|Detection of Pref‑1/DLK1/FA1 in 3T3‑L1 Mouse Cell Line by Flow Cytometry. 3T3‑L1 mouse embryonic fibroblast adipose-like cell line was stained with Rabbit Anti-Mouse Pref‑1/DLK1/FA1 PE‑conjugated Monoclonal Antibody (Catalog # FAB8634P, filled histogram) or isotype control antibody (Catalog # IC105P, open histogram). View our protocol for Staining Membrane-associated Proteins.|
Pref-1 (Preadipocyte factor 1), also known as Protein delta homolog 1, DLK1, FA1 and Fetal antigen 1, is a 45-60 kDa transmembrane glycoprotein that is highly expressed in fetal liver, placenta, adult adrenal gland, brain, testis and ovary. Expression of Pref-1 is elevated in liver after birth but starts to decline around postnatal day 16. Mature mouse Pref-1 is a 362 amino acid (aa) type I transmembrane N- and O-linked glycoprotein. It contains a 282 aa extracellular region (aa 24-305), a 24 aa transmembrane segment (aa 306-329), and a 56 aa cytoplasmic domain (aa 330-385). It contains 6 EGF-like domains and is involved in embryonic skeletal system development. Pref-1 inhibits preadipocyte proliferation by regulating their entry into G1/S-phase and represses preadipocyte differentiation. It is a master regulator of preadipocyte homeostasis and adipose tissue expansion. Pref-1 manipulation may, therefore, be utilized in obesity treatments. Mouse Pref-1 shares 85% and 94% aa identity with human and rat Pref-1, respectively.