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Am J Physiol Endocrinol Metab (January 31, 2006). doi:10.1152/ajpendo.00390.2005
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Submitted on August 22, 2005
Accepted on January 30, 2006

IN VIVO MEASUREMENT OF SYNTHESIS RATE OF MULTIPLE PLASMA PROTEINS IN HUMANS

Abdul Jaleel1, Vandana Nehra1, Xuan-Mai T Persson1, Yves Boirie1, Maureen Bigelow1, and K. Sreekumaran Nair1*

1 Division of Endocrinology, Mayo Clinic, Rochester, MN, USA

* To whom correspondence should be addressed. E-mail: nair.sree{at}mayo.edu.

Advances in quantitative proteomics have facilitated the measurement of large scale protein quantification, which represents net changes in protein synthesis and breakdown. However, measuring the rate of protein synthesis is the only way to determine the translational rate of gene transcripts. Here we report a technique to measure the rate of incorporation of amino acids from ingested protein labeled with stable isotope into individual plasma proteins. This approach involves 3 steps: (1) production of stable isotope labeled milk whey protein, oral administration of this intrinsically labeled protein, and subsequent collection of blood samples, (2) fractionation of the plasma and separation of the individual plasma proteins by a combination of anion-exchange high pressure liquid chromatography and gel electrophoresis; and (3) identification of individual plasma proteins by tandem mass spectrometry and measurement of stable isotopic enrichment of these proteins by gas chromatography/mass spectrometry. This method allowed the measurement of the fractional synthesis rate (FSR) of 29 different plasma proteins using the same precursor pool. We noted a 30-fold difference in FSR of different plasma proteins with a wide-range of physiological functions. This approach offers tremendous opportunity to study the regulation of plasma proteins in humans in many physiologic and pathologic states.




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