Removal of Unreacted Dinitrophenyl Hydrazine from Carbonyl Derivatives. Amira Barkal Mentored by Dr. Gary Merrill Biochemistry and Biophysics
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1 Removal of Unreacted Dinitrophenyl Hydrazine from Carbonyl Derivatives Amira Barkal Mentored by Dr. Gary Merrill Biochemistry and Biophysics
2 Carbonyls and Disease Alzheimer s Disease Degenerative brain disease Irreversible tissue damage 7 th leading cause of death among Americans Affects 5.1 million Americans Cytotoxic carbonyls in higher amounts in Alzheimer s patients 1 Oxidative stress Tissue damage Toxicol Appl Pharmacol 2002 Nov 1;184(3):
3 Carbonyls: Definition Reactive Only aldehyde and ketone compounds
4 Carbonyl Function Reactive intermediates A B C Easy for the reaction to proceed How do organisms control these carbonyl intermediates to prevent damage?
5 Carbonyl Regulation Normally in very small amounts 0.1 % of the cytosol Reducing agents Carbonyl reductases Aldehyde or Ketone Reactive Carbonyl Reductase Alcohol More stable
6 Studying Carbonyls Very hard to study Small amounts Reactive Many carbonyl metabalomics pathways undiscovered Not a determined protocol to study carbonyls from tissues
7 Merrill Lab and Carbonyls Thioredoxin reductase (TR1) Reduces thioredoxin Part of thioredoxin pathway Reduces disulfide bonds Discovered intrinsic carbonyl reducing capability In vitro analysis 2 In vitro analysis performed by Cameron Long in Merrill Lab Thioredoxin Reductase
8 Merrill Lab and Carbonyls Studies mice lacking TR1 in liver TR + liver TR null liver vs. Wildtype TR levels Wildtype carbonyl reductase 3 (Cbr3) mrna levels No TR in livers 60-fold higher levels Cbr3 mrna levels
9 Merrill Lab and Carbonyls Wildtype +TR Aldehyde or Ketone Thioredoxin Reductase Alcohol Mutant -TR Aldehyde or Ketone Thioredoxin Carbonyl Reductase Alcohol
10 Goal Identify carbonyl compounds that accumulate in mutant mice because TR1 is missing Determine a general method by which carbonyls can be collected and identified from tissues
11 2,4-Dinitrophenylhydrazine (DNPH) 2,4-Dinitrophenylhydrazine Aldehyde or Ketone Stable Hydrazone Acidic conditions 1 M HCl Must be used in great excess with tissues to ensure all carbonyls react
12 Experimental Protocol Wildtype or Mutant Liver Flash freeze Pulverize under liquid nitrogen Methanol extract Centrifuge Methanol Insoluble Material Methanol Soluble Material Soluble Hydrazones Remove Excess DNPH Treat with excess DNPH Spin Insoluble Hydrazones Resolubilize in New Solvent Mass Spectrometry Analysis
13 Removing Unreacted DNPH Why? Excess DNPH complicates mass spectrometry results because DNPH breakdown products would be identical to hydrazone breakdown products Hypothesis: A resin treatment of soluble hydrazones will bind unreacted DNPH and allow the passage of hydrazones.
14 Dowex 50-X8 Ion Exchange Resin Research 3 indicates DNPH binds to ion exchange resins Acidic conditions DNPH positively charged Resin has sulfonates on bead with H + bound Resin exchanges DNPH cation for H + Journal of Chromatography, 626 (1992) Elsevier Science Publishers B.V., Amsterdam Dowex 50-X8 Resin Bead
15 Criteria for Resin Removal Technique 1. Must bind DNPH under acidic conditions. 2. Must not bind hydrazones under acidic conditions.
16 Resin Binding DNPH Testing binding affinity 2.5 mm solution of DNPH in EtOH and 1 M HCl Passed through column of 0.5 ml activated Dowex resin DNPH is yellow Peak absorbance at 362 nm Volumes (ml) of 2.5 mm DNPH solution passed through resin Absorbance of run-off measured at 362 nm in spectrophotometer
17 Dowex Resin DNPH Binding Affinity Absorbance of DNPH in Run-off after Resin Treatment Absorbance at 362 nm Micromoles DNPH Added
18 Criteria for Resin Removal Technique 1. Must bind DNPH under acidic conditions. 2. Must not bind hydrazones under acidic conditions.
19 Resin Binding of Hydrazone Test the resin binding affinity for hydrazone Hydrazones of three model compounds formed and resolubulized in respective solvents Menadione Pyruvate -Ketoglutarate
20 Resin Binding of Hydrazone Hydrazone Staining: Hydrazones turn a deep blue or brown in the presence of base (a full volume of 2 M NaOH) Hydrazones were stained with 2 M NaOH, and absorbances of 1:40 dilutions measured at peak wavelengths before and after resin treatment Percent recovery was calculated Hydrazone Color in Presence of Base Peak Wavelength
21 Recovery of Hydrazones after Resin Treatment
22 Criteria for Resin Removal Technique 1. Must bind DNPH under acidic conditions. 2. Must not bind hydrazones under acidic conditions.
23 Conclusions and Looking Ahead A viable solution for the removal of unreacted DNPH was determined Mass spectrometry results obtained explained by Thi Nguyen The method for harvesting carbonyls from mutant and wildtype livers is still being tested Looking ahead to: identifying a piece of the thioredoxin reductase pathway. determining best method for measuring carbonyl levels and identities from tissues.
24 Acknowledgements HHMI Cripps Undergraduate Research URISC Dr. Gary Merrill Dr. Fred Stevens Thi Nguyen The Mass Spectrometry Lab Dr. Kevin Ahern
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