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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
08:44

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Published on: February 23, 2016

Pharmaceutical formulation affects titanocene transferrin interactions.

Katherine M Buettner1, Robert C Snoeberger, Victor S Batista

  • 1Yale University, New Haven, CT 06520-8107, USA.

Dalton Transactions (Cambridge, England : 2003)
|August 18, 2011
PubMed
Summary
This summary is machine-generated.

Titanocene dichloride (TDC) derivatives like MKT4 show anticancer activity. MKT4 interacts differently with human serum transferrin than TDC, potentially impacting clinical trial outcomes.

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Area of Science:

  • Inorganic Chemistry
  • Medicinal Chemistry
  • Biochemistry

Background:

  • Titanocene dichloride (TDC) exhibits anticancer properties, leading to the development of derivatives.
  • MKT4, a stable formulation of TDC, advanced to human clinical trials (Phase I and II).
  • Human serum transferrin is a known carrier for titanium-based anticancer drugs.

Purpose of the Study:

  • To characterize MKT4 speciation and its interaction with human serum transferrin.
  • To compare the binding kinetics and thermodynamics of MKT4 versus TDC with transferrin.
  • To investigate the influence of malate on MKT4-transferrin interactions.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy ((1)H and (13)C)
  • Fourier Transform Ion Cyclotron Resonance (FT-ICR) mass spectrometry
  • UV/vis absorption and fluorescence quenching spectroscopy
  • Density Functional Theory (DFT) calculations

Main Results:

  • MKT4 exhibits distinct binding kinetics and a different molar absorptivity (7500 M(-1) cm(-1) per site) with transferrin compared to TDC.
  • Malate, present in the MKT4 buffer, acts synergistically, altering charge transfer energy and reducing molar absorptivity to 5000 M(-1) cm(-1) per site.
  • These formulation-induced differences in transferrin binding may explain clinical trial observations.

Conclusions:

  • The formulation of titanocene dichloride as MKT4 significantly alters its interaction with human serum transferrin.
  • Malate plays a crucial role in modulating MKT4-transferrin binding.
  • Understanding these formulation effects is critical for interpreting clinical trial data and developing future titanium-based anticancer agents.