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Title Polyamines Mitigate Antibiotic Inhibition of A.actinomycetemcomitans Growth
Publication Date
Degree MS
Discipline/Department Dentistry
Degree Level masters
University/Publisher The Ohio State University
Abstract Polyamines are ubiquitous polycationic molecules that are present in all prokaryotic and eukaryotic cells. They are the breakdown products of amino acids and are important modulators of cell growth, stress and cell proliferation. Polyamines are present in higher concentrations in the periodontal pocket and may affect antibiotic resistance of bacterial biofilms. The effect of polyamines was investigated with amoxicillin (AMX), azithromycin (AZM) and doxycycline (DOX) on the growth of Aggregatibacter actinomycetemcomitans (A.a.) Y4 strain. Bacteria were grown in brain heart infusion broth under the following conditions: 1) A.a. only, 2) A.a. + antibiotic, 3) A.a. + antibiotic + polyamine mix (1.4mM putrescine, 0.4mM spermidine, 0.4mM spermine). Growth curve analysis, MIC determination and metatranscriptomic analysis were carried out. The presence of exogenous polyamines produced a small, but significant increase in growth of A.a. Polyamines mitigated the inhibitory effect of AMX, AZM and DOX on A.a. growth. Metatranscriptomic analysis revealed differing transcriptomic profiles when comparing AMX and AZM in the presence of polyamines. Polyamines produced a transient mitigation of AMX inhibition, but did not have a significant effect on gene transcription. Many gene transcription changes were seen when polyamines were in the presence of AZM. Polyamines in a periodontal pocket may help protect A.a. and contribute to antimicrobial resistance.
Subjects/Keywords Dentistry
Contributors Walters, John (Advisor)
Language en
Rights unrestricted ; This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
Country of Publication us
Format application/pdf
Record ID oai:etd.ohiolink.edu:osu1498143446132264
Repository ohiolink
Date Indexed 2021-01-29
Grantor The Ohio State University

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