Journal
IMMUNOLOGY AND CELL BIOLOGY
Volume 93, Issue 5, Pages 442-451Publisher
WILEY
DOI: 10.1038/icb.2014.121
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Funding
- National Health and Medical Research Council (NHMRC) of Australia [1006428]
- Anhui Normal University of China [004061439]
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A protease inhibitor, cystatin C (Cst C), is a secreted cysteine protease inhibitor abundantly expressed in body fluids. Clinically, it is mostly used to measure glomerular filtration rate as a marker for kidney function due to its relatively small molecular weight and easy detection. However, recent findings suggest that Cst C is regulated at both transcriptional and post-translational levels, and Cst C production from haematopoietic cell lineages contributes significantly to the systematic pools of Cst C. Furthermore, Cst C is directly linked to many pathologic processes through various mechanisms. Thus fluctuation of Cst C levels might have serious clinical implications rather than a mere reflection of kidney functions. Here, we summarize the pathophysiological roles of Cst C dependent and independent on its inhibition of proteases, outline its change of expression by various stimuli, and elucidate the regulatory mechanisms to control this disease-related protease inhibitor. Finally, we discuss the clinical implications of these findings for translational gains.
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