Weakening the nuclear envelope: Lamin B receptor in melanoma metastasis.

Nuclear envelope fragility has been identified as a hallmark of the metastatic process. Indeed, cancer cells undertake a challenging journey through diverse environments during metastasis, notably squeezing through narrow spaces and dense collagen matrices. In their report, Baird et al. identify a key player in nuclear fragility in confined cancer cell migration: the Lamin B receptor. Its overexpression and clustering in specific regions of the nuclear envelope increase nuclear distortion and fragility, rendering nuclei more susceptible to rupture with consequent chromatin extrusion and genomic instability. Elucidating the mechanisms underlying this process, particularly the receptor's sterol reductase activity, represents a promising step towards the identification of novel therapeutic targets.