Document Detail

Bactenecin 7 peptide fragment as a tool for intracellular delivery of a phosphorescent oxygen sensor.
MedLine Citation:
PMID:  20883447     Owner:  NLM     Status:  In-Process    
Research on cell-penetrating peptides for the intracellular delivery of porphyrin compounds has mainly focused on the use of trans-activator of transcription (TAT)-derived peptides and, to a lesser extent, on proline-rich peptides and phosphorescent metalloporphyrins. In this article, we describe a novel phosphorescent oxygen-sensitive probe for intracellular use which comprises a bactenecin 7 peptide fragment (15-24) conjugated with the uncharged monofunctional derivative of Pt(II) coproporphyrin I (PEPP0). This probe provides efficient loading of various mammalian cells, including PC12, HCT116, SH-SY5Y and HeLa, via cell-type-dependent uptake mechanisms. The conjugate displays a similar distribution in cytoplasm and mitochondria which allows local oxygen levels to be monitored. Respiratory responses of PC12 cells loaded with the conjugate, measured on a time-resolved fluorescent reader, showed significant cell deoxygenation in response to uncoupling by carbonyl cyanide 4-(trifluoromethoxy)phenylhydrazone and external hypoxia. Treatment with mitochondrial inhibitors led to a decrease in cell deoxygenation. Although the biophysical properties of this conjugate are similar to those of the phosphorescent intracellular oxygen-sensitive probes described previously, it possesses a number of advantages, including ease of synthesis, high loading efficiency and reliability in physiological experiments with cells. This intracellular probe can be employed for the measurement of intracellular O(2) levels in samples containing mammalian cells using the phosphorescence quenching technique. In addition, the responses to metabolic stimuli can be assessed in a wide range of cells, as can the levels of relative cell oxygenation under external hypoxia.
Ruslan I Dmitriev; Honorata M Ropiak; Dmitri V Yashunsky; Gelii V Ponomarev; Alexander V Zhdanov; Dmitri B Papkovsky
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-09-30
Journal Detail:
Title:  The FEBS journal     Volume:  277     ISSN:  1742-4658     ISO Abbreviation:  FEBS J.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101229646     Medline TA:  FEBS J     Country:  England    
Other Details:
Languages:  eng     Pagination:  4651-61     Citation Subset:  IM    
Copyright Information:
© 2010 The Authors Journal compilation © 2010 FEBS.
Biochemistry Department, University College Cork, Cork, Ireland.
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