- Synthesis and antibiotic activity of novel acylated phloroglucinol compounds against methicillin-resistant Staphylococcus aureus
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The rise in antibiotic resistance among pathogenic microorganisms has created an imbalance in the drugs available for treatment, in part due to the slow development of new antibiotics. Cystic fibrosis (CF) patients are highly susceptible to antibiotic-resistant pathogens, including methicillin-resistant Staphylococcus aureus (MRSA). Phloroglucinols and related polyketide natural products have demonstrated antimicrobial activity against a number of Gram-positive bacteria including S. aureus. In this study, we investigated a series of acylated phloroglucinol derivatives to determine their potential as lead compounds for the design of novel therapeutics. To assess the activity of these compounds, we determined the minimum inhibitory and bactericidal concentration (MIC and MBC, respectively), the minimum biofilm inhibitory and biofilm eradication concentration (MBIC and MBEC, respectively), and evaluated hemolytic activity, as well as their interaction with clinically relevant antibiotics. Of the 12 compounds tested against MRSA and methicillin-susceptible strains, four showed MIC values ranging from 0.125 to 8 μg ml?1 and all of them were bactericidal. However, none of the compounds were able to eradicate biofilms at the concentrations tested. Three of the four did not display hemolytic activity under the conditions tested. Further studies on the interactions of these compounds with clinically relevant antibiotics showed that phlorodipropanophenone displayed synergistic activity when paired with doxycycline. Our results suggest that these acylated phloroglucinols have potential for being further investigated as antibacterial leads.
- Mittal, Navriti,Tesfu, Haben H.,Hogan, Andrew M.,Cardona, Silvia T.,Sorensen, John L.
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p. 253 - 259
(2019/02/19)
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- 2. 4 - Diacetyl phloroglucinol analogue and its preparation method and application
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The invention discloses a 2,4-DAPG analogue and a preparation method and application thereof. The structure of the 2,4-DAPG analogue is shown as the formula (1) or formula (2), wherein R is C2-C15 alkyl, R1 and R2 are C1-C15 alkyl, and the R1 and the R2 a
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Paragraph 0024; 0031; 0050
(2018/05/30)
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- Synthesis and P-glycoprotein induction activity of colupulone analogs
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Brain amyloid-beta (Aβ) plaques are one of the primary hallmarks associated with Alzheimer's disease (AD) pathology. Efflux pump proteins located at the blood-brain barrier (BBB) have been reported to play an important role in the clearance of brain Aβ, among which the P-glycoprotein (P-gp) efflux transporter pump has been shown to play a crucial role. Thus, P-gp has been considered as a potential therapeutic target for treatment of AD. Colupulone, a prenylated phloroglucinol isolated from Humulus lupulus, is known to activate pregnane-X-receptor (PXR), which is a nuclear receptor controlling P-gp expression. In the present work, we aimed to synthesize and identify analogs of colupulone that are potent P-gp inducer(s) with an ability to enhance Aβ transport across the BBB. A series of colupulone analogs were synthesized by modifications at both prenyl as well as acyl domains. All compounds were screened for P-gp induction activity using a rhodamine 123 based efflux assay in the P-gp overexpressing human adenocarcinoma LS-180 cells, wherein all compounds showed significant P-gp induction activity at 5 μM. In the western blot studies in LS-180 cells, compounds 3k and 5f were able to induce P-gp as well as LRP1 at 1 μM. The effect of compounds on the Aβ uptake and transport was then evaluated. Among all tested compounds, diprenylated acyl phloroglucinol 5f displayed a significant increase (29%) in Aβ transport across bEnd3 cells grown on inserts as a BBB model. The results presented here suggest the potential of this scaffold to enhance clearance of brain Aβ across the BBB and thus its promise for development as a potential anti-Alzheimer agent.
- Bharate, Jaideep B.,Batarseh, Yazan S.,Wani, Abubakar,Sharma, Sadhana,Vishwakarma, Ram A.,Kaddoumi, Amal,Kumar, Ajay,Bharate, Sandip B.
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p. 5488 - 5496
(2015/05/20)
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- Ortho-amidoalkylation of phenols via tandem one-pot approach involving oxazine intermediate
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A new and efficient method for ortho-amidoalkylation of phenols via Mannich-type condensation with formaldehyde and lactams using recyclable solid acid catalyst is described. This is the first report for ortho-amidoalkylation of phenols by lactams via Mannich-type condensation. LC-ESI-MS/MS based mechanistic study revealed that reaction proceeds through o-quinone methide (o-QM) and an oxazine intermediate via tandem Knoevenagel condensation, formal [4 + 2]-Diels-Alder cycloaddition and acid catalyzed oxazine ring-opening.
- Mudududdla, Ramesh,Jain, Shreyans K.,Bharate, Jaideep B.,Gupta, Ajai P.,Singh, Baldev,Vishwakarma, Ram A.,Bharate, Sandip B.
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p. 8821 - 8827
(2012/11/07)
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- Inhibitory effect of acylphloroglucinol derivatives on the replication of vesicular stomatitis virus.
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The antiviral activity of natural phloroglucinols and of synthesized mono- and diacylphloroglucinols, and 2,6-diacyl-4,4-dialkylcyclohexa-1,3,5-triones was investigated. A correlation between the acyl chain length and inhibitory activity against vesicular stomatitis virus (VSV) was observed. Potent antiviral activity was found in di-isovalerylphoroglucinol. 2,6-Diacyl-4,4-dialkylcyclohexa-1,3,5-triones inhibited replication of the virus with low cytotoxicity.
- Chiba,Takakuwa,Tada,Yoshii
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p. 1769 - 1772
(2007/10/02)
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- Analogues of natural phloroglucinols as antagonists against both thromboxane A2 and leukotriene D4
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Antagonists against both thromboxane A2 and leukotriene D4 were prepared from phloroglucinol. These compounds showed almost the same activity as the chinesins which were isolated from Hypericum chinense L. The correlation between the
- Tada,Chiba,Takakuwa,Kojima
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p. 1209 - 1212
(2007/10/02)
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