Abstract
Broad-spectrum β-lactam antibiotics such as penicillin are routinely used against both Gram-negative and Gram-positive bacteria. However, bacteria that produce β-lactamase have developed resistance against these antibiotics by cleaving the β-lactam ring and rendering the antibiotic inactive. To combat this effect, 1,4,7- Triazacyclononane (TACN), a cyclic organic compound derived from cyclononanes has been shown to preserve the activity of β-lactam antibiotics by inhibiting β-lactamase. However, its cytotoxic effects require elucidation. Given that the cytotoxic target for many therapeutics is the kidney, this study investigated the effects of TACN on human embryonic kidney cells (Hek293) cells. Hek293 cells were treated with TACN (0–500 µM) for 24 h and the cytotoxicity was assessed (MTT and LDH assay). Apoptosis was luminometrically detected by measuring phosphatidylserine externalisation and caspase activity and fluorescently detecting necrosis. DNA fragmentation was visualised using fluorescent microscopy. Expression of the apoptosis-related protein were determined by western blot. The results generated indicate that TACN does not initiate necrosis as LDH was decreased. Likewise, decreased apoptosis was supported by the decreased phosphatidylserine, caspases, Bax, cleaved PARP, IAP and NF-kB. However, increased DNA fragmentation was associated with increased p53. Therefore, effects of TACN at the nucleus, produced a p53 response to initiate DNA repair and did not culminate in cell death. The findings show that TACN is not cytotoxic to Hek293 cells via the apoptotic route. Since TACN did not induce cell death, its potential as a metallo-β-lactamase inhibitor (MBLI) may be exploited to counteract the effect of MBL-producing bacteria. Restoring β-lactam activity will curb the global menace of antibiotic resistance.
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The generated data used to support the findings of this study are included within the article.
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The authors are grateful for the financial assistance from the College of Health Sciences, University of KwaZulu-Natal, South Africa.
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Tsotetsi, N., Amoako, D.G., Somboro, A.M. et al. Molecular mechanisms underlying the renoprotective effects of 1,4,7-triazacyclononane: a βeta-lactamase inhibitor. Cytotechnology 72, 785–796 (2020). https://doi.org/10.1007/s10616-020-00422-7
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DOI: https://doi.org/10.1007/s10616-020-00422-7