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Amaral AT, Ribeiro RM, Santos PHD, Poltronieri TPS, Vivas JMS, Gerhardt IFS, Carvalho BM, Freitas CS, Miranda SB. Genetic variability affecting Exserohilum turcicum resistance in popcorn lines grown under high and low phosphorus conditions. Genet Mol Res 2016; 15:gmr-15-04-gmr.15049399. [PMID: 28002615 DOI: 10.4238/gmr15049399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Northern leaf blight (NLB), caused by Exserohilum turcicum, is one of the main foliar diseases that affect popcorn culture. Farmers use many control measures to minimize damage caused by this disease, among which, the use of cultivars with genetic resistance is the most effective and economical. The aim of this study was to investigate genetic variability influencing resistance to NLB in 25 popcorn maize lines grown under high and low phosphorus conditions in relation to foliar fungal disease caused by E. turcicum. We evaluated the disease incidence and severity, by analysis of variance and cluster test (Scott-Knott). There was sufficient genetic variability between strains for resistance traits. Genotypic variance was higher than environmental variance, and had more discriminatory power. We conclude that new progenies could be selected for the establishment of future populations. P-7, P-9, L-59, L-71, and L-76 progenies possess promising characteristics that simultaneously reduce the severity and the incidence of NLB in popcorn plants.
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Affiliation(s)
- A T Amaral
- Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil
| | - R M Ribeiro
- Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil
| | - P H D Santos
- Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil
| | - T P S Poltronieri
- Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil
| | - J M S Vivas
- Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil
| | - I F S Gerhardt
- Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil
| | - B M Carvalho
- Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil
| | - C S Freitas
- Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil
| | - S B Miranda
- Laboratório de Entomologia e Fitopatologia, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil
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Andrade EL, Bento AF, Cavalli J, Oliveira SK, Schwanke RC, Siqueira JM, Freitas CS, Marcon R, Calixto JB. Non-clinical studies in the process of new drug development - Part II: Good laboratory practice, metabolism, pharmacokinetics, safety and dose translation to clinical studies. Braz J Med Biol Res 2016; 49:e5646. [PMID: 27982281 PMCID: PMC5188860 DOI: 10.1590/1414-431x20165646] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 09/23/2016] [Indexed: 11/22/2022] Open
Abstract
The process of drug development involves non-clinical and clinical studies. Non-clinical studies are conducted using different protocols including animal studies, which mostly follow the Good Laboratory Practice (GLP) regulations. During the early pre-clinical development process, also known as Go/No-Go decision, a drug candidate needs to pass through several steps, such as determination of drug availability (studies on pharmacokinetics), absorption, distribution, metabolism and elimination (ADME) and preliminary studies that aim to investigate the candidate safety including genotoxicity, mutagenicity, safety pharmacology and general toxicology. These preliminary studies generally do not need to comply with GLP regulations. These studies aim at investigating the drug safety to obtain the first information about its tolerability in different systems that are relevant for further decisions. There are, however, other studies that should be performed according to GLP standards and are mandatory for the safe exposure to humans, such as repeated dose toxicity, genotoxicity and safety pharmacology. These studies must be conducted before the Investigational New Drug (IND) application. The package of non-clinical studies should cover all information needed for the safe transposition of drugs from animals to humans, generally based on the non-observed adverse effect level (NOAEL) obtained from general toxicity studies. After IND approval, other GLP experiments for the evaluation of chronic toxicity, reproductive and developmental toxicity, carcinogenicity and genotoxicity, are carried out during the clinical phase of development. However, the necessity of performing such studies depends on the new drug clinical application purpose.
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Affiliation(s)
- E L Andrade
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - A F Bento
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - J Cavalli
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - S K Oliveira
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - R C Schwanke
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - J M Siqueira
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - C S Freitas
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - R Marcon
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - J B Calixto
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
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Andrade EL, Bento AF, Cavalli J, Oliveira SK, Freitas CS, Marcon R, Schwanke RC, Siqueira JM, Calixto JB. Non-clinical studies required for new drug development - Part I: early in silico and in vitro studies, new target discovery and validation, proof of principles and robustness of animal studies. ACTA ACUST UNITED AC 2016; 49:e5644. [PMID: 27783811 PMCID: PMC5089235 DOI: 10.1590/1414-431x20165644] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 09/20/2016] [Indexed: 01/23/2023]
Abstract
This review presents a historical overview of drug discovery and the non-clinical
stages of the drug development process, from initial target identification and
validation, through in silico assays and high throughput screening
(HTS), identification of leader molecules and their optimization, the selection of a
candidate substance for clinical development, and the use of animal models during the
early studies of proof-of-concept (or principle). This report also discusses the
relevance of validated and predictive animal models selection, as well as the correct
use of animal tests concerning the experimental design, execution and interpretation,
which affect the reproducibility, quality and reliability of non-clinical studies
necessary to translate to and support clinical studies. Collectively, improving these
aspects will certainly contribute to the robustness of both scientific publications
and the translation of new substances to clinical development.
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Affiliation(s)
- E L Andrade
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - A F Bento
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - J Cavalli
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - S K Oliveira
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - C S Freitas
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - R Marcon
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - R C Schwanke
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - J M Siqueira
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
| | - J B Calixto
- Centro de Inovação e Ensaios Pré-clínicos, Florianópolis, SC, Brasil
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Freitas CS, Roveda AC, Truzzi DR, Garcia AC, Cunha TM, Cunha FQ, Franco DW. Anti-inflammatory and Anti-nociceptive Activity of Ruthenium Complexes with Isonicotinic and Nicotinic Acids (Niacin) as Ligands. J Med Chem 2015; 58:4439-48. [DOI: 10.1021/acs.jmedchem.5b00133] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cristina S. Freitas
- Departamento de Farmacologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, CEP 14049-900, Ribeirão Preto, SP, Brazil
| | - Antonio C. Roveda
- Instituto de Química de São Carlos, Universidade de São Paulo−USP, P.O. Box 780, CEP 13566-590, São Carlos, SP, Brazil
| | - Daniela R. Truzzi
- Instituto de Química de São Carlos, Universidade de São Paulo−USP, P.O. Box 780, CEP 13566-590, São Carlos, SP, Brazil
| | - André C. Garcia
- Instituto de Química de São Carlos, Universidade de São Paulo−USP, P.O. Box 780, CEP 13566-590, São Carlos, SP, Brazil
| | - Thiago M. Cunha
- Departamento de Farmacologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, CEP 14049-900, Ribeirão Preto, SP, Brazil
| | - Fernando Q. Cunha
- Departamento de Farmacologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, CEP 14049-900, Ribeirão Preto, SP, Brazil
| | - Douglas W. Franco
- Instituto de Química de São Carlos, Universidade de São Paulo−USP, P.O. Box 780, CEP 13566-590, São Carlos, SP, Brazil
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Baggio CH, Freitas CS, Twardowschy A, dos Santosa AC, Mayer B, Potrich FB, Cipriani TR, Sassaki GL, Iacomini M, Marques MCA, Mesia-Velaa S. In vivo/in vitro studies of the effects of the type II arabinogalactan isolated from Maytenus ilicifolia Mart. ex Reissek on the gastrointestinal tract of rats. ACTA ACUST UNITED AC 2012; 67:405-10. [PMID: 23016280 DOI: 10.1515/znc-2012-7-808] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Type II arabinogalactan (AG) is a polysaccharide found in Maytenus ilicifolia (Celastraceae), a plant reputed as gastroprotective. Oral and intraperitoneal administration of the AG protected rats from gastric ulcers induced by ethanol. No alteration of mechanisms related to acid gastric secretion and gastrointestinal motility were observed. In vitro, the AG showed a potent scavenging activity against the radical of DPPH (2,2-diphenyl-1-picrylhydrazyl) with an IC50 value of 9.3 microM. However, the mechanism of the gastroprotective action remains to be identified.
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Affiliation(s)
- Cristiane H Baggio
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, PR, Brazil.
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Baggio CH, Freitas CS, Twardowschy A, Santos ACD, Mayer B, Potrich FB, Cipriani TR, Sassaki GL, Iacomini M, Marques MCA, Mesia-Vela S. In vivo/in vitro Studies of the Effects of the Type II Arabinogalactan Isolated from Maytenus ilicifolia Mart. ex Reissek on the Gastrointestinal Tract of Rats. Z NATURFORSCH C 2012. [DOI: 10.5560/znc.2012.67c0405] [Citation(s) in RCA: 3] [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: 11/24/2022]
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Pereira MI, Ruthes AC, Carbonero ER, Marcon R, Baggio CH, Freitas CS, Santos ARS, Eliasaro S, Sassaki GL, Gorin PAJ, Iacomini M. Chemical structure and selected biological properties of a glucomannan from the lichenized fungus Heterodermia obscurata. Phytochemistry 2010; 71:2132-2139. [PMID: 20947106 DOI: 10.1016/j.phytochem.2010.09.007] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Received: 03/07/2010] [Revised: 08/11/2010] [Accepted: 09/20/2010] [Indexed: 05/30/2023]
Abstract
Successive aqueous and alkaline extraction of the thallus of the lichenized fungus Heterodermia obscurata provided a highly branched glucomannan fraction (GM), whose chemical structure was determined. This was based on monosaccharide composition, methylation, partial acid hydrolysis, and NMR spectroscopic analysis. It consisted of a main chain of (1→6)-linked α-D-mannopyranosyl units, almost all being substituted at O-2 with α-D-glucopyranosyl, α-D-mannopyranosyl, and 4-O-substituted α-D-mannopyranosyl groups. Intra-peritoneal administration of this GM induced a marked and dose-dependent inhibition of acetic acid-induced visceral pain with an ID(50) of 0.6 (0.2-2.0) mg/kg and inhibition of 88±4%. It also reduced leukocyte migration by 58±4%, but did not alter plasmatic extravasation to the peritoneal cavity. The results suggest that the glucomannan from the H. obscurata might have potential for antinociceptive and anti-inflammatory utilization.
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Affiliation(s)
- Maria Izabel Pereira
- Departamento de Farmácia, Faculdade Assis Gurgacz, 85806-090 Cascavel, PR, Brazil
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Komura DL, Carbonero ER, Gracher AHP, Baggio CH, Freitas CS, Marcon R, Santos ARS, Gorin PAJ, Iacomini M. Structure of Agaricus spp. fucogalactans and their anti-inflammatory and antinociceptive properties. Bioresour Technol 2010; 101:6192-6199. [PMID: 20363124 DOI: 10.1016/j.biortech.2010.01.142] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2009] [Revised: 12/18/2009] [Accepted: 01/29/2010] [Indexed: 05/29/2023]
Abstract
Fucogalactans from Agaricus brasiliensis (EPF-Ab) and A. bisporus var. hortensis (EPF-Ah) were prepared via by aqueous extraction and a purification procedure. EPF-Ab had M(w) 19.4 x 10(3)g/mol and EPF-Ah M(w) 31.1 x 10(3)g/mol. EPF-Ab had a (1-->6)-linked alpha-D-Galp main-chain partially substituted in O-2 by non-reducing end-units of alpha-L-Fucp. EPF-Ah had a similar main-chain with O-2 substitution, but was partially methylated at HO-3, as well as having 2.5% non-reducing end-units of beta-D-Gal. In mice, EPF-Ab gave 39% antinociceptive inhibition (ID(50)>100mg/kg) and no anti-inflammatory activity. EPF-Ah also gave an inhibition of 39% at ID(50) 0.33 mg/kg and also inhibited by 61% (ID(50) 5.0mg/kg) total cell migration and by 32% peritoneal capillary permeability, which is related to the anti-inflammatory effect. The small differences in chemical structure in these polysaccharides thus modified their biological activities.
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Affiliation(s)
- Dirce L Komura
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, Curitiba 81531-980, Brazil
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Lancaster JL, Rainey LH, Summerlin JL, Freitas CS, Fox PT, Evans AC, Toga AW, Mazziotta JC. Automated labeling of the human brain: a preliminary report on the development and evaluation of a forward-transform method. Hum Brain Mapp 2010; 5:238-42. [PMID: 20408222 DOI: 10.1002/(sici)1097-0193(1997)5:4<238::aid-hbm6>3.0.co;2-4] [Citation(s) in RCA: 550] [Impact Index Per Article: 39.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
A forward-transform method for retrieving brain labels from the 1988 Talairach Atlas using x-y-z coordinates is presented. A hierarchical volume-occupancy labeling scheme was created to simplify the organization of atlas labels using volume and subvolumetric components. Segmentation rules were developed to define boundaries that were not given explicitly in the atlas. The labeling scheme and segmentation rules guided the segmentation and labeling of 160 contiguous regions within the atlas. A unique three-dimensional (3-D) database label server called the Talairach Daemon (http://ric.uthscsa.edu/projects) was developed for serving labels keyed to the Talairach coordinate system. Given an x-y-z Talairach coordinate, a corresponding hierarchical listing of labels is returned by the server. The accuracy and precision of the forward-transform labeling method is now under evaluation.
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Affiliation(s)
- J L Lancaster
- Research Imaging Center, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78284-6240, USA
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Lancaster JL, Rainey LH, Summerlin JL, Freitas CS, Fox PT, Evans AC, Toga AW, Mazziotta JC. Automated labeling of the human brain: a preliminary report on the development and evaluation of a forward-transform method. Hum Brain Mapp 2010. [PMID: 20408222 DOI: 10.1002/(sici)1097-0193(1997)5:4<238::aid-hbm6>3.0.co;2-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
A forward-transform method for retrieving brain labels from the 1988 Talairach Atlas using x-y-z coordinates is presented. A hierarchical volume-occupancy labeling scheme was created to simplify the organization of atlas labels using volume and subvolumetric components. Segmentation rules were developed to define boundaries that were not given explicitly in the atlas. The labeling scheme and segmentation rules guided the segmentation and labeling of 160 contiguous regions within the atlas. A unique three-dimensional (3-D) database label server called the Talairach Daemon (http://ric.uthscsa.edu/projects) was developed for serving labels keyed to the Talairach coordinate system. Given an x-y-z Talairach coordinate, a corresponding hierarchical listing of labels is returned by the server. The accuracy and precision of the forward-transform labeling method is now under evaluation.
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Affiliation(s)
- J L Lancaster
- Research Imaging Center, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78284-6240, USA
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Freitas CS, Baggio CH, Finau J, Anginoni M, Pizzolatti MG, Santos ARS, Marques MCA. Inhibition of H+/K+ ATPase in the gastroprotective effect of Baccharis illinita DC. J Pharm Pharmacol 2010; 60:1105-10. [DOI: 10.1211/jpp.60.8.0017] [Citation(s) in RCA: 10] [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: 12/16/2022]
Abstract
Abstract
Baccharis illinita DC (Compositae) is used in folk medicine to treat gastric disturbances. Preliminary studies with other extracts of B. Illinita showed gastric protection against ethanol-, indometacin- and stress-induced ulcers and the inhibition of gastric secretion. Based on these data, the aim of this study was to verify the pathways involved in the inhibition of gastric secretion. The chloroform extract (CE) of flowers from B. illinita (3, 10, 30 and 100 mg kg−1 i.p.) tested on rats with pylorus ligature reduced the volume and the total acidity of gastric content by approximately 50% (ED50 = 69 mg kg−1). Treatment with CE (100 mg kg−1 i.p.) reduced the gastric total acidity stimulated by histamine, bethanechol and pentagastrin to 42%, 27% and 57% of that in the stimulated control group, respectively. The CE (10, 30 and 100 μM) inhibited H+/K+ ATPase activity in-vitro, with an IC50 of 37 μM. The isolated flavonoid luteolin (1, 3, 10 and 30 μM) also inhibited H+/K+ ATPase activity by 50%, at a dose of 30 μM. Our results suggest that the reduction in gastric secretion occurs through inhibition of H+/K+ ATPase, which is the final step in acid secretion and therefore one of the most important steps.
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Affiliation(s)
- Cristina S Freitas
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, 81531-990, PR, Brazil
| | - Cristiane H Baggio
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, 81531-990, PR, Brazil
| | - Jaqueline Finau
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, 81531-990, PR, Brazil
| | - Margano Anginoni
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, 81531-990, PR, Brazil
| | - Moacir G Pizzolatti
- Department of Chemistry, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | - Adair R S Santos
- Department of Physiological Sciences, Centre of Biological Sciences, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | - Maria C A Marques
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, 81531-990, PR, Brazil
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dos Santos AC, Baggio CH, Freitas CS, Lepieszynski J, Mayer B, Twardowschy A, Missau FC, dos Santos ÉP, Pizzolatti MG, Marques MCA. Gastroprotective activity of the chloroform extract of the roots from Arctium lappa L. J Pharm Pharmacol 2010; 60:795-801. [DOI: 10.1211/jpp.60.6.0016] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
Arctium lappa L. is used in folk medicine as a diuretic, depurative and digestive stimulant and in dermatological conditions. The objective of this study was to evaluate the effect and the possible mechanisms involved in the gastroprotective effects of a chloroform extract (CE) of the roots from A. lappa and its fractions. Oral pretreatment with CE (10, 30 and 100 mgkg−1) significantly reduced gastric lesions induced by ethanol by 61%, 70% and 76%, respectively. Oral administration of CE (100 mgkg−1 per day for 7 days) reduced the chronic gastric ulceration induced by acetic acid by 52%. Intraduodenal CE (100, 300 and 600 mgkg−1) reduced the total acidity of gastric secretion by 22%, 22% and 33%, respectively, while i.p. administration (10, 30 and 100 mgkg−1) inhibited total acidity by 50%, 60% and 67%, respectively. In-vitro, CE inhibited H+, K+-ATPase activity with an EC50 of 53 μgmL−1 and fraction A (30 and 100 μgmL−1) reduced this by 48% and 89%, respectively. CE had no effect on gastrointestinal motility. CE (250 μgmL−1) and fraction B (100 and 250 μgmL−1) had free-radical scavenging ability, inhibiting 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical activity by 50%, 20% and 55%, respectively. Collectively, the results show that the CE protects animals from gastric lesions by reducing gastric acid secretion via inhibition of gastric H+, K+-ATPase.
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Affiliation(s)
- Ana C dos Santos
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Cristiane H Baggio
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Cristina S Freitas
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Juliana Lepieszynski
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Bárbara Mayer
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - André Twardowschy
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Fabiana C Missau
- Department of Chemistry, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Élide P dos Santos
- Department of Botany, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, PR, Brazil
| | - Moacir G Pizzolatti
- Department of Chemistry, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Maria C A Marques
- Department of Pharmacology, Sector of Biological Sciences, Universidade Federal do Paraná, Curitiba, PR, Brazil
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Cipriani TR, Mellinger CG, de Souza LM, Baggio CH, Freitas CS, Marques MCA, Gorin PA, Sassaki GL, Iacomini M. Polygalacturonic acid: Another anti-ulcer polysaccharide from the medicinal plant Maytenus ilicifolia. Carbohydr Polym 2009. [DOI: 10.1016/j.carbpol.2009.03.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Cipriani TR, Mellinger CG, Bertolini ML, Baggio CH, Freitas CS, Marques MCA, Gorin PA, Sassaki GL, Iacomini M. Gastroprotective effect of a type I arabinogalactan from soybean meal. Food Chem 2009. [DOI: 10.1016/j.foodchem.2008.12.017] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [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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Smiderle FR, Olsen LM, Carbonero ER, Baggio CH, Freitas CS, Marcon R, Santos AR, Gorin PA, Iacomini M. Anti-inflammatory and analgesic properties in a rodent model of a (1→3),(1→6)-linked β-glucan isolated from Pleurotus pulmonarius. Eur J Pharmacol 2008; 597:86-91. [DOI: 10.1016/j.ejphar.2008.08.028] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2008] [Revised: 08/18/2008] [Accepted: 08/21/2008] [Indexed: 11/27/2022]
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16
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Smiderle FR, Olsen LM, Carbonero ER, Marcon R, Baggio CH, Freitas CS, Santos ARS, Torri G, Gorin PAJ, Iacomini M. A 3-O-methylated mannogalactan from Pleurotus pulmonarius: structure and antinociceptive effect. Phytochemistry 2008; 69:2731-2736. [PMID: 18834999 DOI: 10.1016/j.phytochem.2008.08.006] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2008] [Revised: 06/13/2008] [Accepted: 08/11/2008] [Indexed: 05/26/2023]
Abstract
A polysaccharide (Mw 2.39x10(4)g/mol) was extracted with cold water from the basidiomycete Pleurotus pulmonarius, and its antinociceptive and anti-inflammatory properties were evaluated. It was a mannogalactan (MG), whose structure was characterized using mono- and two-dimensional NMR spectroscopy, methylation analysis, and a controlled Smith degradation. It had a main chain of (1-->6)-linked alpha-D-galactopyranosyl and 3-O-methyl-alpha-D-galactopyranosyl units, both of which are partially substituted at O-2 by beta-D-mannopyranosyl non-reducing ends. The MG was tested for its effects on the acetic acid-induced writhing reaction in mice, a typical model for inflammatory pain, causing a marked and dose-dependent inhibition of the nociceptive response, with ID50 of 16.2 (14.7-17.7)mg/kg and inhibition of 93+/-3% at a dose of 30mg/kg. An inflammatory response was not inhibited.
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Affiliation(s)
- F R Smiderle
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, CP 19046, 81531-980 Curitiba PR, Brazil
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17
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Cipriani TR, Mellinger CG, de Souza LM, Baggio CH, Freitas CS, Marques MC, Gorin PA, Sassaki GL, Iacomini M. Acidic heteroxylans from medicinal plants and their anti-ulcer activity. Carbohydr Polym 2008. [DOI: 10.1016/j.carbpol.2008.02.012] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Cosmo SA, Mayer B, Freitas CS, Baggio CH, Marques MCA. Gastroprotective effect of hydroalcoholic extract from barks of Persea major Kopp (Lauraceae) in rats. Rev bras farmacogn 2007. [DOI: 10.1590/s0102-695x2007000400010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Cipriani TR, Mellinger CG, de Souza LM, Baggio CH, Freitas CS, Marques MCA, Gorin PAJ, Sassaki GL, Iacomini M. A polysaccharide from a tea (infusion) of Maytenus ilicifolia leaves with anti-ulcer protective effects. J Nat Prod 2006; 69:1018-21. [PMID: 16872136 DOI: 10.1021/np060045z] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Maytenus ilicifolia is a medicinal plant used as a tea (infusion) for treatment of stomach ulcers. This tea furnished a polysaccharide after several purification steps, consisting of a freezing-thawing process, Fehling precipitation, ultrafiltration, and dialysis. It consisted of arabinose, galactose, galacturonic acid, 4-O-methylglucuronic acid, rhamnose, and glucose in a 42:41:6:5:4:2 molar ratio. Methylation analysis, controlled Smith degradation, and NMR spectroscopy indicated that it was a type II arabinogalactan containing a (1-->3)-linked beta-d-Galp main chain, substituted at O-6 by (1-->6)-linked beta-d-Galp chains, which were mainly substituted at O-3 by (1-->5)- and (1-->3)-linked alpha-l-Araf chains, and nonreducing end-units of alpha-l-Araf and 4-O-Me-GlcpA. This polysaccharide significantly inhibited ethanol-induced gastric lesions in rats with an ED(50) of 9.3 mg/kg, suggesting that the arabinogalactan liberated from the infusion has a protective anti-ulcer effect.
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Affiliation(s)
- Thales R Cipriani
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, CP-19046, CEP-81531-990, Curitiba, PR, Brazil
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20
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Domingues ZR, Cortés ME, Gomes TA, Diniz HF, Freitas CS, Gomes JB, Faria AMC, Sinisterra RD. Bioactive glass as a drug delivery system of tetracycline and tetracycline associated with β-cyclodextrin. Biomaterials 2004; 25:327-33. [PMID: 14585720 DOI: 10.1016/s0142-9612(03)00524-6] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The aim of this study was to evaluate the physical-chemical properties, in vivo biocompatibility and antimicrobial activity of bioactive glasses (BG) used as a controlled release device for tetracycline hydrochloride and an inclusion complex formed by tetracycline and beta-cyclodextrin at 1:1 molar ratio. The BG as well as their compounds loaded with tetracycline (BT) and tetracycline:beta-cyclodextrin (BTC) were characterized by FTIR spectroscopy, X-ray powder diffraction, differential scanning calorimetry and by scanning electron microscopy and energy dispersive spectroscopy. The in vivo test was carried out with female mice split into three groups treated with bioactive glass either without drugs, or associated with tetracycline, or with tetracycline:beta-cyclodextrin by subcutaneous implantation. The histological examination of tissue at the site of implantation showed moderate inflammatory reactions in all groups after 72 h. The bacterial effect was tested on A. actinomycetemcomitans suspended in BHI broth, with or without bioactive particles. A considerable bacteriostatic activity was found with BT and BTC glasses, as compared to plain glass. The presence of cyclodextrin was important to slow down the release of tetracycline for a long period of time and it was verified that the presence of tetracycline or its inclusion complex, tetracycline:beta-cyclodextrin, did not affect the bioactivity of the glass.
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Affiliation(s)
- Z R Domingues
- Departamento de Qui;mica, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627 CEP Belo Horizonte 31270-901, Brazil
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21
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Dalmau SR, Freitas CS, Savino W. The "early' CD4+CD8+ stage of thymocte differentiation hallmarks the end of a strong positive correlation between extracellular matrix receptor expression and protein tyrosine phosphorylation. Cell Mol Biol (Noisy-le-grand) 2001; 47:75-86. [PMID: 11292262] [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: 02/19/2023]
Abstract
We used irradiation-induced thymic regression/reconstitution to study phosphotyrosine (PTyr) levels and expression of extracellular matrix receptors in thymocyte subsets by flow cytometry. High PTyr levels (PTyr(hi)) characterized cells from the CD4-CD8-(DN)CD25in/hi to the "early" CD4-CD8+(DP)CD25- stage. Correlation indexes (R) between the percentages of these PTyrhi cells and cells with up-regulated expression of alpha4 integrin (alpha4hi) were strongly positive (R= 0.91, P= 0.002, for DN; R= 0.98, P= 0.0001 for DP). At the "early" DP stage, R between PTyrhi cells and cells with up-regulated expression of alpha5 integrin and L-selectin (alpha5hi and L-sel(hi)) also rendered strongly positive (R>0.95, p<0.0003). "Late" expanding DP cells exhibited intermediate PTyr levels (PTyr(in)), associated with a down-regulation of the adhesion receptors assessed. Triple-labeling suggested that in most early CD3-/lo cells, alpha4hi and alpha5hi, but not L-sel(hi) expression preceded a PTyr(hi) content. CD3in/hi-enriched CD8+ cells were also PTyr(hi), but conversely to the immature ones exhibited a tendency for a negative R between PTyr(hi) and alpha4hi (R = -0.93, P = 0.067, n= 4) or alpha5hi cells (R = -0.77, P = 0.23, n = 4). CD4+ cells were either PTyr(hi) or PTyr(in), exhibiting a tendency for a positive R (R = 0.59, P = 0.124, n= 8) between PTyr(hi) and L-sel(hi) cells only. In conclusion, our results associate an up-regulation of alpha4 and alpha5 chains expression with PTyr(hi) levels and, as elsewhere published, with increased adhesion to fibronectin up to the "early" DP stage, but not afterwards.
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Affiliation(s)
- S R Dalmau
- Division of Experimental Medicine, Basic Research Center, National Cancer Institute, Rio de Janeiro, RJ, Brazil.
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22
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Lancaster JL, Woldorff MG, Parsons LM, Liotti M, Freitas CS, Rainey L, Kochunov PV, Nickerson D, Mikiten SA, Fox PT. Automated Talairach atlas labels for functional brain mapping. Hum Brain Mapp 2000. [PMID: 10912591 DOI: 10.1002/1097-0193(200007)10:3<120::aid-hbm30>3.0.co;2-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
An automated coordinate-based system to retrieve brain labels from the 1988 Talairach Atlas, called the Talairach Daemon (TD), was previously introduced [Lancaster et al., 1997]. In the present study, the TD system and its 3-D database of labels for the 1988 Talairach atlas were tested for labeling of functional activation foci. TD system labels were compared with author-designated labels of activation coordinates from over 250 published functional brain-mapping studies and with manual atlas-derived labels from an expert group using a subset of these activation coordinates. Automated labeling by the TD system compared well with authors' labels, with a 70% or greater label match averaged over all locations. Author-label matching improved to greater than 90% within a search range of +/-5 mm for most sites. An adaptive grey matter (GM) range-search utility was evaluated using individual activations from the M1 mouth region (30 subjects, 52 sites). It provided an 87% label match to Brodmann area labels (BA 4 & BA 6) within a search range of +/-5 mm. Using the adaptive GM range search, the TD system's overall match with authors' labels (90%) was better than that of the expert group (80%). When used in concert with authors' deeper knowledge of an experiment, the TD system provides consistent and comprehensive labels for brain activation foci. Additional suggested applications of the TD system include interactive labeling, anatomical grouping of activation foci, lesion-deficit analysis, and neuroanatomy education.
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Affiliation(s)
- J L Lancaster
- Research Imaging Center, University of Texas Health Science Center at San Antonio,78284, USA.
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23
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Lancaster JL, Woldorff MG, Parsons LM, Liotti M, Freitas CS, Rainey L, Kochunov PV, Nickerson D, Mikiten SA, Fox PT. Automated Talairach atlas labels for functional brain mapping. Hum Brain Mapp 2000; 10:120-31. [PMID: 10912591 PMCID: PMC6871915 DOI: 10.1002/1097-0193(200007)10:3<120::aid-hbm30>3.0.co;2-8] [Citation(s) in RCA: 2609] [Impact Index Per Article: 108.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/1999] [Accepted: 04/28/2000] [Indexed: 11/12/2022] Open
Abstract
An automated coordinate-based system to retrieve brain labels from the 1988 Talairach Atlas, called the Talairach Daemon (TD), was previously introduced [Lancaster et al., 1997]. In the present study, the TD system and its 3-D database of labels for the 1988 Talairach atlas were tested for labeling of functional activation foci. TD system labels were compared with author-designated labels of activation coordinates from over 250 published functional brain-mapping studies and with manual atlas-derived labels from an expert group using a subset of these activation coordinates. Automated labeling by the TD system compared well with authors' labels, with a 70% or greater label match averaged over all locations. Author-label matching improved to greater than 90% within a search range of +/-5 mm for most sites. An adaptive grey matter (GM) range-search utility was evaluated using individual activations from the M1 mouth region (30 subjects, 52 sites). It provided an 87% label match to Brodmann area labels (BA 4 & BA 6) within a search range of +/-5 mm. Using the adaptive GM range search, the TD system's overall match with authors' labels (90%) was better than that of the expert group (80%). When used in concert with authors' deeper knowledge of an experiment, the TD system provides consistent and comprehensive labels for brain activation foci. Additional suggested applications of the TD system include interactive labeling, anatomical grouping of activation foci, lesion-deficit analysis, and neuroanatomy education.
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Affiliation(s)
- J L Lancaster
- Research Imaging Center, University of Texas Health Science Center at San Antonio,78284, USA.
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24
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Lancaster JL, Woldorff MG, Parsons LM, Liotti M, Freitas CS, Rainey L, Kochunov PV, Nickerson D, Mikiten SA, Fox PT. Automated Talairach atlas labels for functional brain mapping. Hum Brain Mapp 2000. [PMID: 10912591 DOI: 10.1002/1097-0193(200007)10:3<120::aid-hbm30>3.0.co;2-8] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
An automated coordinate-based system to retrieve brain labels from the 1988 Talairach Atlas, called the Talairach Daemon (TD), was previously introduced [Lancaster et al., 1997]. In the present study, the TD system and its 3-D database of labels for the 1988 Talairach atlas were tested for labeling of functional activation foci. TD system labels were compared with author-designated labels of activation coordinates from over 250 published functional brain-mapping studies and with manual atlas-derived labels from an expert group using a subset of these activation coordinates. Automated labeling by the TD system compared well with authors' labels, with a 70% or greater label match averaged over all locations. Author-label matching improved to greater than 90% within a search range of +/-5 mm for most sites. An adaptive grey matter (GM) range-search utility was evaluated using individual activations from the M1 mouth region (30 subjects, 52 sites). It provided an 87% label match to Brodmann area labels (BA 4 & BA 6) within a search range of +/-5 mm. Using the adaptive GM range search, the TD system's overall match with authors' labels (90%) was better than that of the expert group (80%). When used in concert with authors' deeper knowledge of an experiment, the TD system provides consistent and comprehensive labels for brain activation foci. Additional suggested applications of the TD system include interactive labeling, anatomical grouping of activation foci, lesion-deficit analysis, and neuroanatomy education.
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Affiliation(s)
- J L Lancaster
- Research Imaging Center, University of Texas Health Science Center at San Antonio,78284, USA.
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25
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Dalmau SR, Freitas CS, Savino W. Upregulated expression of fibronectin receptors underlines the adhesive capability of thymocytes to thymic epithelial cells during the early stages of differentiation: lessons from sublethally irradiated mice. Blood 1999; 93:974-90. [PMID: 9920847] [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: 02/10/2023] Open
Abstract
A 250-cGy whole-body gamma-radiation dose was used to induce thymus regression in mice, and to study the expression and function of extracellular matrix (ECM) receptors in distinct thymocyte subsets emerging during repopulation of the organ. The onset of regeneration was detected from day 2 to 3 postirradiation (P-Ir), when a remarkable increase in the absolute counts of CD3(-)CD25(hi)CD44(+) and CD3(-)CD25(in/hi)CD44(-) cells occurred. Enhanced expression of L-selectin, alpha4, and alpha5 integrin chains (L-selhi alpha4(hi) alpha5(hi)) was also exhibited by these cells. This pattern of expression was maintained until the CD4(+)CD8(+) (DP) young stage was achieved. Afterward, there was a general downregulation of these ECM receptors in DP as well as in CD4(+) or CD8(+) single positive (SP) thymocytes (L-selin alpha4(in) alpha5(in)). In some recently generated SP cells, alpha4 expression was downregulated before the alpha5 chain, and L-selectin was upregulated in half of more mature cells. The expression of the alpha6 integrin chain was downregulated only in maturing CD4(+) cells. Importantly, the increased expression of L-selectin and alpha4 and alpha5 chains in thymocytes was strongly correlated with their adhesiveness to thymic epithelial cells (TEC) in vitro. Blocking experiments with monoclonal antibody or peptides showed the following: (1) that the LDV rather than the REDV cell attachment motif in the IIIC segment of fibronectin is targeted by the alpha4 integrin during thymocyte/TEC adhesion; (2) that the RGD motif of the 120-kD fragment of fibronectin, a target for alpha5 integrin, has a secondary role in this adhesion; and (3) that the YIGSR cell attachment motif of the beta1 chain of laminin/merosin recognized by a nonintegrin receptor is not used for thymocyte adherence. In conclusion, our results show that an upregulated set of receptors endows CD25(+) precursors and cells up to the young DP stage with a high capability of interacting with thymic ECM components.
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MESH Headings
- Animals
- Antibodies, Monoclonal/metabolism
- Antigens, CD/biosynthesis
- Antigens, CD/genetics
- Cell Adhesion
- Cell Differentiation
- Epithelial Cells/physiology
- Extracellular Matrix/metabolism
- Female
- Immunologic Deficiency Syndromes/etiology
- Immunologic Deficiency Syndromes/pathology
- Integrin alpha4
- Integrin alpha5
- Integrin alpha6
- L-Selectin/biosynthesis
- L-Selectin/genetics
- Male
- Mice
- Mice, Inbred C57BL
- Oligopeptides/metabolism
- Peptide Fragments/metabolism
- Phosphorylation
- Protein Processing, Post-Translational
- Protein-Tyrosine Kinases/metabolism
- Radiation Injuries, Experimental/immunology
- Radiation Injuries, Experimental/pathology
- Receptors, Fibronectin/biosynthesis
- Receptors, Fibronectin/genetics
- Receptors, Interleukin-2/analysis
- Regeneration
- T-Lymphocyte Subsets/physiology
- Thymus Gland/cytology
- Thymus Gland/embryology
- Thymus Gland/physiology
- Thymus Gland/radiation effects
- Up-Regulation
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Affiliation(s)
- S R Dalmau
- Program of Experimental Medicine, Basic Research Center, National Cancer Institute, Rio de Janeiro, Brazil
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26
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Freitas CS, Dalmau SR, Savino W. Epidermal growth factor (EGF) modulates fetal thymocyte growth and differentiation: partial reversal by insulin, mimicking by specific inhibitors of EGF receptor tyrosine kinase activity, and differential expression of CD45 phosphatase isotypes. J Immunol 1998; 161:3384-92. [PMID: 9759855] [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: 02/08/2023]
Abstract
We have recently reported that epidermal growth factor (EGF) modulates thymocyte development in fetal thymus organ cultures. Exogenously added EGF arrested thymocyte growth and differentiation, acting at the transition from the CD4-CD8- (double-negative (DN)) to the CD4+CD8+ (double-positive (DP)) phenotype. In this study, we further investigate some molecular aspects of this blockade. This inhibitory effect could be mimicked by tyrphostins, which are selective inhibitors of EGF receptor kinase activity. An attempt to use insulin (INS) as a synergizing effector resulted in partial restoration of lobe cellularity, leading to expansion of the CD44-CD25+ DN subset. However, INS did not overcome the EGF-driven blockade of the thymocyte DN --> DP transition. Analysis of CD45 phosphatase showed that this transition was preceded by a rise in CD45RB isotype expression. At the end of a 7-day culture, the remaining DN cells from both EGF- and EGF+INS-treated fetal thymus organ cultures showed a CD45RB- phenotype and were negative for the EGF-immunoreactive molecule described previously on the fetal thymocyte surface. This finding implies that neither molecule is related to the growth capability of cells at this early developmental stage; it is more likely that the molecules are related to subsequent events in the thymocyte pathway to the DP phenotype. Thus, our data support the concept that EGF receptor-related circuitry may be relevant in thymus ontogeny. Additionally, evidence is provided for the duality between growth and differentiation at this particular early stage of thymocyte development.
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Affiliation(s)
- C S Freitas
- Department of Immunology, Basic Research Center, National Cancer Institute of Rio de Janeiro, Brazil
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27
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Abstract
In the present study, we used the fetal organ culture (FTOC) technique in order to study a putative effect of epidermal growth factor (EGF) on the thymus ontogeny. Functional EGF receptors and more recently the EGF molecule itself, respectively, on the membrane of epithelial components of thymic stroma and on a few thymocytes in adult thymus, had been reported in the literature. We could observe a dose-dependent decrease in cellularity and a progressive retention of thymocytes in the double-negative (CD4-/CD8-) stage of differentiation when exogenous EGF was added. Epidermal growth factor interfered with both fetal stroma growth and thymocyte development at a precise moment, that is, in the passage from double-negative to the double-positive (CD4+/CD8+) stage. After a 7-day FTOC in the presence of EGF, most cells recovered were Thy-1.2+, c-kit+, TSA1-/int, CD3-, and one of CD44high/CD25int, CD44-/CD25int, or CD44/CD25-. Some developed into gammadeltaTCR+ cells with a mature (CD3+) phenotype, but not into alphabetaTCR+ thymocytes. It seems that EGF addition makes the cultures "nonpermissible" for alphabetaTCR+ thymocyte generation. We report here the presence of a high Mr "EGF-like" molecule on the membrane of fetal thymocytes, which role in the observed effects is under investigation. Further biochemical characterization of this molecule is still required, because its presence was only evidenced on the basis of its antigenicity.
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Affiliation(s)
- C S Freitas
- Department of Immunology, Basic Research Center, National Cancer Institute of Rio de Janeiro, Brasil
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28
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Abstract
Cytokines such as interleukin-1 (IL-1), tumor necrosis factor alpha (TNF-alpha), stem cell factor (SCF), and interleukin-12 (IL-12), among others, are presently known to exert a radioprotective effect on bone marrow (BM) precursor cells. IL-1, TNF-alpha, transforming growth factor-beta (TGF-beta), and macrophage inflammatory protein-1 alpha (MIP-1alpha) exert a chemoprotective effect on BM cells, while a putative role of IL-12 in this effect is still unknown. IL-1, SCF, and IL-12 are known to promote BM precursor cell cycling. Conversely, TNF-alpha, MIP-1alpha, and TGF-beta, the latter a radiosensitizer, induce cycle arrest in these cells. Cycling increases radioprotection, while arrest reduces chemical damage. IL-1 and TNF-alpha are unique in their ability to induce detoxifying mechanisms. The present communication overviews these effects. It also proposes a model, based on the induction of biochemical detoxifying mechanisms, aiming to explain BM cell radio- and chemoprotection by opposite cell cycle-acting cytokines.
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29
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Lancaster JL, Rainey LH, Summerlin JL, Freitas CS, Fox PT, Evans AC, Toga AW, Mazziotta JC. Automated labeling of the human brain: a preliminary report on the development and evaluation of a forward-transform method. Hum Brain Mapp 1997. [PMID: 20408222 DOI: 10.1002/(sici)1097-0193(1997)5:4<>1.0.co;2-t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2023] Open
Abstract
A forward-transform method for retrieving brain labels from the 1988 Talairach Atlas using x-y-z coordinates is presented. A hierarchical volume-occupancy labeling scheme was created to simplify the organization of atlas labels using volume and subvolumetric components. Segmentation rules were developed to define boundaries that were not given explicitly in the atlas. The labeling scheme and segmentation rules guided the segmentation and labeling of 160 contiguous regions within the atlas. A unique three-dimensional (3-D) database label server called the Talairach Daemon (http://ric.uthscsa.edu/projects) was developed for serving labels keyed to the Talairach coordinate system. Given an x-y-z Talairach coordinate, a corresponding hierarchical listing of labels is returned by the server. The accuracy and precision of the forward-transform labeling method is now under evaluation.
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Affiliation(s)
- J L Lancaster
- Research Imaging Center, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78284-6240, USA
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30
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Abstract
Increasing evidence reveals that extracellular matrix components can be regarded as a group of mediators in intrathymic T-cell migration and/or differentiation. Yet, little is known about the expression and putative function of one particular extracellular matrix protein, namely, tenascin in the thymus. Herein we investigated, by means of immunocytochemistry, tenascin expression in normal infant and fetal human thymuses, as well as in cultures of thymic microenvironmental cells. In situ, tenascin distribution is restricted to the medulla and cortico-medullary regions of normal thymuses. This pattern thus differed from that of fibronectin, laminin and type IV collagen, in which subseptal basement membranes were strongly labeled. Interestingly, tenascin did not co-localize with the cytokeratin-defined thymic epithelial cell network. This was in keeping with the in vitro data showing that tenascin-bearing cells were nonepithelial (and probably nonfibroblastic) microenvironmental elements. Studies with fetal thymuses revealed a developmentally regulated expression of tenascin, with a faint but consistent network labeling, in thymic rudiments as early as 12 weeks of gestational age, that progressed to a strong TN expression at 18 weeks of fetal development, which was similar to the distribution pattern observed thereafter, including postnatally. Our results clearly indicated that tenascin is constitutively expressed in the human thymus, since early stages of thymic ontogeny, and suggest that the cell type responsible for its secretion is a nonepithelial microenvironmental cell.
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Affiliation(s)
- C S Freitas
- Department of Immunology, National Cancer Institute, Rio de Janeiro, Brazil
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31
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Dalmau SR, Freitas CS. [Hematopoiesis: II. Cytokines with radio and chemoprotection effects]. Rev Assoc Med Bras (1992) 1994; 40:63-8. [PMID: 8061699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Affiliation(s)
- S R Dalmau
- Departamento de Bioquímica da Universidade do Estado do Rio de Janeiro
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32
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Dalmau SR, Freitas CS, Tabak DG. Interleukin-1 and tumor necrosis factor-alpha as radio- and chemoprotectors of bone marrow. Bone Marrow Transplant 1993; 12:551-63. [PMID: 8136738] [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: 01/29/2023]
Abstract
Administration of interleukin 1 (IL-1) or tumor necrosis factor-alpha (TNF alpha) protects bone marrow precursor cells (BMPC) from ionizing radiation and antineoplastic drugs. The time of injection is critical: the best protective results being obtained when cytokines are given around 24h prior to the induced injury. Multiple daily cytokine injections that precede irradiation or drug administration are more effective than single ones although single doses are quite effective at increasing survival in mice. Protection is positively correlated with both rapid granulocyte recovery and BMPC survival. Mechanisms involved in BMPC radioprotection include: (1) push to the S/G2 + M or arrest in the G0 phases of the cell cycle by IL-1 or TNF alpha, respectively, and (2) induction of mitochondrial manganous superoxide dismutase synthesis. For BMPC chemoprotection, proposed mechanisms are: (1) increase of aldehyde dehydrogenase synthesis, and (2) modulation of multiple-drug resistant gene expression. Stimulation of glutathione synthesis in BMPC could be operating in both radio- and chemoprotection. These findings point to the relevance of IL-1 or TNF alpha in cancer therapy as a means of reducing BMPC sensitivity to cytoreductive drugs or irradiation (including radioimmunotherapy) as well as in in vitro tumor cell purging with drugs in autologous BMT. Prior administration of these cytokines should be also considered for people in imminent danger of exposure to radiation.
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Affiliation(s)
- S R Dalmau
- Department of Immunology, National Cancer Institute, Rio de Janeiro, Brazil
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Abstract
The observation that murine thymocytes increase their proliferation to interleukin 1 (IL-1) in the presence of phytohemagglutinin (PHA) when pre-incubated with interleukin 2 (IL-2) allowed the introduction of a modified assay for the measurement of IL-1 or the search of thymocyte-inducing proliferative activities in biological samples. Pre-incubation of thymocytes for 24 hr with 50 u/ml IL-2, followed by washings, elicited their maximal response to IL-1 in the usual lymphocyte activating factor (LAF) assay. This suggests that sequential events lead to thymocyte activation. The responsiveness is three to five fold greater than, and the total time of assay is the same as that of the LAF assay. Interestingly, pre-incubation with IL-2 renders thymocytes more sensitive than responsive to crude monocyte conditioned media. The use of the MTT colorimetric method for the assessment of thymocyte proliferation, and of the lectin jacalin as a co-mitogen are suggested as alternatives to be used in co-stimulatory assays.
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Affiliation(s)
- S R Dalmau
- Instituto Nacional de Câncer, Pesquisa Básica, Rio de Janeiro, Brasil
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Dalmau SR, Freitas CS. Methyl-alpha-galactoside enhances the mitogenicity of the lectin jacalin. Mem Inst Oswaldo Cruz 1992; 87:305-6. [PMID: 1308574 DOI: 10.1590/s0074-02761992000200022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- S R Dalmau
- Instituto Nacional de Cancer, RJ, Brasil
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Dalmau SR, Sabino KC, Preza PA, Freitas CS. Human monokine participation in murine thymocyte proliferation. Mem Inst Oswaldo Cruz 1991; 86:501-3. [PMID: 1842453 DOI: 10.1590/s0074-02761991000400031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- S R Dalmau
- Instituto Nacional de Cancer, Centro de Pesquisa Básica, Rio de Janeiro, Brasil
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Dalmau SR, Freitas CS. [Hematopoiesis: I. Cytokines involved in its regulation]. AMB Rev Assoc Med Bras 1991; 37:99-106. [PMID: 1719584] [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: 12/28/2022]
Abstract
The study of the direct involvement of colony stimulating factors, interleukins, and other purified factors in distinct steps of hematopoiesis has been complicated by the in vitro presence of non-hematopoietic cells which can intermediate the effects observed on hematopoietic precursors. The review covers the recent finding that the CD34 antigen is expressed on the membranes of essentially all pluripotent stem cells, but is lacking in the majority of the differentiated blood and stromal bone marrow cells. This finding allowed in vitro experiments with selected CD34+ hematopoietic precursors, and a consequent reevaluation of the participation of different factors in their differentiation. The role of interferons, tumor necrosis factors, and transforming growth factors beta in the negative regulation of hematopoiesis is also analysed.
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Dalmau SR, Freitas CS. Nylon wool column--a tool for obtaining monokine-rich eluates in the absence of serum. Mem Inst Oswaldo Cruz 1990; 85:153-62. [PMID: 2087156 DOI: 10.1590/s0074-02761990000200003] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Diverse conditions for stimulating human mononuclear cells to release thymocyte costimulatory factors were tested for their contribution to the generation of supernatants containing high titers of these monokines. Activity titers increased with LPS concentration, reaching a plateau between 1 and 10 micrograms/ml. Indomethacin did not modify the monokine release, but the assay for thymocyte costimulatory activity was substantially affected by inhibitory substances produced by the monocytes in the absence of indomethacin. The use of nylon wool columns to trap the cells was shown to be effective in raising cellular densities without decreasing activity titers. As a result, the yield per cell could be maintained even in the absence of serum, an important step toward the goal of purifying bioactive peptides from crude broths.
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Affiliation(s)
- S R Dalmau
- Instituto Nacional do Câncer, Pesquisa Básica/*CEMO, Rio de Janeiro, RJ, Brasil
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Dalmau SR, Freitas CS. Standardization of the IL-1 comitogenic assay using thymocytes from LPS-sensitive mouse strains. Mem Inst Oswaldo Cruz 1990; 85:123-5. [PMID: 2215225 DOI: 10.1590/s0074-02761990000100023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Affiliation(s)
- S R Dalmau
- Instituto Nacional de Câncer, Pesquisa Básica, Rio de Janeiro, Brasil
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