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Upadhaya P, Lamenza FF, Shrestha S, Roth P, Jagadeesha S, Pracha H, Horn NA, Oghumu S. Berry Extracts and Their Bioactive Compounds Mitigate LPS and DNFB-Mediated Dendritic Cell Activation and Induction of Antigen Specific T-Cell Effector Responses. Antioxidants (Basel) 2023; 12:1667. [PMID: 37759970 PMCID: PMC10525528 DOI: 10.3390/antiox12091667] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 08/08/2023] [Accepted: 08/22/2023] [Indexed: 09/29/2023] Open
Abstract
Berries have gained widespread recognition for their abundant natural antioxidant, anti-inflammatory, and immunomodulatory properties. However, there has been limited research conducted thus far to investigate the role of the active constituents of berries in alleviating contact hypersensitivity (CHS), the most prevalent occupational dermatological disease. Our study involved an ex vivo investigation aimed at evaluating the impact of black raspberry extract (BRB-E) and various natural compounds found in berries, such as protocatechuic acid (PCA), proanthocyanidins (PANT), ellagic acid (EA), and kaempferol (KMP), on mitigating the pathogenicity of CHS. We examined the efficacy of these natural compounds on the activation of dendritic cells (DCs) triggered by 2,4-dinitrofluorobenzene (DNFB) and lipopolysaccharide (LPS). Specifically, we measured the expression of activation markers CD40, CD80, CD83, and CD86 and the production of proinflammatory cytokines, including Interleukin (IL)-12, IL-6, TNF-α, and IL-10, to gain further insights. Potential mechanisms through which these phytochemicals could alleviate CHS were also investigated by investigating the role of phospho-ERK. Subsequently, DCs were co-cultured with T-cells specific to the OVA323-339 peptide to examine the specific T-cell effector responses resulting from these interactions. Our findings demonstrated that BRB-E, PCA, PANT, and EA, but not KMP, inhibited phosphorylation of ERK in LPS-activated DCs. At higher doses, EA significantly reduced expression of all the activation markers studied in DNFB- and LPS-stimulated DCs. All compounds tested reduced the level of IL-6 in DNFB-stimulated DCs in Flt3L as well as in GM-CSF-derived DCs. However, levels of IL-12 were reduced by all the tested compounds in LPS-stimulated Flt3L-derived BMDCs. PCA, PANT, EA, and KMP inhibited the activated DC-mediated Interferon (IFN)-γ and IL-17 production by T-cells. Interestingly, PANT, EA, and KMP significantly reduced T-cell proliferation and the associated IL-2 production. Our study provides evidence for differential effects of berry extracts and natural compounds on DNFB and LPS-activated DCs revealing potential novel approaches for mitigating CHS.
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Affiliation(s)
- Puja Upadhaya
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA; (P.U.); (F.F.L.); (S.S.); (P.R.); (S.J.); (H.P.); (N.A.H.)
| | - Felipe F. Lamenza
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA; (P.U.); (F.F.L.); (S.S.); (P.R.); (S.J.); (H.P.); (N.A.H.)
- Department of Microbiology, The Ohio State University, Columbus, OH 43210, USA
| | - Suvekshya Shrestha
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA; (P.U.); (F.F.L.); (S.S.); (P.R.); (S.J.); (H.P.); (N.A.H.)
- Department of Microbiology, The Ohio State University, Columbus, OH 43210, USA
| | - Peyton Roth
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA; (P.U.); (F.F.L.); (S.S.); (P.R.); (S.J.); (H.P.); (N.A.H.)
| | - Sushmitha Jagadeesha
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA; (P.U.); (F.F.L.); (S.S.); (P.R.); (S.J.); (H.P.); (N.A.H.)
| | - Hasan Pracha
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA; (P.U.); (F.F.L.); (S.S.); (P.R.); (S.J.); (H.P.); (N.A.H.)
| | - Natalie A. Horn
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA; (P.U.); (F.F.L.); (S.S.); (P.R.); (S.J.); (H.P.); (N.A.H.)
| | - Steve Oghumu
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA; (P.U.); (F.F.L.); (S.S.); (P.R.); (S.J.); (H.P.); (N.A.H.)
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Wang L, Jing L, Zhang Q, Li S, Wang Y, Zhao H. Lead induced thymic immunosuppression in Japanese quail (Coturnix japonica) via oxidative stress-based T cell receptor pathway signaling inhibition. J Inorg Biochem 2022; 235:111950. [DOI: 10.1016/j.jinorgbio.2022.111950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 07/24/2022] [Accepted: 07/26/2022] [Indexed: 11/28/2022]
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Combinations of alkaloids affecting different molecular targets with the saponin digitonin can synergistically enhance trypanocidal activity against Trypanosoma brucei brucei. Antimicrob Agents Chemother 2015; 59:7011-7. [PMID: 26349826 DOI: 10.1128/aac.01315-15] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Accepted: 08/20/2015] [Indexed: 12/18/2022] Open
Abstract
The flagellate Trypanosoma brucei causes sleeping sickness in humans and nagana in animals. Only a few drugs are registered to treat trypanosomiasis, but those drugs show severe side effects. Also, because some pathogen strains have become resistant, new strategies are urgently needed to combat this parasitic disease. An underexplored possibility is the application of combinations of several trypanocidal agents, which may potentiate their trypanocidal activity in a synergistic fashion. In this study, the potential synergism of mutual combinations of bioactive alkaloids and alkaloids with a membrane-active steroidal saponin, digitonin, was explored with regard to their effect on T. b. brucei. Alkaloids were selected that affect different molecular targets: berberine and chelerythrine (intercalation of DNA), piperine (induction of apoptosis), vinblastine (inhibition of microtubule assembly), emetine (intercalation of DNA, inhibition of protein biosynthesis), homoharringtonine (inhibition of protein biosynthesis), and digitonin (membrane permeabilization and uptake facilitation of polar compounds). Most combinations resulted in an enhanced trypanocidal effect. The addition of digitonin significantly stimulated the activity of almost all alkaloids against trypanosomes. The strongest effect was measured in a combination of digitonin with vinblastine. The highest dose reduction indexes (DRI) were measured in the two-drug combination of digitonin or piperine with vinblastine, where the dose of vinblastine could be reduced 9.07-fold or 7.05-fold, respectively. The synergistic effects of mutual combinations of alkaloids and of alkaloids with digitonin present a new avenue to treat trypanosomiasis but one which needs to be corroborated in future animal experiments.
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