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Prueitt RL, Meakin CJ, Drury NL, Goodman JE. Evaluation of neural reflex activation as a potential mode of action for respiratory and cardiovascular effects of fine particulate matter. Inhal Toxicol 2024; 36:125-144. [PMID: 38488087 DOI: 10.1080/08958378.2024.2324033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 02/20/2024] [Indexed: 04/14/2024]
Abstract
OBJECTIVES Mortality from respiratory and cardiovascular health conditions contributes largely to the total mortality that has been associated with exposure to PM2.5 in epidemiology studies. A mode of action (MoA) for these underlying morbidities has not been established, but it has been proposed that some effects of PM2.5 occur through activation of neural reflexes. MATERIALS AND METHODS We critically reviewed the experimental studies of PM2.5 (including ambient PM2.5, diesel exhaust particles, concentrated ambient particles, diesel exhaust, and cigarette smoke) and neural reflex activation, and applied the principles of the International Programme on Chemical Safety (IPCS) MoA/human relevance framework to assess whether they support a biologically plausible and human-relevant MoA by which PM2.5 could contribute to cardiovascular and respiratory causes of death. We also considered whether the evidence from these studies supports a non-threshold MoA that operates at low, human-relevant PM2.5 exposure concentrations. RESULTS AND DISCUSSION We found that the proposed MoA of neural reflex activation is biologically plausible for PM2.5-induced respiratory effects at high exposure levels used in experimental studies, but further studies are needed to fill important data gaps regarding the relevance of this MoA to humans at lower PM2.5 exposure levels. A role for the proposed MoA in PM2.5-induced cardiovascular effects is plausible for some effects but not others. CONCLUSIONS Further studies are needed to determine whether neural reflex activation is the MoA by which PM2.5 could cause either respiratory or cardiovascular morbidities in humans, particularly at the ambient concentrations associated with total mortality in epidemiology studies.
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Drury NL, Mustapha T, Shore RA, Zhao J, Wright GA, Hoffmann AR, Talcott SU, Regan A, Tighe RM, Zhang R, Johnson NM. Maternal exposure to ultrafine particles enhances influenza infection during pregnancy. Part Fibre Toxicol 2023; 20:11. [PMID: 37069680 PMCID: PMC10106898 DOI: 10.1186/s12989-023-00521-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 04/01/2023] [Indexed: 04/19/2023] Open
Abstract
BACKGROUND Interactions between air pollution and infectious agents are increasingly recognized and critical to identify, especially to protect vulnerable populations. Pregnancy represents a vulnerable period for influenza infection and air pollution exposure, yet interactions during pregnancy remain unclear. Maternal exposure to ultrafine particles (UFPs, [Formula: see text] 100 nm diameter), a class of particulate matter ubiquitous in urban environments, elicits unique pulmonary immune responses. We hypothesized that UFP exposure during pregnancy would lead to aberrant immune responses to influenza enhancing infection severity. RESULTS Building from our well-characterized C57Bl/6N mouse model employing daily gestational UFP exposure from gestational day (GD) 0.5-13.5, we carried out a pilot study wherein pregnant dams were subsequently infected with Influenza A/Puerto Rico/8/1934 (PR8) on GD14.5. Findings indicate that PR8 infection caused decreased weight gain in filtered air (FA) and UFP-exposed groups. Co-exposure to UFPs and viral infection led to pronounced elevation in PR8 viral titer and reduced pulmonary inflammation, signifying potential suppression of innate and adaptive immune defenses. Pulmonary expression of the pro-viral factor sphingosine kinase 1 (Sphk1) and pro-inflammatory cytokine interleukin-1β (IL-1 [Formula: see text]) was significantly increased in pregnant mice exposed to UFPs and infected with PR8; expression correlated with higher viral titer. CONCLUSIONS Results from our model provide initial insight into how maternal UFP exposure during pregnancy enhances respiratory viral infection risk. This model is an important first step in establishing future regulatory and clinical strategies for protecting pregnant women exposed to UFPs.
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Affiliation(s)
- Nicholas L Drury
- Department of Environmental and Occupational Health, Texas A&M University, 212 Adriance Lab Rd, 1266 TAMU, College Station, TX, 77843, USA
- Department of Nutrition, Texas A&M University, College Station, TX, 77843, USA
| | - Toriq Mustapha
- Department of Environmental and Occupational Health, Texas A&M University, 212 Adriance Lab Rd, 1266 TAMU, College Station, TX, 77843, USA
| | - Ross A Shore
- Department of Environmental and Occupational Health, Texas A&M University, 212 Adriance Lab Rd, 1266 TAMU, College Station, TX, 77843, USA
| | - Jiayun Zhao
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
| | - Gus A Wright
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX, 77843, USA
| | - Aline Rodrigues Hoffmann
- Department of Comparative, Diagnostic, and Population Medicine, University of Florida, Gainesville, FL, 32653, USA
| | - Susanne U Talcott
- Department of Nutrition, Texas A&M University, College Station, TX, 77843, USA
| | - Annette Regan
- School of Nursing and Health Professions, University of San Francisco, Orange County, CA, 92868, USA
| | - Robert M Tighe
- Department of Medicine, Duke University, Durham, NC, 27710, USA
| | - Renyi Zhang
- Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA
- Department of Atmospheric Sciences, Texas A&M University, College Station, TX, 77843, USA
| | - Natalie M Johnson
- Department of Environmental and Occupational Health, Texas A&M University, 212 Adriance Lab Rd, 1266 TAMU, College Station, TX, 77843, USA.
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Lau CH, Pendleton D, Drury NL, Zhao J, Li Y, Zhang R, Wright GA, Hoffmann AR, Johnson NM. NRF2 Protects against Altered Pulmonary T Cell Differentiation in Neonates Following In Utero Ultrafine Particulate Matter Exposure. Antioxidants (Basel) 2022; 11:202. [PMID: 35204086 PMCID: PMC8868442 DOI: 10.3390/antiox11020202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 01/18/2022] [Accepted: 01/19/2022] [Indexed: 11/18/2022] Open
Abstract
Early life exposure to particulate matter (PM) air pollution negatively impacts neonatal health. The underlying mechanisms following prenatal exposure, particularly to ultrafine particles (UFP, diameter ≤ 0.1 μm), are not fully understood; To evaluate the role of Nrf2 in response to in utero UFP exposure, we exposed time-mated Nrf2-deficient (Nrf2-/-) or wildtype (WT) mice to filtered air (FA) or 100 μg/m3 ultrafine PM daily throughout pregnancy. Offspring were evaluated for pulmonary immunophenotypes and pulmonary/systemic oxidative stress on postnatal day 5, a timepoint at which we previously demonstrated viral respiratory infection susceptibility; Nrf2-/- offspring exposed to FA had significantly lower average body weights compared to FA-exposed WT pups. Moreover, PM-exposed Nrf2-/- offspring weighed significantly less than PM-exposed WT pups. Notably, PM-exposed Nrf2-/- offspring showed a decreased pulmonary Th1/Th2 ratio, indicating a Th2 bias. Th17 cells were increased in FA-exposed Nrf2-/- neonates yet decreased in PM-exposed Nrf2-/- neonates. Analysis of oxidative stress-related genes in lung and oxidative stress biomarkers in liver tissues did not vary significantly across exposure groups or genotypes. Collectively, these findings indicate that the lack of Nrf2 causes growth inhibitory effects in general and in response to gestational UFP exposure. Prenatal UFP exposure skews CD4+ T lymphocyte differentiation toward Th2 in neonates lacking Nrf2, signifying its importance in maternal exposure and infant immune responses.
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Affiliation(s)
- Carmen H. Lau
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX 77843, USA; (C.H.L.); (G.A.W.)
| | - Drew Pendleton
- Department of Environmental and Occupational Health, Texas A&M University, College Station, TX 77843, USA; (D.P.); (N.L.D.)
| | - Nicholas L. Drury
- Department of Environmental and Occupational Health, Texas A&M University, College Station, TX 77843, USA; (D.P.); (N.L.D.)
| | - Jiayun Zhao
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA; (J.Z.); (Y.L.); (R.Z.)
| | - Yixin Li
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA; (J.Z.); (Y.L.); (R.Z.)
| | - Renyi Zhang
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA; (J.Z.); (Y.L.); (R.Z.)
- Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, USA
| | - Gus A. Wright
- Department of Veterinary Pathobiology, Texas A&M University, College Station, TX 77843, USA; (C.H.L.); (G.A.W.)
- Flow Cytometry Facility, Texas A&M University, College Station, TX 77843, USA
| | - Aline Rodrigues Hoffmann
- Department of Comparative, Diagnostic, and Population Medicine, University of Florida, Gainesville, FL 32653, USA;
| | - Natalie M. Johnson
- Department of Environmental and Occupational Health, Texas A&M University, College Station, TX 77843, USA; (D.P.); (N.L.D.)
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Kim H, Castellon-Chicas MJ, Arbizu S, Talcott ST, Drury NL, Smith S, Mertens-Talcott SU. Mango ( Mangifera indica L.) Polyphenols: Anti-Inflammatory Intestinal Microbial Health Benefits, and Associated Mechanisms of Actions. Molecules 2021; 26:2732. [PMID: 34066494 PMCID: PMC8124428 DOI: 10.3390/molecules26092732] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/30/2021] [Accepted: 05/05/2021] [Indexed: 01/05/2023] Open
Abstract
Mango is rich in polyphenols including gallotannins and gallic acid, among others. The bioavailability of mango polyphenols, especially polymeric gallotannins, is largely dependent on the intestinal microbiota, where the generation of absorbable metabolites depends on microbial enzymes. Mango polyphenols can favorably modulate bacteria associated with the production of bioactive gallotannin metabolites including Lactobacillus plantarum, resulting in intestinal health benefits. In several studies, the prebiotic effects of mango polyphenols and dietary fiber, their potential contribution to lower intestinal inflammation and promotion of intestinal integrity have been demonstrated. Additionally, polyphenols occurring in mango have some potential to interact with intestinal and less likely with hepatic enzymes or transporter systems. This review provides an overview of interactions of mango polyphenols with the intestinal microbiome, associated health benefits and underlying mechanisms.
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Affiliation(s)
- Hyemee Kim
- Department of Food Science and Nutrition, Pusan National University, Busan 46241, Korea
| | - Maria Joselyn Castellon-Chicas
- Department of Food Science and Technology, Texas A&M University, College Station, TX 77843, USA; (M.J.C.-C.); (S.A.); (S.T.T.); (N.L.D.); (S.S.)
| | - Shirley Arbizu
- Department of Food Science and Technology, Texas A&M University, College Station, TX 77843, USA; (M.J.C.-C.); (S.A.); (S.T.T.); (N.L.D.); (S.S.)
| | - Stephen T. Talcott
- Department of Food Science and Technology, Texas A&M University, College Station, TX 77843, USA; (M.J.C.-C.); (S.A.); (S.T.T.); (N.L.D.); (S.S.)
| | - Nicholas L. Drury
- Department of Food Science and Technology, Texas A&M University, College Station, TX 77843, USA; (M.J.C.-C.); (S.A.); (S.T.T.); (N.L.D.); (S.S.)
| | - Shayna Smith
- Department of Food Science and Technology, Texas A&M University, College Station, TX 77843, USA; (M.J.C.-C.); (S.A.); (S.T.T.); (N.L.D.); (S.S.)
| | - Susanne U. Mertens-Talcott
- Department of Food Science and Technology, Texas A&M University, College Station, TX 77843, USA; (M.J.C.-C.); (S.A.); (S.T.T.); (N.L.D.); (S.S.)
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Holen I, Drury NL, Hargreaves PG, Croucher PI. Evidence of a role for a non-matrix-type metalloproteinase activity in the shedding of syndecan-1 from human myeloma cells. Br J Haematol 2001; 114:414-21. [PMID: 11529866 DOI: 10.1046/j.1365-2141.2001.02963.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Syndecan-1 is a cell surface proteoglycan that is expressed on human myeloma cells and is thought to act as a co-receptor for certain extracellular matrix proteins and growth factors. The ectodomain of syndecan-1 is thought to be shed from the surface of myeloma cells, although the exact mechanism of release remains unclear. In this study, we used a panel of inhibitors to identify the class of proteinase responsible for shedding the soluble syndecan-1 ectodomain from human myeloma cells. Using enzyme-linked immunosorbent assay, flow cytometry and immunocytochemistry, we demonstrated that myeloma cell lines expressed syndecan-1 on their surface and that this was shed constitutively, but to a varying extent. In addition, phorbol 12-myristate 13-acetate (PMA), an activator of protein kinase C, stimulated a marked loss of cell surface syndecan-1 from each of the cell lines and this was associated with a corresponding increase in soluble syndecan-1. Inhibitors of serine and cysteine proteinases, and matrix-type metalloproteinases, did not inhibit constitutive or PMA-stimulated syndecan-1 shedding from JJN3 and RPMI 8226 cells. However, BB-94, a hydroxamate-based, broad-spectrum, metalloproteinase inhibitor, substantially suppressed constitutive and PMA-stimulated syndecan-1 loss from myeloma cells. These data indicate that a non-matrix-type metalloproteinase is responsible for syndecan-1 shedding from the surface of myeloma cells.
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Affiliation(s)
- I Holen
- Division of Genomic Medicine, University of Sheffield Medical School, Sheffield, UK
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