Laminin subunit beta-2

Laminin subunit beta-2 (LAMB2) is a structural glycoprotein component of the extracellular matrix that mediates cell attachment, migration, and tissue organization through interaction with cell surface receptors and other matrix proteins (UniProt: P55268). It is particularly abundant during embryonic development and plays critical roles in maintaining tissue architecture and basement membrane integrity across multiple organ systems.

LAMB2 mutations cause rare monogenic disorders including Pierson syndrome (PIERS, MIM 609049), a severe autosomal recessive condition presenting with neonatal nephrotic syndrome, mesangial sclerosis, and ocular abnormalities, and Nephrotic syndrome 5 (NPHS5, MIM 614199), characterized by early-onset progressive renal failure and occasional ocular anomalies (UniProt: P55268). These genetic associations highlight the protein's essential role in glomerular basement membrane function.

In the context of Alzheimer's disease, LAMB2 is upregulated in post-mortem AD brain tissue compared to age-matched controls (Chaparral AD proteomics), with a mean log2 fold-change of 0.82 across analyzed subcellular fractions. This elevation may reflect alterations in extracellular matrix composition or neuroinflammatory responses characteristic of AD pathology, though the functional significance requires further investigation.