Document Detail

Analytical measurement of discrete hydrogen sulfide pools in biological specimens.
MedLine Citation:
PMID:  22561703     Owner:  NLM     Status:  MEDLINE    
Hydrogen sulfide (H₂S) is a ubiquitous gaseous signaling molecule that plays a vital role in numerous cellular functions and has become the focus of many research endeavors, including pharmacotherapeutic manipulation. Among the challenges facing the field is the accurate measurement of biologically active H₂S. We have recently reported that the typically used methylene blue method and its associated results are invalid and do not measure bona fide H₂S. The complexity of analytical H₂S measurement reflects the fact that hydrogen sulfide is a volatile gas and exists in the body in various forms, including a free form, an acid-labile pool, and bound as sulfane sulfur. Here we describe a new protocol to discretely measure specific H₂S pools using the monobromobimane method coupled with RP-HPLC. This new protocol involves selective liberation, trapping, and derivatization of H₂S. Acid-labile H₂S is released by incubating the sample in an acidic solution (pH 2.6) of 100 mM phosphate buffer with 0.1mM diethylenetriaminepentaacetic acid (DTPA), in an enclosed system to contain volatilized H₂S. Volatilized H₂S is then trapped in 100 mM Tris-HCl (pH 9.5, 0.1 mM DTPA) and then reacted with excess monobromobimane. In a separate aliquot, the contribution of the bound sulfane sulfur pool was measured by incubating the sample with 1 mM TCEP (tris(2-carboxyethyl)phosphine hydrochloride), a reducing agent, to reduce disulfide bonds, in 100 mM phosphate buffer (pH 2.6, 0.1 mM DTPA), and H₂S measurement was performed in a manner analogous to the one described above. The acid-labile pool was determined by subtracting the free hydrogen sulfide value from the value obtained by the acid-liberation protocol. The bound sulfane sulfur pool was determined by subtracting the H₂S measurement from the acid-liberation protocol alone compared to that of TCEP plus acidic conditions. In summary, our new method allows very sensitive and accurate measurement of the three primary biological pools of H₂S, including free, acid-labile, and bound sulfane sulfur, in various biological specimens.
Xinggui Shen; Elvis A Peter; Shyamal Bir; Rui Wang; Christopher G Kevil
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-04-19
Journal Detail:
Title:  Free radical biology & medicine     Volume:  52     ISSN:  1873-4596     ISO Abbreviation:  Free Radic. Biol. Med.     Publication Date:    2012 Jun 1-15
Date Detail:
Created Date:  2012-06-18     Completed Date:  2012-10-16     Revised Date:  2014-03-14    
Medline Journal Info:
Nlm Unique ID:  8709159     Medline TA:  Free Radic Biol Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2276-83     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
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MeSH Terms
Bicyclo Compounds / chemistry
Chemistry Techniques, Analytical
Chromatography, High Pressure Liquid
Hydrogen Sulfide / analysis*
Pentetic Acid / chemistry
Phosphines / chemistry
Young Adult
Grant Support
Reg. No./Substance:
0/Bicyclo Compounds; 0/Phosphines; 0/Sulfides; 0/persulfides; 22OAC2MO2S/tris(2-carboxyethyl)phosphine; 71418-44-5/monobromobimane; 7A314HQM0I/Pentetic Acid; YY9FVM7NSN/Hydrogen Sulfide

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