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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

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Intrinsic Bone Defects in Cystinotic Mice.

Giulia Battafarano¹, Michela Rossi¹, Laura R Rega²

¹Bone Physiopathology Group, Multifactorial Disease and Complex Phenotype Research Area, Bambino Gesù Children's Hospital, Rome, Italy.

The American Journal of Pathology

|February 23, 2019

Summary

Cystinosis, a rare disease, causes bone loss by impairing bone cells. This study shows cystinosin deficiency directly impacts bone remodeling, independent of kidney issues.

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Area of Science:

Biochemistry
Genetics
Bone Biology

Background:

Cystinosis is a rare lysosomal storage disorder due to CTNS gene mutations.
It leads to cystine accumulation and cellular damage.
Most patients develop Fanconi syndrome, impacting bone health.

Purpose of the Study:

To determine if cystinosin deficiency directly affects bone remodeling.
To investigate the bone phenotype in Ctns-/- knockout mice independent of kidney dysfunction.
To characterize the in vitro effects of cystinosin deficiency on bone cells.

Main Methods:

Utilized micro-computed tomography, histomorphometry, and serum biomarker analysis in Ctns-/- mice.
Evaluated bone phenotype in mice models lacking tubulopathy.
Performed in vitro studies on osteoblasts and osteoclasts from deficient mice.

Main Results:

Ctns-/- mice exhibited reduced trabecular bone volume, bone mineral density, and thickness.
Histomorphometry revealed decreased osteoblast and osteoclast parameters.
Serum markers indicated reduced bone remodeling activity in knockout mice.
In vitro studies confirmed impaired osteoblast and osteoclast function.

Conclusions:

Cystinosin deficiency directly impairs bone cells, leading to bone loss.
The observed bone loss phenotype is independent of renal failure.
This highlights a direct role of cystinosin in maintaining bone health.