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Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a...
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Development of a fluorogenic small substrate for dipeptidyl peptidase-4.

Futa Ogawa1, Masanori Takeda1, Kanae Miyanaga2

  • 1Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata, Osaka 573-0101, Japan.

Beilstein Journal of Organic Chemistry
|March 23, 2018
PubMed
Summary

Chemically stable fluorescent organic compounds were synthesized. These compounds, used as fluorogenic substrates, enable sensitive detection of dipeptidyl peptidase-4 (DPP-4) enzyme activity via fluorescence monitoring.

Keywords:
dipeptidyl peptidase-4fluorogenic substratefluorometrysmall fluorescent molecule

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Area of Science:

  • Organic Chemistry
  • Biochemistry
  • Analytical Chemistry

Background:

  • Development of novel fluorescent organic compounds is crucial for sensitive bioanalytical applications.
  • Small, chemically stable fluorophores are desirable for robust probe design.
  • Enzyme activity monitoring often requires specific substrates that yield a detectable signal upon cleavage.

Purpose of the Study:

  • To synthesize novel aniline and m-phenylenediamine derivatives with trifluoropropenyl substituents.
  • To evaluate the fluorescence properties of these synthesized compounds.
  • To develop a fluorogenic substrate for dipeptidyl peptidase-4 (DPP-4) detection.

Main Methods:

  • Synthesis of aniline and m-phenylenediamine derivatives.
  • Conversion of a 2,4-disubstituted aniline derivative (1) into a non-fluorescent dipeptide analogue (H-Gly-Pro-1).
  • Enzymatic hydrolysis assay using DPP-4 and fluorometric monitoring of released compound 1.

Main Results:

  • Successfully synthesized small, chemically stable fluorescent organic compounds.
  • Demonstrated the utility of compound 1 as a fluorophore.
  • Established H-Gly-Pro-1 as a fluorogenic substrate for DPP-4, with activity monitored by fluorescence.

Conclusions:

  • The synthesized aniline and m-phenylenediamine derivatives exhibit promising fluorescence characteristics.
  • Compound 1 can serve as a useful fluorophore in developing OFF-ON type fluorogenic probes.
  • The developed fluorogenic substrate H-Gly-Pro-1 is effective for monitoring DPP-4 enzymatic activity.