Mediator complex subunit 28 (MED28) (MED28)

Mediator complex subunit 28 (MED28), also known as Endothelial-derived gene 1 (EG-1) or Magicin, is a multifunctional protein that plays a critical role in cellular proliferation, signal transduction, and transcriptional regulation [11]. Originally identified as a gene upregulated in endothelial cells exposed to tumor-conditioned media, MED28 is significantly overexpressed in the epithelial cells of various cancers, including colorectal, breast, and prostate cancers [2, 4]. It acts as a scaffold or adaptor protein, interacting with the Src family of tyrosine kinases and the Mediator complex to relay signals that activate the MAPK pathway, thereby promoting tumor growth and angiogenesis [5, 11]. Due to its elevated expression in malignant tissues and its role in driving oncogenic signaling, MED28 has emerged as a promising therapeutic target [7, 8]. Experimental strategies, including monoclonal antibodies like B303 and siRNA-mediated knockdown, have demonstrated the potential to inhibit tumor proliferation and reduce xenograft size in preclinical models [7, 9]. The presence of soluble MED28 in the serum and urine of cancer patients also suggests its potential utility as a non-invasive biomarker for disease progression and treatment efficacy [7].

Other names

Endothelial-derived gene 1EG-1MagicinMerlin and Grb2 interacting cytoskeletal proteinEG1fksg1

Inhibition of MED28/EG-1 protein activity or expression to block downstream Src and MAPK (ERK1/2, JNK, p38) signaling pathways, thereby suppressing tumor cell proliferation, migration, and angiogenesis.