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Phosphate metabolites in rat skin
M Stubbs1, F Vanstapel, L M Rodrigues
1Department of Biochemistry, St. George's Hospital Medical School, London, UK.
NMR in Biomedicine
|February 1, 1988
Summary
Researchers developed a rat skin model for 31P NMR studies, identifying key phosphorus metabolites like ATP and phosphocreatine (PCr). Skin signals can influence tumor and organ NMR spectra.
Area of Science:
- Biochemistry
- Medical Imaging
- Animal Models
Background:
- Studying phosphorus metabolites in specific tissues is challenging due to signal overlap.
- 31P NMR is a valuable tool for non-invasively assessing cellular energy metabolism.
Purpose of the Study:
- To develop a reliable model for 31P NMR analysis of rat skin.
- To characterize phosphorus metabolite concentrations in rat skin.
- To investigate the contribution of skin signals to subcutaneous organ and tumor 31P NMR spectra.
Main Methods:
- Creation of a rat skin pedicle model to isolate skin tissue.
- Acquisition of 31P NMR spectra using a solenoidal coil and Faraday shield.
- Analysis of freeze-clamped skin pedicle extracts for phosphorus metabolite quantification.
Main Results:
- Identified phosphomonoesters, inorganic phosphate (Pi), phosphodiesters, phosphocreatine (PCr), and ATP in rat skin 31P NMR spectra.
- NMR-detected metabolite concentrations generally agreed with extract analysis, except for higher Pi in extracts.
- Observed broader signals likely from phospholipids, suggesting contributions beyond muscle tissue.
- Demonstrated that overlying rat skin can contribute PCr signals to subcutaneous tumors, varying by tumor type.
Conclusions:
- The rat skin pedicle model effectively isolates skin for 31P NMR analysis.
- Rat skin contains significant levels of phosphorus metabolites, including PCr and ATP.
- Skin signal contribution must be considered when interpreting 31P NMR spectra of subcutaneous tissues and tumors.