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Stanniocalcin 1 alters muscle and bone structure and function in transgenic mice
Ellen H Filvaroff1, Susan Guillet, Constance Zlot
1Department of Molecular Oncology, Genentech Inc., South San Francisco, California 94080, USA. filvarof@gene.com
Endocrinology
|August 24, 2002
Summary
Transgenic mice expressing stanniocalcin-1 (STC-1) exhibited smaller size, altered bone formation, and reduced muscle mass. STC-1 influences calcium homeostasis, bone structure, muscle, and blood vessel formation.
Area of Science:
- Endocrinology
- Skeletal Biology
- Physiology
Background:
- Fish stanniocalcin (STC) regulates calcium and phosphate metabolism.
- The homologous mammalian protein, STC-1, has an incompletely understood role in vertebrates.
Purpose of the Study:
- To investigate the physiological functions of STC-1 in mammals.
- To characterize the effects of STC-1 expression on bone, muscle, and vascular development.
Main Methods:
- Generation of transgenic mice with muscle-specific STC-1 expression.
- Analysis of skeletal morphology, bone formation and mineralization, muscle function, and vascularization.
- Utilized microcomputed tomography and electron microscopy.
Main Results:
- STC-1 transgenic mice showed reduced body size, decreased bone formation rate, and increased cortical bone thickness.
- Muscle tissues were smaller with enlarged mitochondria, and vascularity was increased.
- Osteoclast activity was suppressed, while cartilage matrix synthesis increased.
Conclusions:
- STC-1 significantly impacts calcium homeostasis, bone mass and structure, muscle physiology, and angiogenesis.
- STC-1 affects osteoblasts, osteoclasts, myoblasts/myocytes, and endothelial cells.
- These findings highlight STC-1's crucial role in mammalian physiology.