S-Adenosylmethionine (SAM) serves as a methyl donor in biological transmethylation reactions. S-Adenosylhomocysteine (SAH) is the product as well as the inhibitor of transmethylations and the ratio SAM/SAH is regarded as the measure of methylating capacity ("methylation index"). We present a rapid and sensitive LC-MS/MS method for SAM and SAH determination in mice tissues. The method is based on chromatographic separation on a Hypercarb column (30 mm x 2.1 mm, 3 microm particle size) filled with porous graphitic carbon stationary phase. Sufficient retention of SAM and SAH on the chromatographic packing allows simple sample preparation protocol avoiding solid phase extraction step. No significant matrix effects were observed by analysing the tissue extracts on LC-MS/MS. The intra-assay precision was less than 9%, the inter-assay precision was less than 13% and the accuracy was in the range 98-105% for both compounds. Stability of both metabolites during sample preparation and storage of tissue samples was studied: the SAM/SAH ratio in liver samples dropped by 34% and 48% after incubation of the tissues at 4 degrees C for 5 min and at 25 degrees C for 2 min, respectively. Storage of liver tissues at -80 degrees C for 2 months resulted in decrease of SAM/SAH ratio by 40%. These results demonstrate that preanalytical steps are critical for obtaining valid data of SAM and SAH in tissues.

Institute of Inherited Metabolic Disorders Charles University Prague 1st Faculty of Medicine Prague Czech Republic

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S. Clarke, K. Banfield, In: R. Carmel, D.W. Jacobsen (Eds.), Homocysteine in Health and Disease, Cambridge University Press, Cambridge, 2001, p. 63.

Finkelstein J.D., Kyle W.E., Harris B.J. Arch. Biochem. Biophys. 1974;165:774. PubMed

Caudill M.A., Wang J.C., Melnyk S., Pogribny I.P., Jernigan S., Collins M.D., Santos-Guzman J., Swendseid M.E., Cogger E.A., James S.J. J. Nutr. 2001;131:2811. PubMed

Choumenkovitch S.F., Selhub J., Bagley P.J., Maeda N., Nadeau M.R., Smith D.E., Choi S.W. J. Nutr. 2002;132:2157. PubMed

Loehrer F.M., Angst C.P., Brunner F.P., Haefeli W.E., Fowler B. Nephrol. Dial. Transplant. 1998;13:656. PubMed

McKeever M., Molloy A., Weir D.G., Young P.B., Kennedy D.G., Kennedy S., Scott J.M. Clin. Sci. (Lond.) 1995;88:73. PubMed

Tinton S., Buc-Calderon P. Biochem. J. 1995;310(Pt 3):893. PubMed PMC

Watanabe M., Osada J., Aratani Y., Kluckman K., Reddick R., Malinow M.R., Maeda N. Proc. Natl. Acad. Sci. USA. 1995;92:1585. PubMed PMC

Swanson D.A., Liu M.L., Baker P.J., Garrett L., Stitzel M., Wu J., Harris M., Banerjee R., Shane B., Brody L.C. Mol. Cell. Biol. 2001;21:1058. PubMed PMC

Elmore C.L., Wu X., Leclerc D., Watson E.D., Bottiglieri T., Krupenko N.I., Krupenko S.A., Cross J.C., Rozen R., Gravel R.A., Matthews R.G. Mol. Genet. Metab. 2007;91:85. PubMed PMC

Chen Z., Karaplis A.C., Ackerman S.L., Pogribny I.P., Melnyk S., Lussier-Cacan S., Chen M.F., Pai A., John S.W., Smith R.S., Bottiglieri T., Bagley P., Selhub J., Rudnicki M.A., James S.J., Rozen R. Hum. Mol. Genet. 2001;10:433. PubMed

Hamedani M.P., Valko K., Qi X., Welham K.J., Gibbons W.A. J. Chromatogr. 1993;619:191. PubMed

She Q.B., Nagao I., Hayakawa T., Tsuge H. Biochem. Biophys. Res. Commun. 1994;205:1748. PubMed

Wang W., Kramer P.M., Yang S., Pereira M.A., Tao L. J. Chromatogr. B Biomed. Sci. Appl. 2001;762:59. PubMed

Delabar U., Kloor D., Luippold G., Muhlbauer B. J. Chromatogr. B Biomed. Sci. Appl. 1999;724:231. PubMed

Bottiglieri T. Biomed. Chromatogr. 1990;4:239. PubMed

Wise C.K., Cooney C.A., Ali S.F., Poirier L.A. J. Chromatogr. B Biomed. Sci. Appl. 1997;696:145. PubMed

Helland S., Ueland P.M. Cancer. Res. 1982;42:1130. PubMed

Weir D.G., Molloy A.M., Keating J.N., Young P.B., Kennedy S., Kennedy D.G., Scott J.M. Clin. Sci. (Lond.) 1992;82:93. PubMed

Loehrer F.M., Haefeli W.E., Angst C.P., Browne G., Frick G., Fowler B. Clin. Sci. (Lond.) 1996;91:79. PubMed

Capdevila A., Wagner C. Anal. Biochem. 1998;264:180. PubMed

Melnyk S., Pogribna M., Pogribny I.P., Yi P., James S.J. Clin. Chem. 2000;46:265. PubMed

Uthus E.O. Electrophoresis. 2003;24:1221. PubMed

Stabler S.P., Allen R.H. Clin. Chem. 2004;50:365. PubMed

Struys E.A., Jansen E.E., de Meer K., Jakobs C. Clin. Chem. 2000;46:1650. PubMed

Gellekink H., van Oppenraaij-Emmerzaal D., van Rooij A., Struys E.A., den Heijer M., Blom H.J. Clin. Chem. 2005;51:1487. PubMed

Burren K.A., Mills K., Copp A.J., Greene N.D. J. Chromatogr. B: Analyt. Technol. Biomed. Life Sci. 2006;844:112. PubMed PMC

Helland S., Ueland P.M. Cancer Res. 1983;43:4142. PubMed

Shapiro S.K., Ehninger D.J. Anal. Biochem. 1966;15:323. PubMed

Gupta S., Wang L., Hua X., Krijt J., Kozich V., Kruger W.D. Hum. Mutat. 2008;29:1048. PubMed PMC

Gustavsson S.A., Samskog J., Markides K.E., Langstrom B. J. Chromatogr. A. 2001;937:41. PubMed

Hennion M.C., Coquart V., Guenu S., Sella C. J. Chromatogr. A. 1995;712:287.

Annesley T.M. Clin. Chem. 2003;49:1041. PubMed

Helland S., Ueland P.M. Cancer Res. 1983;43:1847. PubMed

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