DLL4 and obesity due to melanocortin 4 receptor deficiency: Obesity inhibited miR-30 expression in adipose tissue macrophages (ATMs), and miR-30 was shown to target Delta-like-4 (DLL4), a Notch1 ligand is associated with ATM inflammation.255 miR-30 inhibition triggers Notch1 signaling, pro-inflammatory cytokine (TNFα and CCL2) production, and M1 macrophage polarization, indicating that miR-30 manipulation could be a therapeutic approach for reducing obesity-induced inflammation.