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Targeted Imaging Agent to HSP70 Induced In Vivo.

Pradip Ghosh1, Brian E O'Neill2, King C Li3

  • 1Department of Neurology, UT Medical School, University of Texas Health Science Center, Houston, TX, USA.

Molecular Imaging
|November 20, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a noninvasive method to track heat shock protein 70 (HSP70) levels using deoxyspergualin-Cy5.5. Localized heat successfully induced HSP70 overexpression in mice, enabling targeted detection via fluorescence imaging.

Keywords:
Cy5.5DSGHSP70deoxyspergualinheat shock proteinsnear-infrared fluorescence

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Area of Science:

  • Biomedical imaging
  • Molecular biology
  • Biophysics

Background:

  • Heat shock proteins (HSPs) play crucial roles in cellular stress response.
  • Modulating HSP expression offers potential for targeted therapies and diagnostics.
  • Noninvasive in vivo imaging of specific protein expression remains a challenge.

Purpose of the Study:

  • To investigate the feasibility of using deoxyspergualin conjugated to a near-infrared fluorophore (DSG-Cy5.5) to detect heat-induced heat shock protein 70 (HSP70) overexpression.
  • To establish a noninvasive, spatially and temporally controlled method for monitoring HSP70 levels in vivo.

Main Methods:

  • Induction of HSP70 overexpression in normal mouse tissue via localized hyperthermia.
  • Administration of deoxyspergualin conjugated to the near-infrared fluorophore (DSG-Cy5.5).
  • Detection of fluorescence signal correlating with HSP70 levels using in vivo imaging.

Main Results:

  • Localized hyperthermia successfully induced significant HSP70 overexpression in living mice.
  • DSG-Cy5.5 conjugate allowed for the detection of heat-induced HSP70 overexpression.
  • The fluorescence signal intensity was dependent on the total energy delivered during hyperthermia, peaking 6-8 hours post-induction and declining within 24 hours.

Conclusions:

  • Deoxyspergualin-Cy5.5 serves as a viable imaging agent for detecting heat-induced HSP70 overexpression.
  • This approach offers a noninvasive, controllable method for monitoring cellular stress responses in vivo.
  • The findings support the potential of using targeted HSP70 modulation and imaging for diagnostic applications.