Adv Pharm Bull. 2016;6(2):227-233.
doi: 10.15171/apb.2016.031
PMID: 27478785
PMCID: PMC4961981
Scopus id: 84980410667
  Abstract View: 454
  PDF Download: 346

Research Article

Interactions Between Sirolimus and Anti-Inflammatory Drugs: Competitive Binding for Human Serum Albumin

Arash Khodaei 1, Soheila Bolandnazar 1, Hadi Valizadeh 1, Leila Hasani 2, Parvin Zakeri-Milani 3 *

1 Drug Applied Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
2 Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences, Zanjan, Iran.
3 Liver and Gastrointestinal Diseases Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.


Purpose: The aim of the present study was investigating the effects of three anti-inflammatory drugs, on Sirolimus protein biding. The binding site of Sirolimus on human serum albumin (HSA) was also determined.

Methods: Six different concentrations of Sirolimus were separately exposed to HSA at pH 7.4 and 37°C. Ultrafiltration method was used for separating free drug; then free drug concentrations were measured by HPLC. Finally, Sirolimus protein binding parameters was calculated using Scatchard plots. The same processes were conducted in the presence of NSAIDs at lower concentration of albumin and different pH conditions. To characterize the binding site of Sirolimus on albumin, the free concentration of warfarin sodium and Diazepam, site I and II specific probes, bound to albumin were measured upon the addition of increasing Sirolimus concentrations.

Results: Based on the obtained results presence of Diclofenac, Piroxicam and Naproxen, could significantly decrease the percentage of Sirolimus protein binding. The Binding reduction was the most in the presence of Piroxicam. Sirolimus-NSAIDs interactions were increased in higher pH values and also in lower albumin concentrations. Probe displacement study showed that Sirolimus may mainly bind to site I on albumin molecule.

Conclusion: More considerations in co-administration of NSAIDs and Sirolimus is recommended.

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Submitted: 03 Feb 2016
Revised: 04 May 2016
Accepted: 08 May 2016
First published online: 29 Jun 2016
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