Small integrin-binding ligand N-linked glycoprotein (SIBLING) (SIBLING)

The Small Integrin-Binding Ligand N-linked Glycoprotein (SIBLING) family, which includes dentin matrix protein 1 (DMP1), bone sialoprotein (BSP), and osteopontin (OPN), consists of acidic phosphoproteins essential for the regulation of mineralized tissue formation (Fisher & Fedarko, 2003). These proteins are characterized by a specific RGD (Arg-Gly-Asp) motif that facilitates binding to integrin receptors, thereby mediating cell adhesion, migration, and survival signaling (Bellahcène et al., 2008). While primarily known for their roles in bone and tooth biomineralization, SIBLINGs are frequently upregulated in various pathologies, including cancer, where they promote tumor metastasis and angiogenesis (Rangaswami et al., 2006). Osteopontin, in particular, acts as a potent cytokine in inflammatory diseases and is a key player in cardiovascular calcification (Weber, 2011). Therapeutic targeting of this family often focuses on neutralizing antibodies or small molecules that disrupt the interaction between these proteins and their receptors, such as integrins or CD44, to treat bone disorders and metastatic cancers (Jain et al., 2009).

Other names

SIBLING familySmall integrin-binding ligand N-linked glycoproteinsDMP1IBSPSPP1DSPPMEPEDentin matrix protein 1Bone sialoproteinOsteopontinDentin sialophosphoproteinMatrix extracellular phosphoglycoprotein

Neutralization of osteopontin to inhibit integrin-mediated signaling; Blockade of the RGD motif to prevent cell adhesion and migration; Modulation of hydroxyapatite crystallization in mineralized tissues