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10.1097/FTD.0000000000000081 http://scihub22266oqcxt.onion/10.1097/FTD.0000000000000081 C4687018!4687018!24739663     free     free     free Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534       Ther+Drug+Monit 2014 ; 36 (6): 716-23 Nephropedia Template TP {{tp|p=24739663|t=2014. The Effects of Unbound Mycophenolic Acid (MPA) on Inosine Monophosphate Dehydrogenase (IMPDH) Inhibition in Pediatric Kidney Transplant Patients |pdf=|usr=}}{{24739663}} gab.com Text The Effects of Unbound Mycophenolic Acid (MPA) on Inosine Monophosphate Dehydrogenase (IMPDH) Inhibition in Pediatric Kidney Transplant Patients JO: Ther Drug Monit http://www.kidney.de/pget.php?&tw=1&pmid=24739663 #FOAvip Background: Mycophenolic acid (MPA) is a key immunosuppressive drug that acts through inhibition of inosine monophosphate dehydrogenase (IMPDH). MPA is commonly measured as part of therapeutic drug monitoring as the total concentration in plasma. However, it has been postulated that the free (unbound) fraction of MPA (fMPA) is responsible for the immunosuppressive effects. In this study, a sensitive low volume high performance liquid chromatography (HPLC) assay was developed to measure fMPA concentrations in order to explore the relationship between fMPA and IMPDH activity. Methods: To obtain fMPA concentrations, plasma samples were filtrated using Centrifree® Ultrafiltration Devices. The ultrafiltrate was analyzed by HPLC using a Kinetex® C18 column (2.6 ?m, 3.0 × 75 mm). fMPA concentrations were compared to total MPA concentrations available in 28 pediatric kidney transplant patients at 3 consecutive occasions post-transplantation. The relationship between fMPA and IMPDH activity was analyzed using an Emax-model. Results: The HPLC-assay using 25?L of the ultrafiltrates was validated over a range from 2.5 to 1000 ?g/L with good accuracy, precision and reproducibility. Total and free MPA concentrations were well correlated (R2 = 0.85, P < 0.0001) although large intra-and inter-individual variability in the bound MPA fractions was observed. The overall relationship between fMPA concentrations and IMPDH inhibition using the Emax-model was comparable to that of total MPA as previously reported. The model estimated EC50 (164.5 ?g/L) is in good agreement with reported in vitro EC50 values. Conclusions: This study provides a simple HPLC method for the measurement of fMPA and a pharmacologically reasonable EC50-estimate. The good correlation between total and free MPA concentrations suggests that routine measurement of fMPA to characterize mycophenolate PK/PD does not seem warranted although the large variability in the bound fractions of MPA warrants further study. Twit Text FOAVip The Effects of Unbound Mycophenolic Acid (MPA) on Inosine Monophosphate Dehydrogenase (IMPDH) Inhibition in Pediatric Kidney Transplant Patients ????Ther Drug Monit http://www.kidney.de/pget.php?&tw=1&pmid=24739663 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=24739663 #FOAvip English Wikipedia <ref>{{Cite pmid|24739663}}</ref> The Effects of Unbound Mycophenolic Acid (MPA) on Inosine Monophosphate Dehydrogenase (IMPDH) Inhibition in Pediatric Kidney Transplant Patients #MMPMID24739663 Smits TA; Cox S; Fukuda T; Sherbotie J; Ward R; Goebel J; Vinks AA Ther Drug Monit 2014[Dec]; 36 (6): 716-23 PMID24739663show ga Background: Mycophenolic acid (MPA) is a key immunosuppressive drug that acts through inhibition of inosine monophosphate dehydrogenase (IMPDH). MPA is commonly measured as part of therapeutic drug monitoring as the total concentration in plasma. However, it has been postulated that the free (unbound) fraction of MPA (fMPA) is responsible for the immunosuppressive effects. In this study, a sensitive low volume high performance liquid chromatography (HPLC) assay was developed to measure fMPA concentrations in order to explore the relationship between fMPA and IMPDH activity. Methods: To obtain fMPA concentrations, plasma samples were filtrated using Centrifree® Ultrafiltration Devices. The ultrafiltrate was analyzed by HPLC using a Kinetex® C18 column (2.6 ?m, 3.0 × 75 mm). fMPA concentrations were compared to total MPA concentrations available in 28 pediatric kidney transplant patients at 3 consecutive occasions post-transplantation. The relationship between fMPA and IMPDH activity was analyzed using an Emax-model. Results: The HPLC-assay using 25?L of the ultrafiltrates was validated over a range from 2.5 to 1000 ?g/L with good accuracy, precision and reproducibility. Total and free MPA concentrations were well correlated (R2 = 0.85, P < 0.0001) although large intra-and inter-individual variability in the bound MPA fractions was observed. The overall relationship between fMPA concentrations and IMPDH inhibition using the Emax-model was comparable to that of total MPA as previously reported. The model estimated EC50 (164.5 ?g/L) is in good agreement with reported in vitro EC50 values. Conclusions: This study provides a simple HPLC method for the measurement of fMPA and a pharmacologically reasonable EC50-estimate. The good correlation between total and free MPA concentrations suggests that routine measurement of fMPA to characterize mycophenolate PK/PD does not seem warranted although the large variability in the bound fractions of MPA warrants further study. äThe Effects of Unbound Mycophenolic Acid (MPA) on Inosine Monophosphat(epmc).pdf DeepDyve Pubget Overpricing