Future University In Egypt (FUE)
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Altagamoa Al Khames, Main centre of town, end of 90th Street
New Cairo
Egypt

Youmna Ibrahim

Basic information

Name : Youmna Ibrahim
Title: Assistant Lecturer
Personal Info: Youmna Ibrahim, Assistant Lecturer of Pharmaceutical Chemsirty - Department of pharmaceutical chemistry. She has a bachelor degree in Pharmaceutical Sciences from Future University in Egypt in 2011. View More...

Education

Certificate Major University Year
Masters Pharmaceutical Chemsirty Cairo University - Faculty of Pharmacy 2017
Bachelor Pharmaceutical Sciences and Pharmaceutical Industries future university - Faculty of Pharmacy 2011

Teaching Experience

Name of Organization Position From Date To Date
El Azaby Pharmacy Pharmacist 01/01/2009 01/01/2010

Researches /Publications

Thiazolo [4, 5-d] pyridazine analogues as a new class of dihydrofolate reductase (DHFR) inhibitors: Synthesis, biological evaluation and molecular modeling study. - 01/1

Yomna Ibrahim Hassan El Gazzar

Dalal A.Abou El Ellab,Deena S.Lasheen

01/10/2017

A new series of 1,3-thiazoles and thiazolo[4,5-d]pyridazine both bearing the 2-thioureido function were designed, synthesized and evaluated for their in vitro DHFR inhibition and antitumor activities. Compound 26 proved to be the most active DHFR inhibitor (IC50 of 0.06 μM). Compound 4, 20 and 21 showed in vitro antitumor activity against a collection of cancer cell lines. Compound 26 proved lethal to HS 578T breast cancer cell line with IC50 value of 0.8 μM, inducing cell cycle arrest and apoptosis. Molecular modeling studies concluded that recognition with key amino acids Phe 31 and Arg 22 is essential for DHFR binding. The obtained model could be useful for the development of new class of DHFR inhibitors.

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Synthesis, biological evaluation and molecular modeling study of new (1, 2, 4-triazole or 1, 3, 4-thiadiazole)-methylthio-derivatives of quinazolin-4 (3H)-one as DHFR inhibitors. - 01/0

Yomna Ibrahim Hassan El Gazzar

Hanan H.Georgey,Shahenda M.El-Messery, Ghada S.Hassane

01/06/2017

A new series of 2-mercapto-quinazolin-4-one analogues was designed, synthesized and evaluated for their in vitro DHFR inhibition, antitumor and antimicrobial activity. Compound 17 proved to be the most active DHFR inhibitor with IC50 value of 0.01 μM, eight fold more active than methotrexate (MTX). Compounds 16 and 24 showed antitumor activity against human Caco2 colon and MCF-7 breast tumor cell lines with IC50 values of 25.4 and 9.5 μg/ml, respectively. Compounds 15, 20, 21 and 30 showed considerable activity against the Gram-positive bacteria Staphylococcus aureus while 24 and 30 proved active against Bacillus subtilis with a magnitude of potency comparable to the broad spectrum antibiotic Ciprofloxacin. Strong activity was observed for 13, 14, 19, 20 and 24 against Candida albicans and Aspergillus flavus. Compound 17 shared a similar molecular docking mode with MTX and made a critical hydrogen bond and arene-arene interactions via Ala9 and Phe34 amino acid residues, respectively.

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Synthesis, biological evaluation and molecular modeling study of new (1, 2, 4-triazole or 1, 3, 4-thiadiazole)-methylthio-derivatives of quinazolin-4 (3H)-one as DHFR inhibitors - 01/0

Yomna Ibrahim Hassan El Gazzar

Hanan H. Georgey, Shahenda M. El-Messery, Ghada S. Hassan,

01/06/2016

A new series of 2-mercapto-quinazolin-4-one analogues was designed, synthesized and evaluated for their in vitro DHFR inhibition, antitumor and antimicrobial activity. Compound 17 proved to be the most active DHFR inhibitor with IC50 value of 0.01 μM, eight fold more active than methotrexate (MTX). Compounds 16 and 24 showed antitumor activity against human Caco2 colon and MCF-7 breast tumor cell lines with IC50 values of 25.4 and 9.5 μg/ml, respectively. Compounds 15, 20, 21 and 30 showed considerable activity against the Gram-positive bacteria Staphylococcus aureus while 24 and 30 proved active against Bacillus subtilis with a magnitude of potency comparable to the broad spectrum antibiotic Ciprofloxacin. Strong activity was observed for 13, 14, 19, 20 and 24 against Candida albicans and Aspergillus flavus. Compound 17 shared a similar molecular docking mode with MTX and made a critical hydrogen bond and arene-arene interactions via Ala9 and Phe34 amino acid residues, respectively.

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