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Hydroxyurea-Lactose Interaction Study: In Silico and In Vitro Evaluation

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Abstract

The Maillard reaction between hydroxyurea (a primary amine-containing drug) and lactose (used as an excipient) was explored. The adduct of these compounds was synthesized by heating hydroxyurea with lactose monohydrate at 60 °C in borate buffer (pH 9.2) for 12 h. Synthesis of the adduct was confirmed using UV–visible spectroscopy and Fourier transform infrared, differential scanning calorimetry, high-pressure liquid chromatography, and liquid chromatography-mass spectrometry studies. An in silico investigation of how the adduct formation affected the interactions of hydroxyurea with its biological target oxyhemoglobin, to which it binds to generate nitric oxide and regulates fetal hemoglobin synthesis, was carried out. The in silico evaluations were complemented by an in vitro assay of the anti-sickling activity. Co-incubation of hydroxyurea with deoxygenated blood samples reduced the percentage of sickled cells from 38% to 12 ± 1.6%, whereas the percentage of sickled cells in samples treated with the adduct was 17 ± 1.2%. This indicated loss of anti-sickling activity in the case of the adduct. This study confirmed that hydroxyurea can participate in a Maillard reaction if lactose is used as a diluent. Although an extended study at environmentally feasible temperatures was not carried out in the present investigation, the partial loss of the anti-sickling activity of hydroxyurea was investigated along with the in silico drug–target interactions. The results indicated that the use of lactose in hydroxyurea formulations needs urgent reconsideration and that lactose must be replaced by other diluents that do not form Maillard adducts.

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ACKNOWLEDGEMENTS

The authors are thankful to Neon Laboratories Ltd., Mumbai for providing the hydroxyurea sample required for this study as a gift. The authors are thankful to the Indian Institute of Technology Bombay for providing the LC-MS facility.

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Authors and Affiliations

  1. H. R. Patel Institute of Pharmaceutical Education and Research, Dist. Dhule, Shirpur, Maharashtra, India

    Kunal B. Bachchhao & Dipak D Patil

  2. R. C. Patel Institute of Pharmaceutical Education and Research, Dist. Dhule, Shirpur, Maharashtra, India

    R. R. Patil & C. R. Patil

Authors
  1. Kunal B. Bachchhao
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  2. R. R. Patil
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  3. C. R. Patil
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  4. Dipak D Patil
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Correspondence to Kunal B. Bachchhao or Dipak D Patil.

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Bachchhao, K.B., Patil, R.R., Patil, C.R. et al. Hydroxyurea-Lactose Interaction Study: In Silico and In Vitro Evaluation. AAPS PharmSciTech 18, 3034–3041 (2017). https://doi.org/10.1208/s12249-017-0791-4

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  • DOI: https://doi.org/10.1208/s12249-017-0791-4

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