodimerization or crosstalk with other receptors is pivotal. The compound is effective in cell-based and in vivo assays for investigating gene expression, cell differentiation, and proliferation.

• LG 101506: Advanced RXR Modulator for Immune Checkpoint a... – This article focuses on immune checkpoint dynamics; the current article provides additional detail on PD-L1 regulation and experimental workflow.
• LG 101506 and the Strategic Modulation of RXR: Charting a... – Earlier work covered translational insights; here, we elaborate on product specifications and methodological integration.
• LG 101506: RXR Modulator Unlocking New Frontiers in Immun... – While that article describes immuno-metabolic applications, this article clarifies compound limits and storage parameters.

Common Pitfalls or Misconceptions

• LG 101506 is not intended for diagnostic or therapeutic use in humans; it is for research use only (APExBIO).
• Solutions of LG 101506 should not be stored long-term; degradation may affect experimental reproducibility.
• It does not directly inhibit or activate immune checkpoints; effects are mediated via RXR-dependent gene regulation.
• The compound's efficacy may vary between cell types and models due to differential RXR expression or context.
• Overinterpretation of in vitro results without validation in disease-relevant models is discouraged.

Workflow Integration & Parameters

LG 101506 (SKU: B7414) is supplied as an off-white solid, with recommended storage at -20°C for maximum stability. For experimental use, dissolution in DMSO (<42.05 mg/ml) or ethanol (<21.03 mg/ml) is advised; solutions should be freshly prepared. Typical applications include cell differentiation assays, gene expression analysis, and apoptosis research. Concentration and exposure time should be optimized for each model system. APExBIO provides spectral and analytical data for batch verification (APExBIO).

Conclusion & Outlook

LG 101506 stands as a highly pure, well-characterized RXR modulator supporting rigorous nuclear receptor research. Its utility spans fundamental studies of RXR signaling, disease modeling, and exploration of gene regulatory mechanisms relevant to cancer and metabolic disorders (Zhang et al., 2022). Ongoing advances in immunotherapy and metabolic research underscore the importance of precise RXR modulation tools. LG 101506, available from APExBIO, remains integral for translational research into nuclear receptor-related disease pathways.