NR4A1 (nuclear receptor subfamily 4 group A member 1) is a transcription factor that regulates diverse physiological processes through transcriptional control and protein-protein interactions. As a transcription factor, NR4A1 binds to specific DNA sequences to regulate gene expression, including direct binding to the TrkB promoter to enhance transcription and support cognitive function 1, and activation of Wnt4 transcription to promote mesenchymal stem cell osteogenesis 2. The protein also facilitates Foxp3 expression in regulatory T cells, contributing to immune homeostasis 3. Beyond transcriptional activity, NR4A1 functions through direct protein interactions, including binding to CAP1 to regulate platelet activation via cAMP signaling 4. NR4A1 expression is dynamically regulated across various pathological conditions - it decreases with aging in hippocampal neurons correlating with cognitive decline 1, is upregulated during hypercholesterolemia 4, and is suppressed by TGF-β1 during inflammatory bone disorders 2. Clinically, NR4A1 represents a therapeutic target for multiple conditions including cognitive decline, thrombosis, cancer immunotherapy 5, glomerulonephritis 6, and bone regeneration disorders, with specific agonists and degradation strategies showing therapeutic promise across these diverse applications.