{Reference Type}: Journal Article
{Title}: Spatial control of perilacunar canalicular remodeling during lactation.
{Author}: Sieverts M;Yee C;Nemani M;Parkinson DY;Alliston T;Acevedo C;
{Journal}: Sci Rep
{Volume}: 14
{Issue}: 1
{Year}: 2024 06 25
{Factor}: 4.996
{DOI}: 10.1038/s41598-024-63645-0
{Abstract}: Osteocytes locally remodel their surrounding tissue through perilacunar canalicular remodeling (PLR). During lactation, osteocytes remove minerals to satisfy the metabolic demand, resulting in increased lacunar volume, quantifiable with synchrotron X-ray radiation micro-tomography (SRµCT). Although the effects of lactation on PLR are well-studied, it remains unclear whether PLR occurs uniformly throughout the bone and what mechanisms prevent PLR from undermining bone quality. We used SRµCT imaging to conduct an in-depth spatial analysis of the impact of lactation and osteocyte-intrinsic MMP13 deletion on PLR in murine bone. We found larger lacunae undergoing PLR are located near canals in the mid-cortex or endosteum. We show lactation-induced hypomineralization occurs 14 µm away from lacunar edges, past a hypermineralized barrier. Our findings reveal that osteocyte-intrinsic MMP13 is crucial for lactation-induced PLR near lacunae in the mid-cortex but not for whole-bone resorption. This research highlights the spatial control of PLR on mineral distribution during lactation.