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  1. Article ; Online: Porphyromonas gingivalis.

    Reyes, Leticia

    Trends in microbiology

    2021  Volume 29, Issue 4, Page(s) 376–377

    MeSH term(s) Bacteroidaceae Infections/complications ; Bacteroidaceae Infections/microbiology ; Gingipain Cysteine Endopeptidases/metabolism ; Humans ; Porphyromonas gingivalis/genetics ; Porphyromonas gingivalis/pathogenicity
    Chemical Substances Gingipain Cysteine Endopeptidases
    Language English
    Publishing date 2021-02-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 1158963-2
    ISSN 1878-4380 ; 0966-842X
    ISSN (online) 1878-4380
    ISSN 0966-842X
    DOI 10.1016/j.tim.2021.01.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Differential affinity chromatography reveals a link between

    Phillips, Priscilla L / Wu, Xiao-Jun / Reyes, Leticia

    Frontiers in cellular and infection microbiology

    2022  Volume 12, Page(s) 983247

    Abstract: Porphyromonas ... ...

    Abstract Porphyromonas gingivalis
    MeSH term(s) Female ; Animals ; Pregnancy ; Rats ; Porphyromonas gingivalis ; Muscle, Smooth, Vascular ; Chromatography, Affinity ; Cell Differentiation
    Language English
    Publishing date 2022-11-22
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2619676-1
    ISSN 2235-2988 ; 2235-2988
    ISSN (online) 2235-2988
    ISSN 2235-2988
    DOI 10.3389/fcimb.2022.983247
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Porphyromonas gingivalis-mediated disruption in spiral artery remodeling is associated with altered uterine NK cell populations and dysregulated IL-18 and Htra1.

    Tavarna, Tanvi / Wolfe, Bryce / Wu, Xiao-Jun / Reyes, Leticia

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 14799

    Abstract: Impaired spiral artery remodeling (IRSA) underpins the great obstetrical syndromes. We previously demonstrated that intrauterine infection with the periodontal pathogen, Porphyromonas gingivalis, induces IRSA in rats. Since our previous studies only ... ...

    Abstract Impaired spiral artery remodeling (IRSA) underpins the great obstetrical syndromes. We previously demonstrated that intrauterine infection with the periodontal pathogen, Porphyromonas gingivalis, induces IRSA in rats. Since our previous studies only examined the end stage of arterial remodeling, the aim of this study was to identify the impact of P. gingivalis infection on the earlier stages of remodeling. Gestation day (GD) 11 specimens, a transition point between trophoblast-independent remodeling and the start of extravillous trophoblast invasion, were compared to late stage GD18 tissues. P. gingivalis was found in decidual stroma of GD11 specimens that already had reduced spiral artery remodeling defined as smaller arterial lumen size, increased retention of vascular smooth muscle, and decreased invasion by extravillous trophoblasts. At GD11, P. gingivalis-induced IRSA coincided with altered uterine natural killer (uNK) cell populations, decreased placental bed expression of interleukin-18 (IL-18) with increased production of temperature requirement A1 (Htra1), a marker of oxidative stress. By GD18, placental bed IL-18 and Htra1 levels, and uNK cell numbers were equivalent in control and infected groups. However, infected GD18 placental bed specimens had decreased TNF + T cells. These results suggest disturbances in placental bed decidual stroma and uNK cells are involved in P. gingivalis-mediated IRSA.
    MeSH term(s) Animals ; Arteries ; Decidua/metabolism ; Female ; High-Temperature Requirement A Serine Peptidase 1/metabolism ; Interleukin-18/metabolism ; Killer Cells, Natural/physiology ; Placenta ; Porphyromonas gingivalis ; Pregnancy ; Rats ; Trophoblasts/metabolism ; Uterine Artery
    Chemical Substances Interleukin-18 ; High-Temperature Requirement A Serine Peptidase 1 (EC 3.4.21.-) ; HtrA1 protein, rat (EC 3.4.21.-)
    Language English
    Publishing date 2022-08-30
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-19239-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: [No title information]

    Ferreira-Guerrero, Elizabeth / Delgado-Sánchez, Guadalupe / Mongua-Rodríguez, Norma / Martínez-Hernández, Maribel / Canizales-Quintero, Sergio / Ferreyra-Reyes, Leticia Dolores / Téllez-Vázquez, Norma Araceli / Cruz-Salgado, Arturo / Ferreyra-Reyes, Leticia Dolores / García-García, Lourdes

    Salud publica de Mexico

    2023  Volume 65, Page(s) s34–s38

    Abstract: Objetivo: Estimar el porcentaje de infección respiratoria aguda (IRA) en menores de cinco años en las últimas dos semanas en México, de acuerdo con los datos de la Encuesta Nacional de Salud y Nutrición Continua 2022 (Ensanut Continua 2022). Material y ... ...

    Title translation Porcentaje de infección respiratoria aguda en menores de cinco años en México. Ensanut Continua 2022.
    Abstract Objetivo: Estimar el porcentaje de infección respiratoria aguda (IRA) en menores de cinco años en las últimas dos semanas en México, de acuerdo con los datos de la Encuesta Nacional de Salud y Nutrición Continua 2022 (Ensanut Continua 2022). Material y métodos. Se analizaron datos de la Ensanut Continua 2022.
    Resultados: El porcentaje de IRA fue de 27.6% (IC95%: 25.2,30.1). La prevalencia fue mayor en el primer tercil socioeconómico (44.1% [IC95%: 38.0,50.4]). El signo de alarma IRA más identificado fue "verse más enfermo" 33.0% (IC95%: 30.1,36.0) y el menos identificado fue "salir pus del oído" (1.5% [IC95%: 0.9,2.7]).
    Conclusiones: Las IRA afectan cerca de una tercera parte de los niños y las niñas menores de cinco años en México, particularmente de los hogares con menores capacidades económicas. Es necesario fortalecer las estrategias de prevención, entre ellas la vacunación, el control y la promoción de la salud.
    Language Spanish
    Publishing date 2023-06-12
    Publishing country Mexico
    Document type English Abstract ; Journal Article
    ZDB-ID 954220-6
    ISSN 1606-7916 ; 0036-3634
    ISSN (online) 1606-7916
    ISSN 0036-3634
    DOI 10.21149/14791
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Hofbauer Cells: Their Role in Healthy and Complicated Pregnancy.

    Reyes, Leticia / Golos, Thaddeus G

    Frontiers in immunology

    2018  Volume 9, Page(s) 2628

    Abstract: Hofbauer cells are placental villous macrophages of fetal origin that are present throughout pregnancy. Although Hofbauer cell populations are antigenically and morphologically heterogeneous, their epigenetic, antigenic, and functional profiles most ... ...

    Abstract Hofbauer cells are placental villous macrophages of fetal origin that are present throughout pregnancy. Although Hofbauer cell populations are antigenically and morphologically heterogeneous, their epigenetic, antigenic, and functional profiles most closely resemble alternatively activated macrophages or what are referred to as M2a, M2b, M2c, and M2d polarity subtypes. Consistent with an M2-like profile, these cells play an important role in placental development including vasculogenesis and angiogenesis. During placental inflammation Hofbauer cells may produce pro-inflammatory cytokines or mediators that damage the villous cell barrier, and induce fibrotic responses within the villi as a continuum of chronic inflammation. However, to date, there is no evidence that Hofbauer cells become classically activated or adopt an M1 polarity phenotype that is able to kill microbes. To the contrary, their predominant M2 like qualities may be why these cells are ineffective in controlling most TORCH infections. Moreover, Hofbauer cells may contribute to vertical transmission of various pathogens to the fetus since they can harbor live virus and serve as reservoirs within the placenta. The goal of this review is to summarize what is currently known about the role of Hofbauer cells in normal and complicated pregnancies that involve immunologic disorders, inflammation, and/or infection.
    MeSH term(s) Animals ; Cytokines/metabolism ; Female ; Humans ; Inflammation/metabolism ; Inflammation/physiopathology ; Macrophages/metabolism ; Macrophages/physiology ; Placenta/metabolism ; Placenta/physiopathology ; Pregnancy ; Pregnancy Complications/metabolism ; Pregnancy Complications/physiopathology
    Chemical Substances Cytokines
    Language English
    Publishing date 2018-11-15
    Publishing country Switzerland
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Review
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2018.02628
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  6. Article ; Online: Nicotine Induces Maternal and Fetal Inflammatory Responses Which Predispose Intrauterine Infection Risk in a Rat Model.

    von Chamier, Maria / Reyes, Leticia / Hayward, Linda F / Brown, Mary B

    Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco

    2021  Volume 23, Issue 10, Page(s) 1763–1770

    Abstract: Introduction: Both smoking and infection adversely impact pregnancy. Previously, our group identified in a rodent model that 6 mg/kg/d nicotine increased the risk of fetal infection at gestation day (GD) 18. Here, we investigate lower nicotine doses.: ...

    Abstract Introduction: Both smoking and infection adversely impact pregnancy. Previously, our group identified in a rodent model that 6 mg/kg/d nicotine increased the risk of fetal infection at gestation day (GD) 18. Here, we investigate lower nicotine doses.
    Methods: Pregnant Sprague-Dawley rats received nicotine infusion at 0, 1, or 3 mg/kg/d (no, low-, and mid-dose nicotine, respectively) from GD 6, with intravenous inoculation with Mycoplasma pulmonis (MP) at 107 CFU (N = 20) or sterile broth (sham) (N = 11) on GD 14. Uterus and fetuses were retrieved on GD 18 for MP culture and histopathologic evaluation of maternal and fetal inflammatory responses (MIR and FIR).
    Results: At 1 mg/kg/d nicotine, MP colonization rates were decreased, from 100% (9 of 9) to 40% (2 of 5) of MP-inoculated dams (p = .03), and 59% (66 of 111) to 39% (24 of 62) of fetuses (p = .01), versus no nicotine. Low-dose nicotine resulted in increased MIR and FIR in the sham-inoculated group; in the MP-inoculated group, this resulted in reduced relative risk (RR) for placental colonization (RR, 95% CI with high MIR = 0.14, 0.02 to 0.65; FIR = 0.38, 0.12 to 0.93). In contrast, 3 mg/kg/d nicotine treatment did not alter colonization rates; furthermore, FIR was completely suppressed, even in the face of placental or amniotic fluid colonization.
    Conclusion: The 1 mg/kg/d nicotine dose decreased risk of intrauterine infection, with increased MIR and FIR. The 3 mg/kg/d nicotine dose inhibited FIR, and increased risk for intrauterine infection. Nicotine alterations of the intrauterine environment were markedly dose-dependent.
    Implications: Nicotine exposure alters intrauterine infection and inflammation in a dose-dependent manner, potentially impacting fetal development and programming. Previous work in a rodent model showed that high-dose nicotine (6 mg/kg/d) exposure exacerbated intrauterine infection during pregnancy. The current study found that low-dose nicotine (1 mg/kg/d) exposure reduced colonization of placenta and amniotic fluid; this decrease was associated with increased intrauterine inflammation. Exposure to mid-dose nicotine (3 mg/kg/d) suppressed fetal inflammation. Elucidation of underlying mechanisms of these phenomena will inform public health and clinical care decisions, particularly in the context of risk assessment of nicotine replacement therapy during pregnancy for smoking cessation.
    MeSH term(s) Amniotic Fluid ; Animals ; Female ; Nicotine/toxicity ; Placenta ; Pregnancy ; Rats ; Rats, Sprague-Dawley ; Smoking Cessation ; Tobacco Use Cessation Devices
    Chemical Substances Nicotine (6M3C89ZY6R)
    Language English
    Publishing date 2021-04-24
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1452315-2
    ISSN 1469-994X ; 1462-2203
    ISSN (online) 1469-994X
    ISSN 1462-2203
    DOI 10.1093/ntr/ntab080
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  7. Article ; Online: PDI inhibitor LTI6426 enhances panobinostat efficacy in preclinical models of multiple myeloma.

    Robinson, Reeder M / Basar, Ashton P / Reyes, Leticia / Duncan, Ravyn M / Li, Hong / Dolloff, Nathan G

    Cancer chemotherapy and pharmacology

    2022  Volume 89, Issue 5, Page(s) 643–653

    Abstract: The histone deacetylase inhibitor (HDACi), panobinostat (Pano), is approved by the United States Food and Drug Administration (FDA) and European Medicines Agency (EMA) for treatment of relapsed/refractory multiple myeloma (MM). Despite regulatory ... ...

    Abstract The histone deacetylase inhibitor (HDACi), panobinostat (Pano), is approved by the United States Food and Drug Administration (FDA) and European Medicines Agency (EMA) for treatment of relapsed/refractory multiple myeloma (MM). Despite regulatory approvals, Pano is used on a limited basis in MM due largely to an unfavorable toxicity profile. The MM treatment landscape continues to evolve, and for Pano to maintain a place in that paradigm it will be necessary to identify treatment regimens that optimize its effectiveness, particularly those that permit dose reductions to eliminate unwanted toxicity. Here, we propose such a regimen by combining Pano with LTI6426, a first-in-class orally bioavailable protein disulfide isomerase (PDI) inhibitor. We show that LTI6426 dramatically enhances the anti-MM activity of Pano in vitro and in vivo using a proteasome inhibitor resistant mouse model of MM and a low dose of Pano that exhibited no signs of toxicity. We go on to characterize a transcriptional program that is induced by the LTI6426/Pano combination, demonstrating a convergence of the two drugs on endoplasmic reticulum (ER) stress pathway effectors ATF3 (Activating Transcription Factor 3), DDIT3/CHOP (DNA Damage Inducible Transcript 3, a.k.a. C/EBP Homologous Protein), and DNAJB1 (DnaJ homolog subfamily B member 1, a.k.a. HSP40). We conclude that LTI6426 may safely enhance low-dose Pano regimens and that ATF3, DDIT3/CHOP, and DNAJB1 are candidate pharmacodynamic biomarkers of response to this novel treatment regimen.
    MeSH term(s) Animals ; HSP40 Heat-Shock Proteins ; Histone Deacetylase Inhibitors/pharmacology ; Histone Deacetylase Inhibitors/therapeutic use ; Humans ; Hydroxamic Acids/pharmacology ; Hydroxamic Acids/therapeutic use ; Mice ; Molecular Targeted Therapy ; Multiple Myeloma/genetics ; Panobinostat/pharmacology ; Protein Disulfide-Isomerases/therapeutic use
    Chemical Substances DNAJB1 protein, human ; HSP40 Heat-Shock Proteins ; Histone Deacetylase Inhibitors ; Hydroxamic Acids ; Panobinostat (9647FM7Y3Z) ; Protein Disulfide-Isomerases (EC 5.3.4.1)
    Language English
    Publishing date 2022-04-05
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 6820-2
    ISSN 1432-0843 ; 0344-5704 ; 0943-9404
    ISSN (online) 1432-0843
    ISSN 0344-5704 ; 0943-9404
    DOI 10.1007/s00280-022-04425-3
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  8. Article: Stimulation of natural killer cells with small molecule inhibitors of CD38 for the treatment of neuroblastoma.

    Mills, Catherine M / Benton, Thomas Z / Piña, Ivett / Francis, Megan J / Reyes, Leticia / Dolloff, Nathan G / Peterson, Yuri K / Woster, Patrick M

    Chemical science

    2023  Volume 14, Issue 8, Page(s) 2168–2182

    Abstract: High-risk neuroblastoma (NB) accounts for 15% of all pediatric cancer deaths. Refractory disease for high-risk NB patients is attributed to chemotherapy resistance and immunotherapy failure. The poor prognosis for high-risk NB patients demonstrates an ... ...

    Abstract High-risk neuroblastoma (NB) accounts for 15% of all pediatric cancer deaths. Refractory disease for high-risk NB patients is attributed to chemotherapy resistance and immunotherapy failure. The poor prognosis for high-risk NB patients demonstrates an unmet medical need for the development of new, more efficacious therapeutics. CD38 is an immunomodulating protein that is expressed constitutively on natural killer (NK) cells and other immune cells in the tumor microenvironment (TME). Furthermore, CD38 over expression is implicated in propagating an immunosuppressive milieu within the TME. Through virtual and physical screening, we have identified drug-like small molecule inhibitors of CD38 with low micromolar IC
    Language English
    Publishing date 2023-01-30
    Publishing country England
    Document type Journal Article
    ZDB-ID 2559110-1
    ISSN 2041-6539 ; 2041-6520
    ISSN (online) 2041-6539
    ISSN 2041-6520
    DOI 10.1039/d2sc05749b
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  9. Article ; Online: Fetal growth restriction is a host specific response to infection with an impaired spiral artery remodeling-inducing strain of Porphyromonas gingivalis.

    Tavarna, Tanvi / Phillips, Priscilla L / Wu, Xiao-Jun / Reyes, Leticia

    Scientific reports

    2020  Volume 10, Issue 1, Page(s) 14606

    Abstract: Porphyromonas gingivalis is a periodontal pathogen implicated in a range of pregnancy disorders that involve impaired spiral artery remodeling (ISAR) with or without fetal growth restriction (FGR). Using a rodent periodontitis model, we assessed the ... ...

    Abstract Porphyromonas gingivalis is a periodontal pathogen implicated in a range of pregnancy disorders that involve impaired spiral artery remodeling (ISAR) with or without fetal growth restriction (FGR). Using a rodent periodontitis model, we assessed the ability of P. gingivalis to produce ISAR and FGR in Sprague Dawley (SD) and Wistar (WIS) rats. Both infected SD and WIS rats developed ISAR, but only WIS rats developed FGR despite both rat strains having equivalent microbial loads within the placenta. Neither maternal systemic inflammation nor placental (fetal) inflammation was a feature of FGR in WIS rats. Unique to infected WIS rats, was loss of trophoblast cell density within the junctional zone of the placenta that was not present in SD tissues. In addition, infected WIS rats had a higher proportion of junctional zone trophoblast cells positive for cytoplasmic high temperature requirement A1 (Htra1), a marker of cellular oxidative stress. Our results show a novel phenomenon present in P. gingivalis-induced FGR, with relevance to human disease since dysregulation of placental Htra1 and placental oxidative stress are features of preeclamptic placentas and preeclampsia with FGR.
    MeSH term(s) Animals ; Arteries/microbiology ; Arteries/pathology ; Bacteroidaceae Infections/complications ; Bacteroidaceae Infections/microbiology ; Female ; Fetal Growth Retardation/etiology ; Fetal Growth Retardation/pathology ; Male ; Porphyromonas gingivalis/pathogenicity ; Pregnancy ; Rats ; Rats, Sprague-Dawley ; Rats, Wistar ; Trophoblasts/microbiology ; Trophoblasts/pathology ; Vascular Remodeling
    Keywords covid19
    Language English
    Publishing date 2020-09-03
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-020-71762-9
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  10. Article ; Online: Mycobacterium tuberculosis lineage 4 associated with cavitations and treatment failure.

    Ordaz-Vázquez, Anabel / Torres-González, Pedro / Ferreyra-Reyes, Leticia / Canizales-Quintero, Sergio / Delgado-Sánchez, Guadalupe / García-García, Lourdes / Ponce-De-León, Alfredo / Sifuentes-Osornio, José / Bobadilla-Del-Valle, Miriam

    BMC infectious diseases

    2023  Volume 23, Issue 1, Page(s) 154

    Abstract: Background: Mycobacterium tuberculosis genotyping has been crucial to determining the distribution and impact of different families on disease clinical presentation. The aim of the study was to evaluate the associations among sociodemographic and ... ...

    Abstract Background: Mycobacterium tuberculosis genotyping has been crucial to determining the distribution and impact of different families on disease clinical presentation. The aim of the study was to evaluate the associations among sociodemographic and clinical characteristics and M. tuberculosis lineages from patients with pulmonary tuberculosis in Orizaba, Veracruz, Mexico.
    Methods: We analyzed data from 755 patients whose isolates were typified by 24-loci mycobacterial interspersed repetitive unit-variable number of tandem repeats (MIRU-VNTR). The associations among patient characteristics and sublineages found were evaluated using logistic regression analysis.
    Results: Among M. tuberculosis isolates, 730/755 (96.6%) were assigned to eight sublineages of lineage 4 (Euro-American). Alcohol consumption (adjusted odds ratio [aOR] 1.528, 95% confidence interval (CI) 1.041-2.243; p = 0.030), diabetes mellitus type 2 (aOR 1.625, 95% CI 1.130-2.337; p = 0.009), sputum smear positivity grade (3+) (aOR 2.198, 95% CI 1.524-3.168; p < 0.001) and LAM sublineage isolates (aOR 1.023, 95% CI 1.023-2.333; p = 0.039) were associated with the presence of cavitations. Resistance to at least one drug (aOR 25.763, 95% CI 7.096-93.543; p < 0.001) and having isolates other than Haarlem and LAM sublineages (aOR 6.740, 95% CI 1.704-26.661; p = 0.007) were associated with treatment failure. In a second model, multidrug resistance was associated with treatment failure (aOR 31.497, 95% CI 5.119-193.815; p < 0.001). Having more than 6 years of formal education was not associated with treatment failure.
    Conclusions: Knowing M. tuberculosis genetic diversity plays an essential role in disease development and outcomes, and could have important implications for guiding treatment and improving tuberculosis control.
    MeSH term(s) Humans ; Mycobacterium tuberculosis/genetics ; Tuberculosis, Pulmonary/microbiology ; Tuberculosis/microbiology ; Minisatellite Repeats ; Phylogeny ; Genotype
    Language English
    Publishing date 2023-03-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 2041550-3
    ISSN 1471-2334 ; 1471-2334
    ISSN (online) 1471-2334
    ISSN 1471-2334
    DOI 10.1186/s12879-023-08055-9
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