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Lama O, Roa DA, Arevalo A, Garcia JJ. Additive-free Reductive Hydrodeoxygenation of Fatty Acids Catalyzed by Inexpensive Simple Nickel (II) Compounds. NEW J CHEM 2023. [DOI: 10.1039/d3nj01001e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
The hydrodeoxygenation (HDO) of different fatty acids (FAs) was achieved using simple and commercially available nickel (II) compounds, with silanes as reducing agents under relatively mild reaction conditions. Thus, the...
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Roa DA, Garcia JJ. Hydrosilylation and electroreduction of CO2 using a Zirconocene Hydride Catalyst. NEW J CHEM 2023. [DOI: 10.1039/d2nj06204f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A zirconium-based catalytic system using the commercially available complex [Cp2ZrHCl] (Schwartz reagent) was developed for the hydrosilylation of CO2 to yield methanol via the formation of methoxy-silanes with excellent yields...
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Roa DA, Garcia JJ. Hydrogenation of levulinic acid to γ-valerolactone using a homogeneous titanium catalyst at mild conditions. J Catal 2022. [DOI: 10.1016/j.jcat.2022.08.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Jurado-Vázquez T, Rosaldo E, Arévalo A, Garcia JJ. Levulinic acid hydrogenation with homogeneous Cu(I) catalyst. ChemCatChem 2022. [DOI: 10.1002/cctc.202200628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tamara Jurado-Vázquez
- UNAM Facultad de Quimica: Universidad Nacional Autonoma de Mexico Facultad de Quimica Quimica Inorganica MEXICO
| | - Efrén Rosaldo
- UNAM Facultad de Quimica: Universidad Nacional Autonoma de Mexico Facultad de Quimica Quimica Inorganica MEXICO
| | - Alma Arévalo
- UNAM Facultad de Quimica: Universidad Nacional Autonoma de Mexico Facultad de Quimica Quimica Inorganica MEXICO
| | - Juventino J Garcia
- Universidad Nacional Autonoma de Mexico Facultad de Quimica Circuito InteriorCiudad Universitaria 4510 Mexico City MEXICO
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Lerback JC, Bowen BB, Humphrey CE, Fernandez DP, Bernau JA, Macfarlan SJ, Schniter E, Garcia JJ. Geochemistry and Provenance of Springs in a Baja California Sur Mountain Catchment. Ground Water 2022; 60:295-308. [PMID: 35041214 DOI: 10.1111/gwat.13177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 01/10/2022] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
Fractured rock aquifers cover much of Earth's surface and are important mountain sites for groundwater recharge but are poorly understood. To investigate groundwater systematics of a fractured-dominated aquifer in Baja California Sur, Mexico, we examined the spatial patterns of aquifer recharge and connectivity using the geochemistry of springs. We evaluate a range of geochemical data within the context of two endmember hypotheses describing spatial recharge patterns and fracture connectivity. Hypothesis 1 is that the aquifer system is segmented, and springs are fed by local recharge. Hypothesis 2 is that the aquifer system is well connected, with dominant recharge occurring in the higher elevations. The study site is a small <15 km2 catchment. Thirty-four distinct springs and two wells were identified in the study area, and 24 of these sites were sampled for geochemical analyses along an elevation gradient and canyon transect. These analyses included major ion composition, trace element and strontium isotopes, δ18 O and δ2 H isotopes, radiocarbon, and tritium. δ18 O and δ2 H isotopes suggest that the precipitation feeding the groundwater system has at least two distinct sources. Carbon isotopes showed a change along the canyon transect, suggesting that shorter flowpaths feed springs in the top of the transect, and longer flowpaths discharge near the bottom. Geochemical interpretations support a combination of the two proposed hypotheses. Understanding of the connectivity and provenance of these springs is significant as they are the primary source of water for the communities that inhabit this region and may be impacted by changes in recharge and use.
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Affiliation(s)
- Jory C Lerback
- Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Brenda B Bowen
- Global Change and Sustainability Center, University of Utah, Salt Lake City, UT, 84112, USA
| | - C E Humphrey
- Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, 84112, USA
| | - Diego P Fernandez
- Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, 84112, USA
| | - Jeremiah A Bernau
- Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, 84112, USA
| | - Shane J Macfarlan
- Department of Anthropology, University of Utah, UT, 84112, USA
- Center for Latin American Studies, University of Utah, UT, 84112, USA
| | - Eric Schniter
- Division of Anthropology, California State University, Fullerton, CA, 92831, USA
- Economic Science Institute, Chapman University, CA, 92866, USA
| | - J J Garcia
- Department of Education, Culture, and Society, University of Utah, Salt Lake City, UT, 84112, USA
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Routman DM, Kumar S, Chera BS, Jethwa KR, Van Abel KM, Frechette K, DeWees T, Golafshar M, Garcia JJ, Price DL, Kasperbauer JL, Patel SH, Neben-Wittich MA, Laack NL, Chintakuntlawar AV, Price KA, Liu MC, Foote RL, Moore EJ, Gupta GP, Ma DJ. Detectable Post-operative Circulating Tumor Human Papillomavirus (HPV) DNA And Association with Recurrence in Patients with HPV-Associated Oropharyngeal Squamous Cell Carcinoma. Int J Radiat Oncol Biol Phys 2022; 113:530-538. [PMID: 35157995 DOI: 10.1016/j.ijrobp.2022.02.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 01/22/2022] [Accepted: 02/06/2022] [Indexed: 01/05/2023]
Abstract
PURPOSE To determine the rate of detectability of ctHPVDNA after surgery but before adjuvant therapy in patients with HPV-associated oropharyngeal squamous cell carcinoma (HPV(+)OPSCC) and to investigate whether detectable ctHPVDNA at this time point may be associated with risk of recurrence. METHODS AND MATERIALS Prospectively collected samples from patients with OPSCC were examined in a blinded fashion using a multi-analyte PCR assay. 45 samples were collected from HPV(+)OPSCC patients pre-op (prior to any treatment), and 159 samples post-op (before or at the start of adjuvant RT). Samples were identified via the radiation oncology biobank or via participation in a clinical trial. RT consisted of 60 Gy +/- cisplatin or de-escalation (30 Gy to 36 Gy in 20 b.i.d. fractions + docetaxel). 32 patients had paired samples available pre and post-op for the primary analysis. Additional exploratory analyses including associations of patient and tumor characteristics with recurrence were assessed using Cox proportional hazards models for all 159 post-op samples.. Detectability of ctHPVDNA was compared across groups utilizing logistic regression. Estimates of recurrence free survival (RFS) were made using Kaplan-Meier (KM). RESULTS In a paired analysis of 32 pre and post-op timepoints, 94% of patients had detectable ctHPVDNA pre-op and 41% post-op. RFS at 18 months was 83% (95% CI: 47-95%) for patients with detectable post-op ctHPVDNA compared to 100% for patients with undetectable post-op ctHPVDNA (p=.094).In an exploratory analysis of non-paired post-op samples, ctHPVDNA was detectable in 26% (41 of 159) of patients (median of 22 days post-op). Age (1.06, p=0.025), LVSI (OR 3.17, p=0.011) and ENE (OR=5.67, p=0.001) were associated with detectable ctHPVDNA after surgery. Detectable post-op ctHPVDNA was significantly associated with RFS (p<0.001). CONCLUSION Amongst patients with detectable pre-op ctHPVDNA, a significant proportion have detectable post-op ctHPVDNA in paired post-op samples, collected prior to the initiation of adjuvant radiation therapy. Future prospective study is warranted to investigate the association of detectable post-op ctHPVDNA with recurrence, including in comparison to established clinical and pathologic risk factors.
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Affiliation(s)
- D M Routman
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN, USA.
| | - S Kumar
- Department of Radiation Oncology, University of North Carolina School of Medicine, Chapel Hill, NC, USA; Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA
| | - B S Chera
- Department of Radiation Oncology, University of North Carolina School of Medicine, Chapel Hill, NC, USA; Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA
| | - K R Jethwa
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN, USA; Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT, USA
| | - K M Van Abel
- Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester MN, USA
| | - K Frechette
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN, USA
| | - T DeWees
- Division of Biomedical Statistics and Informatics, Mayo Clinic, Phoenix AZ, USA
| | - M Golafshar
- Division of Biomedical Statistics and Informatics, Mayo Clinic, Phoenix AZ, USA
| | - J J Garcia
- Department of Laboratory Medicine & Pathology, Mayo Clinic, Rochester MN, USA
| | - D L Price
- Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester MN, USA
| | - J L Kasperbauer
- Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester MN, USA
| | - S H Patel
- Department of Radiation Oncology, Mayo Clinic, Phoenix AZ, USA
| | | | - N L Laack
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN, USA
| | | | - K A Price
- Division of Medical Oncology, Mayo Clinic, Rochester MN, USA
| | - M C Liu
- Division of Medical Oncology, Mayo Clinic, Rochester MN, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester MN, USA
| | - R L Foote
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN, USA
| | - E J Moore
- Department of Otolaryngology-Head and Neck Surgery, Mayo Clinic, Rochester MN, USA
| | - G P Gupta
- Department of Radiation Oncology, University of North Carolina School of Medicine, Chapel Hill, NC, USA; Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA
| | - D J Ma
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN, USA
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Robles-Marín E, Flores-Alamo M, Garcia JJ. Electrochemical activation of CO 2 by MOF-(Fe, Ni, Mn) derivatives of 5-aminoisophthalic acid and the thiazole group influence on its catalytic activity. NEW J CHEM 2022. [DOI: 10.1039/d2nj00364c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrocatalysis of carbon dioxide using earth abundant metals and a functionalized MOF to find a sustainable process was investigated.
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Affiliation(s)
- Elvis Robles-Marín
- Facultad de Química, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
| | - Marcos Flores-Alamo
- Facultad de Química, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
| | - Juventino J. Garcia
- Facultad de Química, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
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Roa DA, Garcia JJ. Mild reduction with silanes and reductive amination of levulinic acid using a simple manganese catalyst. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120167] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Flores-Alamo M, Perez-Ortiz FJ, Arevalo A, Garcia JJ. [1,2-Bis(diisopropylphosphanyl)ethane-κ 2
P, P′](2-fluoro- N-{[(2-fluorophenyl)azanidyl]carbonyl}anilinido-κ 2
N, N′)nickel(II). IUCr Data 2020; 5:x200649. [PMID: 36337151 PMCID: PMC9462222 DOI: 10.1107/s2414314620006495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 05/15/2020] [Indexed: 12/03/2022] Open
Abstract
The NiII atom in the title compound shows a distorted square-planar P2N2 coordination set provided by two bidentate ligands. The molecular structure of the title complex, [Ni(C13H8F2N2O)(C14H32P2)] or Ni(oFPU)(dippe), where oFPU is the dianion of bis(2-fluorophenyl)urea and dippe is 1,2-bis(di-isopropylphosphino)ethane, comprises an NiII atom with a distorted square-planar coordination environment (geometry index τ4 = 0.195). One of the fluorophenyl rings of the oFPU ligand is disordered over two sets of sites in an 0.832 (7):0.168 (7) ratio. The crystal structure displays C—H⋯O and C—H⋯F hydrogen-bonding interactions, leading to chains with R22(12) motifs extending parallel to [100]. The title compound might be of interest with respect to the production of urea and carbamate derivatives of nickel(II).![]()
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Saletta JM, Garcia JJ, Caramês JMM, Schliephake H, da Silva Marques DN. Quality assessment of systematic reviews on vertical bone regeneration. Int J Oral Maxillofac Surg 2018; 48:364-372. [PMID: 30139710 DOI: 10.1016/j.ijom.2018.07.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Revised: 06/08/2018] [Accepted: 07/25/2018] [Indexed: 12/14/2022]
Abstract
The aim of this study was to evaluate and compare the quality of systematic reviews of vertical bone regeneration techniques, using two quality-assessment tools (AMSTAR and ROBIS). An electronic literature search was conducted to identify systematic reviews or meta-analyses that would evaluate at least one of the following outcomes: implant survival, success rates, complications or bone gain after vertical ridge augmentation. Methodological quality assessment was performed by two independent evaluators. Results were compared between reviewers, and reliability measures were calculated using the Holsti's method® and Cohen's kappa. Seventeen systematic reviews were included, of which seven presented meta-analysis. Mean ±95% confidence interval AMSTAR score was 6.35 [4.74;7.97], with higher scores being correlated with a smaller risk of bias (Pearson's correlation coefficient=-0.84; P<0.01). Cohen's inter-examiner kappa showed substantial agreement for both checklists. From the available evidence, we ascertained that, regardless of the technique used, it is possible to obtain vertical bone gains. Implant success in regenerated areas was similar to implants placed in pristine bone with results equating between 61.5% and 100% with guided bone regeneration being considered the most predictable technique regarding bone stability, while distraction osteogenesis achieved the biggest bone gains with the highest risk of possible complications.
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Affiliation(s)
- J M Saletta
- Implant Department, Universidad Europea de Madrid, Madrid, Spain
| | - J J Garcia
- Implant Department, Universidad Europea de Madrid, Madrid, Spain; CIRO, Madrid, Spain
| | - J M M Caramês
- Oral Surgery and Implant Department, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal; Implantology Institute, Lisbon, Portugal; LIBPhys-FCT UID/FIS/04559/2013, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal
| | - H Schliephake
- Department of Oral and Maxillofacial Surgery, University Medicine, George-Augusta-University, Göttingen, Germany
| | - D N da Silva Marques
- Implantology Institute, Lisbon, Portugal; LIBPhys-FCT UID/FIS/04559/2013, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal; Centro de Estudos de Medicina Dentária Baseada na Evidência, Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal.
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Gonzalez-Usigli H, Gandarilla A, Garcia JJ, Serrato J, Estrada N. [Cervical ischaemic neuronopathy and cardioembolism: another cause of man-in-the-barrel syndrome]. Rev Neurol 2016; 63:543-546. [PMID: 27897305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
INTRODUCTION Spinal infarction accounts for 1% of all strokes. Cardioembolism is a rare cause. Common areas of ischemic spinal damage are watershed in the dorsal or lumbar regions; however cervical spinal cord infarction has been reported previously. CASE REPORT We present a new case of a man-in-the-barrel syndrome produced by cardiac embolization associated with atrial fibrillation during an acute myocardial infarction, which caused cervical ischemic neuronopathy (infarction of the anterior horn). CONCLUSIONS Classic features of cervical spinal cord ischemia are acute tetraplegia, bladder, bowel and cardiovascular dysfunction and dissociate sensory loss. Incomplete collateralization and anatomical characteristics of the circulation of the anterior spinal artery in the cervical spinal cord, makes of the portion C3 to C5, the most vulnerable portion to ischemic damage, since the radicular arteries supply begins bellow C5 and the pathophysiology of a fast fresh clot lysis produced unique bilateral neuronal horn cells damage.
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Affiliation(s)
- H Gonzalez-Usigli
- Hospital de Especialidades Centro Medico Nacional de Occidente, IMSS, Guadalajara, Mexico
| | - A Gandarilla
- Hospital de Especialidades Centro Medico Nacional de Occidente, IMSS, Guadalajara, Mexico
| | - J J Garcia
- Hospital de Especialidades Centro Medico Nacional de Occidente, IMSS, Guadalajara, Mexico
| | - J Serrato
- Hospital de Especialidades Centro Medico Nacional de Occidente, IMSS, Guadalajara, Mexico
| | - N Estrada
- Hospital de Especialidades Centro Medico Nacional de Occidente, IMSS, Guadalajara, Mexico
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Martínez S, Minguez A, Garcia JJ, Andres M, Goitia V, Martinez C. CP-077 Analysis of costs and prescription guidelines of etanercept and adalimumab in patients of rheumatology, dermatology and gastroenterology services on the pharmacy outpatient unit: Abstract CP-077 Table 1. Eur J Hosp Pharm 2015. [DOI: 10.1136/ejhpharm-2015-000639.73] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Morales-Becerril I, Flores-Alamo M, Garcia JJ. [1,2-Bis(diisopropylphosphanyl)ethane-κ 2P, P′](carbonato-κ 2O, O′)nickel(II). Acta Crystallogr Sect E Struct Rep Online 2013; 69:m200-1. [PMID: 23633999 PMCID: PMC3629481 DOI: 10.1107/s1600536813006521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Accepted: 03/06/2013] [Indexed: 11/10/2022]
Abstract
In the crystal of the title compound, [Ni(CO3)(C14H32P2)], the metal center in each of three independent molecules shows slight tetrahedral distortion from ideal square-planar coordination geometry, with angles between the normals to the planes defined by the cis-P—Ni—P and cis-O—Ni—O fragments of 3.92 (17), 0.70 (16) and 2.17 (14)° in the three molecules. In the crystal, there are intermolecular C—H⋯O hydrogen bonds that show a laminar growth in the ab plane.
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Martinez S, Garcia JJ, Martiarena A, Nogales M, Goitia V, Andres MA, Martinez C. CPC-087 Monitoring Antiemetic Regimens with Aprepitant in Cancer Patients. Eur J Hosp Pharm 2013. [DOI: 10.1136/ejhpharm-2013-000276.544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Garcia JJ, Martin-Cordero L, Hinchado MD, Bote ME, Ortega E. Effects of habitual exercise on the eHsp72-induced release of inflammatory cytokines by macrophages from obese Zucker rats. Int J Sports Med 2012. [PMID: 23180211 DOI: 10.1055/s-0032-1327650] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Regular exercise is a good non-pharmacological treatment of metabolic syndrome in that it improves obesity, diabetes, and inflammation. The 72 kDa extracellular heat shock protein (eHsp72) is released during exercise, thus stimulating the inflammatory responses. The aim of the present work was to evaluate the effect of regular exercise on the eHsp72-induced release of IL-1β, IL-6, and TNFα by macrophages from genetically obese Zucker rats (fa/fa) (ObZ), using lean Zucker (LZ) rats (Fa/fa) to provide reference values. ObZ presented a higher plasma concentration of eHsp72 than LZ, and exercise increased that concentration. In response to eHsp72, the macrophages from ObZ released less IL-1β and TNFα, but more IL-6, than macrophages from LZ. While eHsp72 stimulated the release of IL-1β, TNFα, and IL-6 in the macrophages from healthy LZ (with respect to the constitutive release), it inhibited the release of IL-1β and IL-6 in macrophages from ObZ. The habitual exercise improved the release of inflammatory cytokines by macrophages from ObZ in response to eHsp72 (it increased IL-1β and TNFα, and decreased IL-6), tending to values closer to those determined in healthy LZ. A deregulated macrophage inflammatory and stress response induced by eHsp72 underlies MS, and this is improved by habitual exercise.
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Affiliation(s)
- J J Garcia
- Physiology, University of Extremadura, Badajoz, Spain
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Giraldo E, Martin-Cordero L, Hinchado MD, Garcia JJ, Ortega E. Role of phosphatidylinositol-3-kinase (PI3K), extracellular signal-regulated kinase (ERK) and nuclear transcription factor kappa beta (NF-k beta) on neutrophil phagocytic process of Candida albicans. Mol Cell Biochem 2009; 333:115-20. [PMID: 19609651 DOI: 10.1007/s11010-009-0211-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Accepted: 07/06/2009] [Indexed: 01/21/2023]
Abstract
In humans, Candida albicans is the microorganism most frequently associated with fungal infections. Alterations in the balance between the host and this commensal pathogen, turns into a parasitic relationship which results in the development of invasive infections. Neutrophils via chemotaxis, phagocytosis, and microbicide capacity can eradicate this pathogen. Taken together, the aim of this work was to study the possible role of phosphatidylinositol-3-kinase (PI3K), extracellular signal-regulated kinase (ERK) and the nuclear transcription factor kappa beta (NF-k beta) on the phagocytic process of neutrophils. The chemotactic capacity of neutrophils and their ability to phagocytose and to destroy C. albicans in absence and presence of 1, 10, or 100 microM of wortmannin (a PI3K inhibitor); 10, 25, or 50 microM of Bay 11-7082 (a NF-k beta inhibitor) or 1, 5 or 10 microM of PD 98,059 (an ERK inhibitor) were determined. Our results show that fMLP-induced chemotaxis needs the participation of PI3K and NF-k beta. In contrast, ERK seems not to be involved. On the other hand, the inhibition of NF-kappa beta and ERK decreased neutrophil phagocytosis and microbicide capacity against C. albicans. However, both the phagocytic and candicide capacities were PI3K independent.
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Affiliation(s)
- E Giraldo
- Department of Physiology, Faculty of Sciences, University of Extremadura, 06071, Badajoz, Spain
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Giraldo E, Garcia JJ, Hinchado MD, Ortega E. Exercise intensity-dependent changes in the inflammatory response in sedentary women: role of neuroendocrine parameters in the neutrophil phagocytic process and the pro-/anti-inflammatory cytokine balance. Neuroimmunomodulation 2009; 16:237-44. [PMID: 19365147 DOI: 10.1159/000212384] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Accepted: 10/24/2008] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND It is still not really known what is the optimal level of exercise that improves, but does not impair or overstimulate the innate immune function. This is especially the case in women, who have higher basal levels of 'inflammatory markers' than men. The aim of this work was to evaluate differences in the magnitude of the stimulation of the innate/inflammatory response following a single bout of moderate or intense exercise in sedentary women, all of them in the follicular phase of their menstrual cycle. Changes in stress and sexual hormones were also evaluated. METHODS Changes induced by exercise (45 min at 55% VO(2) max vs. 1 h at 70% VO(2) max on a cycle ergometer) in the phagocytic process (chemotaxis, phagocytosis, and microbicide capacity against Candida albicans) and in serum concentrations of IL-1beta, IL-2, IFN-gamma, IL-12, IL-6, and IL-4 (ELISA) were evaluated. Parallel determinations were also made of serum or plasma concentrations of catecholamines (HPLC) and cortisol, oestradiol, and progesterone (electrochemiluminescence immunoassay). RESULTS Both exercise intensities increased chemotaxis, phagocytosis, and microbicide capacity of the neutrophils. However, the increase in chemotaxis was greater after moderate exercise. All the cytokines assayed were affected by exercise intensity. IFN-gamma increased significantly only immediately after the intense exercise; IL-1beta increased following both exercise intensities, although at 24 h it only remained elevated after the intense exercise; IL-12 only increased 24 h after the intense exercise, and IL-2 only showed a significant decrease following the moderate exercise. IL-6 increased immediately after both exercise intensities, but more so after moderate exercise. While IL-4 (an anti-inflammatory cytokine) increased following the moderate exercise, it decreased after the intense exercise. Both moderate and intense exercise increased norepinephrine and decreased cortisol, both of which returned to basal levels after 24 h. Only the intense exercise affected the epinephrine, oestradiol, and progesterone concentrations, with increases in epinephrine and oestradiol immediately after exercise, and a decrease in progesterone after 24 h. CONCLUSIONS Both moderate and intense exercise stimulate the phagocytic process of neutrophils in sedentary women, but the profile of pro-/anti-inflammatory cytokine release seems to be better following the moderate exercise. The possible participation of stress (catecholamines and cortisol) and sex (oestradiol and progesterone) hormones in these intensity-dependent immune changes is discussed.
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Affiliation(s)
- E Giraldo
- Department of Physiology, Faculty of Sciences, University of Extremadura, Badajoz, Spain
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Sanclemente G, Garcia JJ, Zuleta JJ, Diehl C, Correa C, Falabella R. A double-blind, randomized trial of 0.05% betamethasone vs. topical catalase/dismutase superoxide in vitiligo. J Eur Acad Dermatol Venereol 2008; 22:1359-64. [DOI: 10.1111/j.1468-3083.2008.02839.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Fernandez N, Prieto C, Sierra M, Diez MJ, Sahagun A, Gonzalez A, Garcia JJ. Evolution of the bioavailability and other pharmacokinetic parameters of levodopa (with carbidopa) in rabbits. Methods Find Exp Clin Pharmacol 2008; 30:451-457. [PMID: 18850046 DOI: 10.1358/mf.2008.30.6.1186079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Levodopa pharmacokinetics show important inter- and intraindividual differences when it is administered by the oral route. As a result of fluctuating drug plasma concentrations, patients may develop motor fluctuations and dyskinesias. Therefore, it is important to perform studies on levodopa pharmacokinetics in the same individual. The aim of this study was to contribute to a better knowledge of the evolution of the pharmacokinetics of levodopa administered with carbidopa. The study involved the oral administration of 20/5 mg/kg levodopa/carbidopa to rabbits for two different time periods (7 or 14 days), due to the fact that inhibition of aromatic L-amino-acid decarboxylase by carbidopa is not immediate. After 7 days of treatment, the levodopa AUC increased by 12.6% from day 1 (range: 114.2-150.7 microg.min/ml) to day 7 (range: 131.1-166.0 microg.min/ml) and C(max) increased by 9.6% (range: 1.90-2.86 microg/ml on day 1 and 2.12-3.13 microg/ml on day 7). After 14 days of treatment, the increase in AUC was 17.0% (range: 119.6-160.1 microg.min/ml on day 1 and 142.9-172.7 microg.min/ml on day 14) and C(max) increased by 6.5% (range: 2.29-2.96 microg/ml on day 1 and 2.41-3.07 microg/ml on day 14). The values obtained for C(min) (sample obtained immediately before levodopa/carbidopa administration) in both groups increased progressively with the duration of the treatment. C(max) and AUC values were very similar after 7 or 14 days of treatment. The time needed for C(min) stabilization was slightly higher, because we found significant differences until day 11 of treatment.
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Affiliation(s)
- N Fernandez
- Area de Farmacologia, Universidad de Leon, Leon, Spain.
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Saez MC, Barriga C, Garcia JJ, Rodriguez AB, Masot J, Duran E, Ortega E. Melatonin increases the survival time of animals with untreated mammary tumours: Neuroendocrine stabilization. Mol Cell Biochem 2005; 278:15-20. [PMID: 16180084 DOI: 10.1007/s11010-005-7755-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2004] [Accepted: 12/16/2004] [Indexed: 10/25/2022]
Abstract
The aim of this study was to evaluate the therapeutic effect of melatonin, the main hormone of the pineal gland, on rats with advanced and untreated mammary tumours. Mammary tumours were chemically induced in Sprague-Dawley rats with the carcinogen 9,10-dimethyl-1,2-bezanthracene (DMBA). After the appearance of tumours the effect of melatonin (5 mg/ml per rat per day) was then evaluated on the survival time, tumour multiplicity, and tumour volume until the death of the animals. In addition, the variations in prolactin, noradrenaline and adrenaline concentrations, and in the percentage of NK cells were evaluated after one month of the treatment with melatonin. Daily administration of melatonin increased significantly the survival time of tumour-bearing animals (p<0.05 with respect to the control non-melatonin-receiving rats). The increased survival time did not correlate, however, with changes in either tumour multiplicity or tumour growth rate. Animals with mammary tumours exhibited an increase (p<0.05 with respect to healthy animals) in prolactin and catecholamine concentrations. The administration of melatonin stabilized the hormone levels, returning them to those in the basal-healthy animals. Rats with mammary tumours also presented lower percentages of NK cells, which were not increased by the administration of melatonin. The results strongly suggest that melatonin per se is beneficial during advanced breast cancer. It increases survival time, maybe by improving the homeostatic and neuroendocrine equilibrium which is imbalanced during advanced breast cancer.
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MESH Headings
- 9,10-Dimethyl-1,2-benzanthracene/administration & dosage
- 9,10-Dimethyl-1,2-benzanthracene/pharmacology
- Animals
- Catecholamines/metabolism
- Epinephrine/metabolism
- Female
- Killer Cells, Natural/drug effects
- Killer Cells, Natural/metabolism
- Mammary Neoplasms, Experimental/chemically induced
- Mammary Neoplasms, Experimental/drug therapy
- Mammary Neoplasms, Experimental/metabolism
- Melatonin/administration & dosage
- Melatonin/metabolism
- Melatonin/pharmacology
- Melatonin/therapeutic use
- Prolactin/metabolism
- Rats
- Rats, Sprague-Dawley
- Survival Rate
- Tumor Burden/drug effects
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Affiliation(s)
- M C Saez
- Department of Physiology, Faculty of Science, University of Extremadura, Badajoz, Spain
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Saez MC, Barriga C, Garcia JJ, Rodríguez AB, Ortega E. Effect of the preventive-therapeutic administration of melatonin on mammary tumour-bearing animals. Mol Cell Biochem 2005; 268:25-31. [PMID: 15724434 DOI: 10.1007/s11010-005-2994-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 10/25/2022]
Abstract
Melatonin has been reported to be involved in the feedback between neuroendocrine and immune functions and to exert oncostatic actions. Likewise, this hormone seems to lengthen life span in healthy animals. As of present, most studies have analysed the therapeutic effect of melatonin on cancer growth, but few have tested the preventive effect of melatonin in reducing the risk of cancer. Thus, the aim of this study was to evaluate the preventive-therapeutic effects of melatonin on rats with DMBA-induced mammary tumours, and to examine the effect of melatonin on the first line of cell defence against cancer (macrophages and NK cells) and on some of the neuroendocrine factors that are involved in the development of tumours (prolactin and catecholamines). Melatonin treatment (5 mg/day/animal) began one month prior to DMBA (9,10-dimethyl-1,2-benzanthracene) administration to females Sprague Dawley rats. It was found that the treatment led to an increase in survival and in latency time in the tumour-bearing rats. Although the melatonin treatment did not influence either the phagocytic capacity of macrophages or the number of peripheral blood NK cells, it did stabilise the levels of prolactin by returning the concentrations of this hormone to those of the healthy animals. We conclude that melatonin can exert an oncostatic action, lengthening the survival time of mammary tumour-bearing animals, and suggest that this effect is due, at least in part, to regulating the neuroendocrine parameters of tumour-bearing animals, bringing them closer to their optimal physiological status.
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Affiliation(s)
- M C Saez
- Department of Physiology, Faculty of Science, University of Extremadura, 06071 Badajoz, Spain
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Abstract
The nickel(0) fragment [(dippe)Ni] has been found to react with a variety of aromatic nitriles. Initial pi-coordination to the C=C and Ctbd1;N bonds of 2-cyanoquinoline is found to lead ultimately to C-CN oxidative addition. 3-Cyanoquinoline reacts similarly, although no eta(2)-CN complex is observed. 2-, 3-, And 4-cyanopyridines react initially to give eta(2)-nitrile complexes that then lead to quantitative formation of C-CN oxidative addition products. Benzonitrile reacts similarly but undergoes reversible insertion into the Ph-CN bond to give an equilibrium mixture of Ni(II) and Ni(0) adducts. A series of para-substituted benzonitriles has been studied in terms of both the position of the equilibrium between (dippe)Ni(eta(2)-arylnitrile) right harpoon over left harpoon (dippe)Ni(CN)(aryl) and the rate of approach to equilibrium, and the Hammett plots indicate a buildup of negative charge at the ipso carbon both in the transition state and the Ni(II) product. Terephthalonitrile gives both eta(2)-nitrile and oxidative addition adducts, as well as dimetalated products. No C-C or C-N cleavage of the aromatic ring is seen with quinoline or acridine; only eta(2)-arene complexes are formed. The structures of many of these compounds are supported by X-ray data.
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Affiliation(s)
- Juventino J Garcia
- Contribution from the Facultad de Química, Universidad Nacional Autónoma de México, México, D.F. 04510
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Garcia JJ, Mann BE, Adams H, Bailey NA, Maitlis PM. Equilibria of the Thiametallacycles with Tris(triethylphosphine)platinum(0) and Dibenzothiophene, Benzothiophene, or Thiophene: The Hydrodesulfurization Reaction. J Am Chem Soc 2002. [DOI: 10.1021/ja00113a007] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Saez MC, Garcia JJ, De la Fuente M, Ortega E. Modulation of superoxide anion levels of macrophages from young-adult and old mice by the norepinephrine metabolite, 4-hydroxy-3-methoxyphenyl-glycol. Exp Gerontol 2002; 37:395-400. [PMID: 11772526 DOI: 10.1016/s0531-5565(01)00206-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [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: 10/18/2022]
Abstract
It is well known that a bidirectional relation exists between the immune and the classic animal regulation systems, the nervous and endocrine systems. It has also been reported that ageing has a negative effect on neuro-immuno-endocrine integration. Since it has been shown that norepinephrine (NE) differently modulates the phagocytic process of macrophages from young or old mice, and considering that NE has a short lifetime, the aim of this study is to evaluate the possible immunomodulatory role of the NE end-metabolite, 4-hydroxy-3-methoxyphenyl-glycol (HMP-glycol), on the superoxide anion levels of peritoneal macrophages from young-adult (22+/-2 weeks) and old (72+/-2 weeks) BALB/c mice. Macrophages were incubated with HMP-glycol in a range of concentrations between 10(-12) and 10(-3)M, and superoxide anion levels (both extracellular and intracellular) were evaluated by using the NBT reduction test. The response of macrophages to HMP-glycol was different between young-adult and old animals. While all concentrations (10(-12), 10(-9), 10(-7), 10(-5), 10(-3)M) of HMP-glycol led to lower extracellular O(-)(2) levels (p<0.05) in macrophages from young-adult mice, only the 10(-3)M concentration of HMP-glycol led to a significant decrease in the extracellular O(-)(2) production in macrophages from old mice. No significant changes were found in the intracellular O(2)(-) levels when macrophages were incubated with the different concentrations of HMP-glycol in either young-adult or old mice. Thus, the modulation of macrophage function by NE not only depends on their concentration, but also on the products of NE catabolism. The effect of NE metabolite will also depend on the age of the animals as there is an age-dependent decreased capacity to respond to low concentrations of HMP-glycol.
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Affiliation(s)
- M C Saez
- Departamento de Fisiologia Animal, Facultad de Ciencias, Universidad de Extremadura, Avenida de Elvas s/n, 06071 Badajoz, Spain
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Sierra M, Garcia JJ, Fernández N, Diez MJ, Calle AP, Sahagún AM. Effects of ispaghula husk and guar gum on postprandial glucose and insulin concentrations in healthy subjects. Eur J Clin Nutr 2001; 55:235-43. [PMID: 11360127 DOI: 10.1038/sj.ejcn.1601147] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2000] [Revised: 10/30/2000] [Accepted: 10/31/2000] [Indexed: 11/08/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate, under the same experimental conditions and in the same subjects, the effects of ispaghula husk and guar gum on postprandial glucose and insulin concentrations in healthy female subjects. DESIGN An oral glucose load with and without fiber was administered in the morning after an overnight fast. The study of the fiber effect was planned according to a randomized and cross-over design. SETTING The study was performed at the Department of Pharmacology, Toxicology and Nursing at the University of León (Spain). SUBJECTS Ten healthy female volunteers aged 30-48 y with normal body mass indices participated in this study. RESULTS A significant decrease in mean serum insulin concentrations was observed from 30 to 90 min in the presence of both fibers. The area under the insulin curve was significantly reduced by 36.1% for ispaghula husk and 39.4% for guar gum. The area under the glucose curve was reduced by 11.1% (significant difference) for ispaghula husk and 2.6% for guar gum (no significant difference). CONCLUSIONS According to the results obtained in this study, the administration of ispaghula husk may be beneficial due to its ability to reduce glucose postprandial concentration and especially insulin requirements. Individualization of the treatment would be advisable due to large individual variations observed in glycemic and insulinemic postprandial responses.
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Affiliation(s)
- M Sierra
- Department of Pharmacology, Toxicology and Nursing, University of León, León, Spain.
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Fernández CC, Garcia JJ, Moro BD, Blanco JA, Suárez ML. [Choroidal tubercles in miliary tuberculosis]. Arch Soc Esp Oftalmol 2001; 75:355-8. [PMID: 11151175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
OBJECTIVE/METHOD We present 2 cases of miliary tuberculosis with choroidal tubercles. RESULTS/CONCLUSIONS Miliary tuberculosis is a severe disease that may cause death in case of misdiagnosis, but might be resolved with an adequate mycobacterial therapy. The diagnosis was based on a combínation of findings and the presence of choroidal tubercles may play an important role in the final diagnosis and correct treatment.
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Affiliation(s)
- C C Fernández
- Hospital San Agustín, Avilés, 33012 Oviedo (Asturias), Spain
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28
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Karbownik M, Reiter RJ, Garcia JJ, Cabrera J, Burkhardt S, Osuna C, Lewiński A. Indole-3-propionic acid, a melatonin-related molecule, protects hepatic microsomal membranes from iron-induced oxidative damage: relevance to cancer reduction. J Cell Biochem 2001. [PMID: 11255233 DOI: 10.1002/1097-4644(20010601)81:3<507::aid-jcb1064>3.0.co;2-m] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Excessive free iron and the associated oxidative damage are commonly related to carcinogenesis. Among the antioxidants known to protect against iron-induced oxidative abuse and carcinogenesis, melatonin and other indole compounds recently have received considerable attention. Indole-3-propionic acid (IPA), a deamination product of tryptophan, with a structure similar to that of melatonin, is present in biological fluids and is an effective free radical scavenger. The aim of the study was to examine the effect of IPA on experimentally induced oxidative changes in rat hepatic microsomal membranes. Microsomes were preincubated in presence of IPA (10, 3, 2, 1, 0.3, 0.1, 0.01 or 0.001 mM) and, then, incubated with FeCl(3) (0.2 mM), ADP (1.7 mM) and NADPH (0.2 mM) to induce oxidative damage. Alterations in membrane fluidity (the inverse of membrane rigidity) were estimated by fluorescence spectroscopy and lipid peroxidation by measuring concentrations of malondialdehyde+4-hydroxyalkenals (MDA+4-HDA). IPA, when used in concentrations of 10, 3 or 2 mM, increased membrane fluidity, although at these concentrations it did not influence lipid peroxidation significantly. The decrease in membrane fluidity due to Fe(3+) was completely prevented by preincubation in the presence of IPA at concentrations of 10, 3, 2 or 1 mM. The enhanced lipid peroxidation due to Fe(3+) was prevented by IPA only at the highest concentration (10 mM). It is concluded that Fe(3+)-induced rigidity and, to a lesser extent, lipid peroxidation in microsomal membranes may be reduced by IPA. However, IPA in high concentrations increase membrane fluidity. Besides melatonin, IPA may be used as a pharmacological agent to protect against iron-induced oxidative damage to membranes and, potentially, against carcinogenesis.
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Affiliation(s)
- M Karbownik
- Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, Texas
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Garcia JJ, Li G, Wang P, Zhong J, Granados RR. Primary and continuous midgut cell cultures from Pseudaletia unipuncta (Lepidoptera: Noctuidae). In Vitro Cell Dev Biol Anim 2001; 37:353-9. [PMID: 11515967 DOI: 10.1007/bf02577570] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [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: 10/23/2022]
Abstract
Midgut epithelial cells were isolated from fifth-instar Pseudaletia unipuncta larvae by collagenase treatment of midgut tissue, and cultured in TNM-FH medium. Long-term continuous culture and maintenance of midgut cells were achieved with P. unipuncta armyworm intestinal cells. Several cells lines were obtained from these P. unipuncta primary cultures, and they have been subcultured and maintained for over 24 mo. The three major midgut cell types were present in the cultures, including stem (regenerative), columnar, and goblet cells. In vitro morphogenesis and differentiation of columnar and goblet cells from stem cells were observed. There appeared to be a cycle of cell death of goblet and columnar cells followed by their replacement from stem cells every 7-8 wk. After approximately six passages, the cell density in T-flasks appeared to be somewhat constant, reaching 10(3)-10(4) cells per milliliter of medium. The columnar cells are round to rectangular in shape and possess a brush border, while the goblet cells have a classic flask-like shape with a central cavity. Peritrophic membrane-like secretions were observed in all the culture flasks. Infection of these cells with multiply embedded nucleopolyhedrovirus was confirmed, and we conclude that these midgut cells can be used as an in vitro model system to study early events in baculovirus infection.
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Affiliation(s)
- J J Garcia
- Boyce Thompson Institute for Plant Research, Cornell University. Ithaca, New York 14853, USA
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Ortiz GG, Feria-Velasco A, Falcon-Franco MA, Bitzer-Quintero OK, Garcia JJ, Rosales A, Ruiz-Rizo A, Reiter RJ. Different Patterns in the Histology and Autofluorescence of the Harderian Glands of the Syrian Hamster, Rat, Mouse, Mongolian Gerbil and Guinea Pig. Anat Histol Embryol 2001. [DOI: 10.1046/j.1439-0264.2001.00309.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Karbownik M, Reiter RJ, Cabrera J, Garcia JJ. Comparison of the protective effect of melatonin with other antioxidants in the hamster kidney model of estradiol-induced DNA damage. Mutat Res 2001; 474:87-92. [PMID: 11239965 DOI: 10.1016/s0027-5107(00)00164-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [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: 10/17/2022]
Abstract
17beta-Estradiol (E(2)) is a known carcinogen. Estrogen induction of tumors in hamster kidney is a model of estrogen-related carcinogenesis. Melatonin is a well-known antioxidant, free radical scavenger and oncostatic agent. Changes in the levels of 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodGuo), an index of DNA damage, were measured in kidneys, liver and testes from hamsters treated with E(2) (75mg/kg b.w.) and collected 5h later. Potential protective effects of melatonin, N-acetylserotonin (NAS), indole-3-propionic acid (IPA) and ascorbic acid (AA) against E(2)-induced DNA damage were tested. The antioxidants were applied in equimolar doses of 64.5 micromol/kg b.w., 2 and 0.5h before and 2 and 4h after E(2) treatment. E(2) treatment caused a significant increase in 8-oxodGuo levels in kidneys, but did not influence significantly the oxidation of guanine bases in liver and testes. Melatonin, IPA and AA, but not NAS, completely prevented E(2)-induced DNA damage in hamster kidneys. It is concluded that melatonin, IPA and AA may be effective in protecting against E(2)-related DNA damage and, consequently, carcinogenesis.
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Affiliation(s)
- M Karbownik
- Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA
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Garcia JJ, Ghaly ES. Protein binding of glipizide using equilibrium dialysis technique: effects of hydrogen ion concentration, drug concentration and ionic strength. P R Health Sci J 2001; 20:31-4. [PMID: 11394214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
The objective of this research was to investigate the effects of hydrogen ion concentration, drug concentration and ionic strength on the binding affinity of glipizide to albumin protein. Different buffer solutions of different pH values (pH 6.7, 7.5 and 8.5), different drug concentrations (2.45 mg, 4.82 mg and 9.42 mg), and phosphate buffer solutions pH 7.5 of different ionic strength (0.1, 0.4 and 1.0) were prepared. The effects of pH, drug concentration and ionic strength on the amount of glipizide bounded to 0.25 g bovine albumin was investigated. As the pH of the solution was increased from pH 6.4 to pH 8.5, milligrams drug bounded to gram protein (r value) decreased from 8.2 mg to 3.84 mg/g protein. Also as the ionic strength of the solution was increased from 0.1 to 1.0, the r value decreased from 10.76 mg to 3.96 mg/g protein. However, the r value did not change significantly with increasing of drug from 2.45 mg to 9.42 mg/25 ml. The r value was 7.36 mg/g protein when concentration of the drug was 2.45 mg/25 ml and 7.4 mg/g protein when the concentration of the drug was 9.42 mg/25 ml. This study demonstrated that factors such as high pH and high ionic strength can alter drug-protein binding and consequently increase free drug in plasma and increase bioavailability of slightly water insoluble drug such as antidiabetic drugs.
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Affiliation(s)
- J J Garcia
- School of Pharmacy, University of Puerto Rico, Medical Sciences Campus, San Juan, Puerto Rico 00936-5067
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Karbownik M, Garcia JJ, Lewiński A, Reiter RJ. Carcinogen-induced, free radical-mediated reduction in microsomal membrane fluidity: reversal by indole-3-propionic acid. J Bioenerg Biomembr 2001; 33:73-8. [PMID: 11460928 DOI: 10.1023/a:1005628808688] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [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: 12/15/2022]
Abstract
Chromium (Cr) is a well established carcinogen, with Cr(III) accounting for much of the intracellular oxidative damage that this transition metal induces. Indole-3-propionic acid (IPA), a melatonin-related molecule, is a reported antioxidant and free radical scavenger. Concentration (1, 10, 100, 500, or 1000 microM) and time (15, 30, 45, 60, or 90 min)-dependent effects of Cr(III) in the presence of H2O2 (0.5 mM), as well as the protective effect of IPA on Cr(III)-induced alterations in membrane fluidity (the inverse of membrane rigidity), as an index of membrane damage, were estimated by fluorescence spectroscopy. Cr(III), in a concentration- and a time-dependent manner, decreased membrane fluidity, with marked effects at a concentration of 500 microM and 60 min of incubation. IPA (5, 3, or 1 mM) prevented the Cr(III)-induced decrease in membrane fluidity. It is concluded that the carcinogen Cr(III), in the presence of H202, generates free radicals, which decrease membrane fluidity in rat microsomal membranes. Membrane alterations are pharmacologically prevented by the antioxidant IPA.
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Affiliation(s)
- M Karbownik
- Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, USA
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Micieli MV, Garcia JJ, Andreadis TG. Epizootiological studies of Amblyospora albifasciati (Microsporidiida: Amblyosporidae) in natural populations of Aedes albifasciatus (Diptera: Culicidae) and Mesocyclops annulatus (Copepoda: Cyclopidae) in a transient floodwater habitat. J Invertebr Pathol 2001; 77:68-74. [PMID: 11161996 DOI: 10.1006/jipa.2000.4995] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [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: 11/22/2022]
Abstract
The epizootiology of the microsporidium Amblyospora albifasciati was studied in natural populations of its definitive host, a multivoltine, neotropical, floodwater mosquito, Aedes albifasciatus, and its intermediate copepod host, Mesocyclops annulatus, in an ephemeral floodwater habitat during a 12-month period. A. albifasciati was enzootic in mosquitoes. Vertically (transovarially) transmitted meiospore infections occurred regularly and were detected in five of eight larval broods but the prevalence of infection was always low, ranging from 0.5 to 6.9% with an overall average of 0.7%. Horizontal transmission of A. albifasciati infection from copepods to mosquitoes was nominal and limited. It was detected at levels of 6.4 to 20% in larval Ae. albifasciatus populations on two occasions, the month of August and late September through early October. The low levels of horizontal transmission of infection to mosquito larvae appeared to be the principal limiting factor that prevented the proliferation of A. albifasciati in Ae. albifasciatus populations. Copepod populations were abundant from May through September and weekly prevalence rates of A. albifasciati averaged over 50% (range = 5.8 to 100%). The moderately high infection rates in M. annulatus copepods were inconsistent with the low prevalence of meiospore infection in Ae. albifasciatus mosquito larvae. Results suggest that either meiospores of A. albifasciati produced in the mosquito host are highly infectious to copepods or they are long-lived and remain viable within the pool as long as some standing water is present. Observations further indicate that A. albifasciati has a significant detrimental impact on M. annulatus copepod populations but minimal impact on larval populations of Ae. albifasciatus at this site.
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Affiliation(s)
- M V Micieli
- Comision de Investigaciones Cientificas (CIC), Centro de Estudios Parasitologia y de Vectores (CEPAVE), Calle 2, La Plata, Argentina
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Affiliation(s)
- Juventino J. Garcia
- Facultad de Química, Universidad Nacional Autonoma de Mexico, Mexico, D.F. 04510, Mexico, and Department of Chemistry, University of Rochester, Rochester, New York 14627
| | - William D. Jones
- Facultad de Química, Universidad Nacional Autonoma de Mexico, Mexico, D.F. 04510, Mexico, and Department of Chemistry, University of Rochester, Rochester, New York 14627
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Micieli MV, Garcia JJ, Becnel JJ. Life cycle and description of Amblyospora camposi n. sp. (Microsporidia: Amblyosporidae) in the mosquito Culex renatoi (Diptera, Culicidae) and the copepod Paracyclops fimbriatus fimbriatus (Copepoda, Cyclopidae). J Eukaryot Microbiol 2000; 47:575-80. [PMID: 11128710 DOI: 10.1111/j.1550-7408.2000.tb00092.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [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: 11/28/2022]
Abstract
The life cycle of Amblyospora camposi n. sp. is described from the mosquito Culex renatoi and the copepod Paracyclops fimbriatus fimbriatus collected in the leaf axils of the plant Eryngium cabrerae in Argentina. Meiospores of A. camposi (5.8 x 4.1 microm) were infectious per os to female adults of the copepod P. f. fimbriatus. All developmental stages in the copepod had unpaired nuclei, with sporulation involving the formation of a sub-persistent, sporontogenic, interfacial envelope and the production of a second type of uninucleate spore. These spores, formed in the ovaries of P. f. fimbriatus, were large, pyriform, and measured 10.70 x 3.85 microm. When ingested they infected C. renatoi larvae to initiate a sequence that involves schizogony and gametogony and ends with plasmogamy and nuclear association to form diplokaryotic meronts. Oblong ovate binucleate spores (7.86 x 2.96 microm) are formed in the adult mosquito and are responsible for vertical transmission to the filial generation. This is the first report of an Amblyospora species from a mosquito that inhabits the small-water bodies held in parts of terresterial plants (phytotelmata).
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Karbownik M, Reiter RJ, Garcia JJ, Tan DX, Qi W, Manchester LC. Melatonin reduces rat hepatic macromolecular damage due to oxidative stress caused by delta-aminolevulinic acid. Biochim Biophys Acta 2000; 1523:140-6. [PMID: 11042377 DOI: 10.1016/s0304-4165(00)00110-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Delta-aminolevulinic acid, precursor of heme, accumulates in a number of organs, especially in the liver, of patients with acute intermittent porphyria. The potential protective effect of melatonin against oxidative damage to nuclear DNA and microsomal and mitochondrial membranes in rat liver, caused by delta-aminolevulinic acid, was examined. Changes in 8-hydroxy-2'-deoxyguanosine (8-OHdG) levels, an index of DNA damage, and alterations in membrane fluidity (the inverse of membrane rigidity) and lipid peroxidation in microsomal and mitochondrial membranes, as indices of damage to lipid and protein molecules in membranes, were estimated. Measurements were made in rat liver after a 2 week treatment with delta-aminolevulinic acid (40 mg/kg b.w., every other day). To test the potential protective effects of melatonin, the indole was injected (i.p. 10 mg/kg b.w.) 3 times daily for 2 weeks. 8-OHdG levels and lipid peroxidation in microsomal membranes increased significantly whereas microsomal and mitochondrial membrane fluidity decreased as a consequence of delta-aminolevulinic acid treatment. Melatonin completely counteracted the effects of delta-aminolevulinic acid. Melatonin was highly effective in protecting against oxidative damage to DNA as well as to microsomal and mitochondrial membranes in rat liver and it may be useful as a cotreatment in patients with acute intermittent porphyria.
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Affiliation(s)
- M Karbownik
- Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA
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Karbownik M, Reiter RJ, Garcia JJ, Tan D. Melatonin reduces phenylhydrazine-induced oxidative damage to cellular membranes: evidence for the involvement of iron. Int J Biochem Cell Biol 2000; 32:1045-54. [PMID: 11091137 DOI: 10.1016/s1357-2725(00)00056-x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [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: 10/18/2022]
Abstract
Phenylhydrazine and iron overload result in augmented oxidative damage and an increased likelihood of cancer. Melatonin is a well known antioxidant and free radical scavenger. The aim of this study was to determine whether melatonin would protect against phenylhydrazine-induced oxidative damage to cellular membranes and to evaluate the possible role of iron in this process. Changes in lipid peroxidation and microsomal membrane fluidity were estimated after the treatment of rats with phenylhydrazine (15 mg/kg body weight, daily, 7 days) alone and melatonin or ascorbic acid (15 mg/kg body weight, two times daily, 8 days), or their combination. Additionally, lipid peroxidation was measured in liver homogenates from untreated and melatonin or ascorbic acid-treated rats in vivo and exposed to iron in vitro. Melatonin, but not ascorbic acid, reduced phenylhydrazine-induced lipid peroxidation in vivo in spleen (3.16+/-0.06 vs. 3.83+/-0.12 nmol/mg protein, P<0.05) and plasma (7. 73+/-0.52 vs. 9.96+/-0.71 nmol/ml, P<0.05) and attenuated the decrease in hepatic microsomal membrane fluidity (1/polarization, 3. 068+/-0.007 vs. 3.027+/-0.008, P<0.05). In vitro exposure to iron significantly enhanced the lipid peroxidation in liver homogenates from untreated (3.34+/-0.75 vs. 1.25+/-0.28, P<0.05) or ascorbic acid-treated rats (2.72+/-0.39 vs. 0.88+/-0.06, P<0.05) but not from melatonin-treated rats (1.49+/-0.55 vs. 0.68+/-0.20, NS). It is concluded that free radical mechanisms are involved in the toxicity of phenylhydrazine and that the antioxidant melatonin, but not ascorbic acid, reduces the toxic affects of phenylhydrazine in vivo and of iron in vitro in cell membranes. Therefore, melatonin co-treatment in conditions of iron overload may prove beneficial.
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Affiliation(s)
- M Karbownik
- Department of Cellular and Structural Biology, University of Texas Health Science Center, Mail Code 7762, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA
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Ortega E, Garcia JJ, De La Fuente M. Ageing modulates some aspects of the non-specific immune response of murine macrophages and lymphocytes. Exp Physiol 2000; 85:519-25. [PMID: 11038403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
The deterioration of the immune system with ageing, which leads to an increased morbidity and mortality from infections, appears to be related to decreases in specific lymphocyte functions. However, the alteration of non-specific immunity is a more controversial subject. Our purpose was to investigate the age-related changes of different functions of the non-specific immune response in peritoneal macrophages (adherence to tissues, mobility directed to a chemical gradient from an infectious focus or chemotaxis, phagocytosis of foreign agents and destruction of these agents by superoxide anion production) and in lymphocytes (adherence and chemotaxis) from peritoneum, axillary lymph nodes, spleen and thymus. We used young (12 weeks), adult (22 weeks), mature (48 weeks) and old (72 weeks) female BALB/c mice. The adherence capacity of macrophages and lymphocytes was greater in adult and old mice than in young animals. The chemotaxis of macrophages showed higher values in cells from young mice than in those from adult mice, increasing again in macrophages from mature and old animals. A similar behaviour was shown by phagocytosis, which reached its highest values in old animals. Anion superoxide production increased with age and again the highest values were obtained in the oldest mice. Conversely, chemotaxis of lymphocytes was higher in the adult and mature animals than in the young and old animals. We conclude that, although there is a decrease in lymphocyte chemotaxis in old animals, the non-specific immune response of macrophages instead of decreasing, may increase in aged mice with respect to the values seen in adult mice.
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Affiliation(s)
- E Ortega
- Department of Animal Physiology, Faculty of Science, University of Extremadura, Badajoz, Spain
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Qi W, Reiter RJ, Tan DX, Manchester LC, Siu AW, Garcia JJ. Increased levels of oxidatively damaged DNA induced by chromium(III) and H2O2: protection by melatonin and related molecules. J Pineal Res 2000; 29:54-61. [PMID: 10949541 DOI: 10.1034/j.1600-079x.2000.290108.x] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Chromium (Cr) compounds are known occupational and environmental carcinogens. This trace element is found in the workplace primarily in the valence forms Cr(III) and Cr(VI). Cr(III), which was thought originally to be relatively nontoxic, was recently found to be more reactive toward purified DNA than was chromium(VI). Herein, we examined the ability of Cr(III) to induce oxidative DNA damage by measuring the formation of 8-hydroxydeoxyguanosine (8-OH-dG) in purified calf thymus DNA incubated with CrCl3 plus H2O2. In this system we observed that the Cr(III)-induced formation of 8-OH-dG in isolated DNA was both dose- and time-dependent. When melatonin and related molecules, including 6-methoxy-1,2,3,4-tetrahydro-beta-carboline (pinoline), N-acetylserotonin, 6-hydroxymelatonin and indole-3-propionic acid, were co-incubated with CrCl3 plus H2O2, the accumulations of 8-OH-dG in DNA samples were markedly inhibited in a concentration-dependent manner. The concentrations of each indole required to reduce DNA damage by 50%, i.e. the IC50 values, were 0.48, 0.51, 0.88, 1.00 and 3.08 microM for pinoline, melatonin, N-acetylserotonin, 6-hydroxymelatonin and indole-3-propionic acid, respectively. These results suggest that one of the mechanisms by which Cr(III) may induce cancer is via Fenton-type reactions which generate the hydroxyl radical (*OH). The findings also indicate that the protective effects of melatonin and related molecules against Cr(III)-induced carcinogenesis relate to their direct *OH scavenging ability which thereby reduces the formation of the damaged DNA product, 8-OH-dG.
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Affiliation(s)
- W Qi
- Department of Cellular and Structural Biology, The University of Texas Health Sciences Center, San Antonio 78284-7762, USA
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Karbownik M, Reiter RJ, Qi W, Garcia JJ, Tan DX, Manchester LC. Protective effects of melatonin against oxidation of guanine bases in DNA and decreased microsomal membrane fluidity in rat liver induced by whole body ionizing radiation. Mol Cell Biochem 2000; 211:137-44. [PMID: 11055556 DOI: 10.1023/a:1007148530845] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [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: 11/12/2022]
Abstract
The aim of the study was to examine the potential protective effect of melatonin against whole body ionizing radiation (800 cGy). Changes in 8-hydroxy-2'-deoxyguanosine (8-OH-dG) levels, an index of DNA damage, and alterations in membrane fluidity (the inverse of membrane rigidity) and lipid peroxidation in microsomal membranes, as indices of damage to lipid and protein molecules in membranes, were estimated. Measurements were made in rat liver, 12 h after their exposure to radiation. To test the potential protective effects of melatonin, the indole was injected (i.p. 50 mg/kg b.w.) at 120, 90, 60 and 30 min prior to radiation exposure. Both 8-OH-dG levels and microsomal membrane rigidity increased significantly 12 h after radiation exposure. Melatonin completely counteracted the effects of ionizing radiation. Changes in 8-OH-dG levels and membrane fluidity are early sensitive parameters of DNA and microsomal membrane damage, respectively, induced by ionizing radiation and our findings document the protective effects of melatonin against ionizing radiation.
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Affiliation(s)
- M Karbownik
- Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio 78229-3900, USA
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Qi W, Reiter RJ, Tan DX, Garcia JJ, Manchester LC, Karbownik M, Calvo JR. Chromium(III)-induced 8-hydroxydeoxyguanosine in DNA and its reduction by antioxidants: comparative effects of melatonin, ascorbate, and vitamin E. Environ Health Perspect 2000; 108:399-402. [PMID: 10811565 PMCID: PMC1638051 DOI: 10.1289/ehp.00108399] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Chromium compounds are well documented carcinogens. Cr(III) is more reactive than Cr(VI) toward DNA under in vitro conditions. In the present study, we investigated the ability of Cr(III) to induce oxidative DNA damage by examining the formation of 8-hydroxydeoxyguanosine (8-OH-dG) in calf thymus DNA incubated with CrCl(3) plus H(2)O(2). We measured 8-OH-dG using HPLC with electrochemical detection. In the presence of H(2)O(2), we observed that Cr(III)-induced formation of 8-OH-dG in isolated DNA was dose and time dependent. Melatonin, ascorbate, and vitamin E (Trolox), all of which are free radical scavengers, markedly inhibited the formation of 8-OH-dG in a concentration-dependent manner. The concentration that reduced DNA damage by 50% was 0.51, 30.4, and 36.2 microM for melatonin, ascorbate, and Trolox, respectively. The results show that melatonin is 60- and 70-fold more effective than ascorbate or vitamin E, respectively, in reducing oxidative DNA damage in this in vitro model. These findings also are consistent with the conclusion that the carcinogenic mechanism of Cr(III) is possibly due to Cr(III)-mediated Fenton-type reactions and that melatonin's highly protective effects against Cr(III) relate, at least in part, to its direct hydroxyl radical scavenging ability.
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Affiliation(s)
- W Qi
- Department of Cellular and Structural Biology, The University of Texas Health Science Center, San Antonio, Texas, USA
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Sainz RM, Reiter RJ, Mayo JC, Cabrera J, Tan DX, Qi W, Garcia JJ. Changes in lipid peroxidation during pregnancy and after delivery in rats: effect of pinealectomy. J Reprod Fertil 2000; 119:143-9. [PMID: 10864824 DOI: 10.1530/jrf.0.1190143] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Pregnancy is a physiological state accompanied by a high energy demand of many bodily functions and an increased oxygen requirement. Because of the increased intake and utilization of oxygen, increased levels of oxidative stress would be expected. In the present study, the degree of lipid peroxidation was examined in different tissues from non-pregnant and pregnant rats after the delivery of their young. Melatonin and other indole metabolites are known to be direct free radical scavengers and indirect antioxidants. Thus the effect of pinealectomy at 1 month before pregnancy on the accumulation of lipid damage was investigated in non-pregnant and pregnant rats after the delivery of their young. Malonaldehyde and 4-hydroxyalkenal concentrations were measured in the lung, uterus, liver, brain, kidney, thymus and spleen from intact and pinealectomized pregnant rats soon after birth of their young and at 14 and 21 days after delivery. The same parameters were also evaluated in intact and pinealectomized non-pregnant rats. Shortly after delivery, lipid oxidative damage was increased in lung, uterus, brain, kidney and thymus of the mothers. No differences were detected in liver and spleen. Pinealectomy enhanced this effect in the uterus and lung. It is concluded that during pregnancy high levels of oxidative stress induce an increase in oxidative damage to lipids, which in some cases is inhibited by the antioxidative actions of pineal indoles.
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Affiliation(s)
- R M Sainz
- Department of Cellular and Structural Biology, Mail Code 7762, The University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA
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Sainz RM, Reiter RJ, Mayo JC, Cabrera J, Tan DX, Qi W, Garcia JJ. Changes in lipid peroxidation during pregnancy and after delivery in rats: effect of pinealectomy. Reproduction 2000. [DOI: 10.1530/reprod/119.1.143] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Pregnancy is a physiological state accompanied by a high energy demand of many bodily functions and an increased oxygen requirement. Because of the increased intake and utilization of oxygen, increased levels of oxidative stress would be expected. In the present study, the degree of lipid peroxidation was examined in different tissues from non-pregnant and pregnant rats after the delivery of their young. Melatonin and other indole metabolites are known to be direct free radical scavengers and indirect antioxidants. Thus the effect of pinealectomy at 1 month before pregnancy on the accumulation of lipid damage was investigated in non-pregnant and pregnant rats after the delivery of their young. Malonaldehyde and 4-hydroxyalkenal concentrations were measured in the lung, uterus, liver, brain, kidney, thymus and spleen from intact and pinealectomized pregnant rats soon after birth of their young and at 14 and 21 days after delivery. The same parameters were also evaluated in intact and pinealectomized non-pregnant rats. Shortly after delivery, lipid oxidative damage was increased in lung, uterus, brain, kidney and thymus of the mothers. No differences were detected in liver and spleen. Pinealectomy enhanced this effect in the uterus and lung. It is concluded that during pregnancy high levels of oxidative stress induce an increase in oxidative damage to lipids, which in some cases is inhibited by the antioxidative actions of pineal indoles.
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Garcia JJ, Altiero NJ, Haut RC. Estimation of in situ elastic properties of biphasic cartilage based on a transversely isotropic hypo-elastic model. J Biomech Eng 2000; 122:1-8. [PMID: 10790823 DOI: 10.1115/1.429622] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Articular cartilage is known to behave nonlinearly for large deformations. Mechanical properties derived from small strain experiments yield excessively large deformations in finite element models used in the study of severe blunt impact to joints. In this manuscript, a method is presented to determine the nonlinear elastic properties of biphasic cartilage based on a transversely isotropic hypo-elastic model. The elastic properties were estimated by fitting two force-displacement curves (in rapid loading and at equilibrium) obtained from large deformation indentation relaxation tests on cartilage using a nonporous spherical indentor. The solid skeleton of the cartilage was modeled as a transversely isotropic hypo-elastic material and a commercial finite element program was employed to solve the problem of a layer indented by a rigid sphere. Components of the hypo-elasticity tensor were made dependent on deformation according to the variations defined by a transversely isotropic hyperelastic formulation given earlier by others. Material incompressibility was assumed during the initial stage of rapid loading. The analysis was utilized for the determination of in situ properties of rabbit retropatellar cartilage at large deformations. The model was able to fit the material response to rapid loading and equilibrium indentation test data to approximately 50 percent strain. This material model suggested even higher percentage of stress supported by the fluid phase of cartilage than given earlier by small deformation theories of biphasic cartilage.
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Affiliation(s)
- J J Garcia
- Department of Materials Science and Mechanics, College of Engineering and Orthopaedic, Michigan State University, East Lansing 48824, USA
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Cabrera J, Reiter RJ, Tan DX, Qi W, Sainz RM, Mayo JC, Garcia JJ, Kim SJ, El-Sokkary G. Melatonin reduces oxidative neurotoxicity due to quinolinic acid: in vitro and in vivo findings. Neuropharmacology 2000; 39:507-14. [PMID: 10698016 DOI: 10.1016/s0028-3908(99)00128-8] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.3] [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: 11/23/2022]
Abstract
The in vivo and in vitro effects of melatonin on quinolinic acid-induced oxidative damage in rat brain were determined. The concentrations of malonaldehyde and 4-hydroxyalkenals were assayed as an index of oxidatively damaged lipid. In in vitro experiments, the increase in malonaldehyde and 4-hydroxyalkenals concentrations induced by quinolinic acid were concentration-dependent and time-dependent. The accumulation of products of lipid peroxidation induced by quinolinic acid were very significantly reduced by melatonin in a concentration-dependent manner. Additionally, at the highest concentrations of melatonin used in quinolinic acid treated homogenates, it reduced the levels of oxidatively damaged lipid products below those measured in control homogenates (no quinolinic acid or melatonin). When quinolinic acid (200 mg/kg) was intraperitonally injected into 11-day-old rats, lipid peroxidation in the brain was significantly increased 24 hours later compared to levels in control rats. When melatonin (10 mg/kg) was injected i.p. 30 min before and 4 and 20 hours after the administration of quinolinic acid, the increased lipid peroxidation induced by quinolinic acid was significantly reduced. Likewise, neurobehavioral signs associated with quinolinate administration were attenuated by melatonin. These results show that both in vitro and in vivo pharmacological levels of melatonin confer protection against quinolinic acid-induced oxidative toxicity in the brain. The findings also indicate that melatonin may be pharmacologically useful in combatting quinolinic neurotoxicity which is associated with several acute and chronic neurodegenerative neurological diseases.
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Affiliation(s)
- J Cabrera
- Department of Cellular and Structural Biology, The University of Texas Health Science Center, San Antonio 78284-7762, USA
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Castillo JA, Palomo-Canales J, Garcia JJ, Lastres JL, Bolas F, Torrado JJ. Preparation and characterization of albendazole beta-cyclodextrin complexes. Drug Dev Ind Pharm 1999; 25:1241-8. [PMID: 10612019 DOI: 10.1081/ddc-100102294] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.7] [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: 11/03/2022]
Abstract
Albendazole (ABZ), mebendazole (MBZ), and ricobendazole (RBZ) are low-soluble anthelmintic benzimidazole carbamate drugs. To increase their aqueous solubility, three different types of beta-cyclodextrins (CyDs): beta-cyclodextrin (CD), hydroxypropyl-beta-cyclodextrin (HPCD), and methyl-beta-cyclodextrin (MCD) were used. Solubility depended on the type of CyDs. Increased solubility was obtained when the more substituted CyDs (HPCD or MCD) were used instead of nonsubstituted CD. Stability constants were calculated assuming a 1:1 stoichiometry. Calculated stability constant values depended on initial solubility of drug and pH of the medium. Solid ABZ complexes were prepared by coprecipitation and freeze-drying methods. These products were compared with physical mixtures of ABZ and CyDs. The characterization of these products was made by differential scanning calorimetry (DSC) and drug release studies. True inclusion complexes were obtained only by the freeze-drying method. Drug release studies showed that the freeze-dried inclusion complexes increased the solubility rate of ABZ, although a supersaturation effect was observed when drug release studies were performed in nonsink conditions. A bioavailability study on mice was done with a formulation of ABZ:HPCD complex and was compared to a conventional ABZ suspension. A significantly (p < .05) shorter Tmax of absorption was obtained by using the complex formulation. Greater and significant (p < .05) differences for AUC and Cmax were observed.
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Affiliation(s)
- J A Castillo
- Dpto. de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad Complutense de Madrid, Spain
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Qi W, Reiter RJ, Tan DX, Manchester LC, Kim SJ, Garcia JJ. Inhibitory effects of melatonin on ferric nitrilotriacetate-induced lipid peroxidation and oxidative DNA damage in the rat kidney. Toxicology 1999; 139:81-91. [PMID: 10614689 DOI: 10.1016/s0300-483x(99)00100-6] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [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: 01/18/2023]
Abstract
Ferric nitrilotriacetate (Fe-NTA) is a known complete renal carcinogen which induces lipid peroxidation and oxidative DNA damage in rat kidney. In this study, the in vivo and in vitro effects of melatonin on Fe-NTA-induced lipid and oxidative DNA damage were determined. The levels of malondialdehyde (MDA) and 4-hydroxyalkenals (4-HDA) were assayed as an index of lipid peroxidation and the levels of 8-hydroxydeoxyguanosine (8-OH-dG) as an endpoint of oxidative DNA damage. In in vitro studies, the increased levels of MDA and 4-HDA induced by Fe-NTA were observed to be dose-dependent and time-dependent. The increase in lipid peroxidation was inhibited by melatonin in a concentration-dependent manner. When Fe-NTA(15 mg Fe/kg body weight) was intraperitoneally injected into rats, the levels of MDA + 4-HDA and 8-OH-dG in the rat kidney were increased 1 h after its administration as compared to levels of these constituents in the control group. Pretreatment with melatonin (25 mg/kg or 50 mg/kg) 30 min before the Fe-NTA injection resulted in a significant reduction in the levels of lipid peroxidation and 8-OH-dG induced by Fe-NTA in the rat kidney. These results are consistent with the conclusion that the toxicity of Fe-NTA is due to the generation of reactive oxygen species and that melatonin's protective effects relate to its direct radical scavenging ability and due to other antioxidative processes induced by the indole.
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Affiliation(s)
- W Qi
- Department of Cellular and Structural Biology, The University of Texas Health Science Center, San Antonio 78284-7762, USA
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Ortega E, Forner MA, Garcia JJ, Rodriguez AB, Barriga C. Enhanced chemotaxis of macrophages by strenuous exercise in trained mice: thyroid hormones as possible mediators. Mol Cell Biochem 1999; 201:41-7. [PMID: 10630621 DOI: 10.1023/a:1007020804138] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [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: 11/12/2022]
Abstract
Exercise modulates the macrophage activity via 'stress hormones'. Three experiments were performed. (1) The effect of strenuous exercise performed by trained mice on macrophage chemotactic capacity was evaluated; (2) peritoneal macrophages from control mice were incubated with plasma from exercised mice or control mice and the differences in chemotaxis were measured; (3) changes in plasma T3 and T4 levels after exercise were measured, and the effect of incubation with the post-exercise levels of plasma T3 and T4 on chemotaxis was then studied in vitro. A 10(4)-fold higher concentration of each hormone was also evaluated. Exercise provoked an increase in chemotaxis (104 +/- 35 vs. 47 +/- 11 in controls). Incubation with plasma from exercised mice led to an increased level of chemotaxis. Incubation with concentrations of T3 and T4 similar to those observed in post-exercise plasma (T3, 2.3 nmol l(-1); T4, 84 nmol l(-1)) enhanced chemotaxis with respect to incubation with the basal concentrations of the hormones in control animals. A 10(4)-fold concentration of T4 reversed this effect. It is concluded that thyroid hormones stimulate macrophage chemotaxis. Also, these data support the hypothesis that thyroid hormones may be involved in exercise-induced stimulation of chemotaxis.
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Affiliation(s)
- E Ortega
- Department of Physiology (Animal Physiology), Faculty of Science, University of Extremadura, Badajoz, Spain
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Reiter RJ, Tan D, Kim SJ, Manchester LC, Qi W, Garcia JJ, Cabrera JC, El-Sokkary G, Rouvier-Garay V. Augmentation of indices of oxidative damage in life-long melatonin-deficient rats. Mech Ageing Dev 1999; 110:157-73. [PMID: 10576246 DOI: 10.1016/s0047-6374(99)00058-5] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.0] [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: 12/21/2022]
Abstract
The chief pineal secretory product, melatonin, is an efficient free radical scavenger and antioxidant. The current study tested whether the life-long reduction of endogenous melatonin levels due to pinealectomy would influence the accumulation of oxidatively damaged products as the animals aged. Rats were either pinealectomized or sham operated when they were 2-months-old. At 25 months of age these animals were killed along with 2-month-old controls. Aging in the pineal-intact animals was associated with increased levels of lipid peroxidation products (malondialdehyde and 4-hydroxyalkenals in the lung, kidney and skin), rises in an oxidatively damaged DNA product (8-hydroxy-deoxyguanosine in liver, kidney and pancreas), and in the levels of protein carbonyls (in the liver). Likewise, advanced age was associated with a significant decrease in membrane fluidity (increased membrane rigidity) of hepatic microsomes in pineal-intact rats. For all of these parameters and in a number of organs, pinealectomy caused further increases in the indices of oxidative damage. Consistent with previous suggestions, the implications of these findings is that aging is associated with the augmented accumulation of oxidatively damaged macromolecules and that these increases are exaggerated when a relative melatonin deficiency is induced by pinealectomy. The findings are consistent with the idea that the accelerated accumulation of oxidatively damaged products after pinealectomy was due to reduction in melatonin since it functions as a free radical scavenger and antioxidant. On the other hand, other pineal secretory products that were reduced as a consequence of pineal removal may have also been responsible for some of the observed changes.
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Affiliation(s)
- R J Reiter
- Department of Cellular and Structural Biology, The University of Texas Health Science Center, San Antonio 78284-7762, USA.
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