الملخص
The study aimed to investigate the effect of processing on lectin protein in four toxic Chinese medicines tubers of Pinellia ternata,P. pedatisecta,Arisema heterophyllum and Typhonium giganteum. Western blot was used to semi-quantitatively analyze the content of lectin in the four kinds of toxic Chinese medicines and their different processed products. Raw products and lectin were treated by heating or soaking in ginger juice or alum solution. The effects of different excipients and the heating methods on lectin proteins were investigated. The results showed that the content of lectin in raw products of P. pedatisecta,P. ternata,A. heterophyllum,and T. giganteum were 7. 3%,4. 9%,2. 7%,2. 3%,respectively. And the content of lectin in Pinelliae Rhizoma praeparatum cum alumine was 0. 027%. Lectin was not detected in the Pinelliae Rhizoma Praeparatum cum Zingibere et Alumine,Arisaematis Rhizma Praeparatum and Typhonii Rhizoma Praeparatum,which indicated that processing could significantly reduce the content of active lectin in raw products. The results also showed that with the prolongation of soaking and heating time,the content of lectin in raw products decreased gradually,while the content was almost unchanged when soaked in ginger juice alone. The effects of different excipients and heating on lectin were the same as those on raw products. Therefore,the method with alum soaking and heating can reduce the content of active lectin,which is the key to reduce the toxicity of toxic Chinese medicines. In this paper,Western blot was used to study the content of toxic protein in Araceae toxic Chinese medicines as an evaluation method of the processing degree.
الموضوعات
Araceae/chemistry , Chemistry, Pharmaceutical/methods , Drugs, Chinese Herbal/analysis , Lectins/analysis , Plant Tubers/chemistry , Rhizome/chemistryالملخص
ABSTRACT Seeds of Acacia farnesiana are commonly sold in the local markets of northeastern Brazil as a therapeutic agent. The present work aimed to evaluate the anti-inflammatory and analgesic activities of proteins obtained from A. farnesiana seeds. Five different protein fractions (albumin, globulin, prolamin, acidic and basic glutelins) were obtained and investigated for the protein pattern, the presence of hemagglutinating and proteolytic activities. The globulin fraction (GLB) was also evaluated for anti-inflammatory and analgesic activities. Globulins reduced the paw edema induced by carrageenan in a dose-dependent manner, which was accompanied by a reduction of myeloperoxidase activity (p < 0.05). Additionally, GLB reduced the neutrophil peritoneal migration induced by carrageenan. However, GLB was not able to inhibit the edema triggered by dextran. Pre-treatment with globulins reduced the abdominal constrictions induced by acetic acid as well as the paw licking time induced by formalin (69.1% at first phase). However, it did not produce a significant antinociceptive effect in the hot plate test (55-56 °C). Treating the GLB with heat (at 100 °C for 30 min) abolished its anti-edematogenic and hemagglutinating activities. Our results showed that seeds from A. farnesiana are a source of proteins with anti-inflammatory and analgesic properties.
RESUMO Sementes de Acacia farnesiana são comumente vendidas em feiras locais no nordeste do Brasil como agente terapêutico. O presente trabalho objetivou avaliar as atividades antiinflamatória e antinociceptiva de proteínas obtidas de sementes de A. farnesiana. Cinco frações protéicas distintas (albuminas, globulinas, prolaminas, glutelinas ácidas e básicas) foram obtidas e investigadas quanto o perfil de proteínas, presença de atividade hemaglutinante e proteolítica. A fração globulina (GLB) também foi avaliada quanto a presença de atividade antiinflamatória e analgésica. Globulinas reduziram o edema de pata induzido por carragenina de modo dependente da dose que foi acompanhada da redução da atividade da mieloperoxidase (p < 0,05). Em adição, GLB reduziu a migração de neutrófilos para cavidade peritoneal induzida por carragenina. Entretanto, GLB não foi capaz de inibir o edema induzido por dextrana. O pré-tratamento com globulinas reduziu as contorções abdominais induzidas por ácido acético, bem como o tempo de lambedura da pata induzida por formalina (69.1% na primeira fase). Por outro lado, GLB não produziu um efeito antinociceptivo significante no teste de placa quente (55-56 °C). O pré-tratamento de GLB com calor (100 °C por 30 min) aboliu sua atividade anti-edematogênica e hemaglutinante. Nossos resultados mostraram que sementes de A. farnesiana são fonte de proteínas com propriedades antiinflamatórias e analgésicas.
الموضوعات
Acacia/classification , Analgesics/classification , Anti-Inflammatory Agents/classification , Nociception/classification , Lectins/analysisالملخص
Introdução e objetivos: O glioblastoma multiforme é um glioma de alto grau que apresenta um prognóstico ruim. O diagnóstico definitivo é estabelecido pela avaliação histológica, porém este pode apresentar conflitos na classificação, com isso surge à necessidade de ferramentas que auxiliem o patologista em sua análise. Atualmente, maior ênfase tem sido dada a alterações na glicosilação, pois estão associadas a neoplasias, e a descoberta da capacidade de lectinas em reconhecer tais alterações fez destas, ferramentas aplicáveis para o diagnóstico biomédico. Dessa forma, o objetivo deste trabalho é analisar a marcação das lectinas CpL, WGA e Con A em células da linhagem C6...
Introduction and objectives: Glioblastoma multiforme is a high-grade glioma that has a poor prognosis. The definitive diagnosis is established by histological assessment. However, this can present conflicts in grading gliomas, which justifies new tools to assist the pathologist in his analysis. Currently, it is known that there are changes in glycosylation pattern of molecules associated with cancer, and the discovery of the ability of lectins to recognize these changes made these tools applicable for biomedical diagnosis. Thus, the aim of this study is to analyze the labelling of C6...
الموضوعات
Humans , Glioma/complications , Glioma/diagnosis , Glioma/immunology , Glioma/pathology , Glioma/blood , Lectins , Lectins/analysis , Lectins/physiology , Lectins/immunologyالملخص
Lectins are carbohydrate-binding proteins of non-imune origin. This group of proteins is distributed widely in nature and they have been found in viruses, microorganisms, plants and animals. Lectins of plants have been isolated and characterized according to their chemical, physical-chemical, structural and biological properties. Among their biological activities, we can stress its fungicidal action. It has been previously described the effect of the lectins Dviol, DRL, ConBr and LSL obtained from the seeds of leguminous plants on the growth of yeasts isolated from vaginal secretions. In the present work the experiments were carried out in microtiter plates and the results interpreted by both methods: visual observations and a microplate reader at 530nm. The lectin concentrations varied from 0.5 to 256µg/mL, and the inoculum was established between 65-70% of trammitance. All yeast samples isolated from vaginal secretion were evaluated taxonomically, where were observed macroscopic and microscopic characteristics to each species. The LSL lectin did not demonstrate any antifungal activity to any isolate studied. The other lectins DRL, ConBr and DvioL, showed antifungal potential against yeast isolated from vaginal secretion. These findings offering offer a promising field of investigation to develop new therapeutic strategies against vaginal yeast infections, collaborating to improve women's health.
الموضوعات
Humans , Female , Antifungal Agents/analysis , Antifungal Agents/isolation & purification , Bodily Secretions , Plant Lectins/analysis , Plant Lectins/isolation & purification , Lectins/analysis , Lectins/isolation & purification , Yeasts/growth & development , Yeasts/isolation & purification , Vaginosis, Bacterial , Methods , Patientsالملخص
Innate immunity plays a key role in the control of microbial infections in both vertebrates and invertebrates. Haemolymph samples from Shistocerca gregaria, obtained after Trypanosoma brucei brucei challenge were analyzed for their protein profiles using SDS and 2D-PAGE and also evaluated for antitrypanosomal activity in vitro. Protein induction was found to increase with time, peaking at about 18 hours. In SDS-PAGE, the intensity levels of five polypeptides were found to vary from prechallenge levels. Further analysis of the polypeptides on 2D-PAGE showed variations in their induction pattern with some being induced, upregulated or suppressed with time of induction. Samples collected from insects challenged with parasites followed by sugars, D-glucosamine had the highest inhibitory effect on the level of protein induction while D-galactose had the least effect. When screened for trypanolytic activity against T. brucei brucei, the samples had pronounced antitrypanosomal activity which peaked with the 18 hour sample. Antibodies raised against Glossina proteolytic lectin [Gpl], showed no cross-reactivity to Shistocerca gregaria induced haemolymph proteins in Western blots. Antitrypanosoma proteins induced during vector-parasite interaction have the potential of being used to modulate tsetse fly vectorial capacity
الموضوعات
Insect Proteins/analysis , Lectins/analysis , Trypanosoma brucei brucei , Hemolymph , Electrophoresis, Gel, Two-Dimensional/methodsالملخص
Fascioliasis is a chronic hepatic disease and may be resulted from mechanical/molecular parasite adhesion to host liver tissue. The aim of this study was to detect surface carbohydrate and lectin, carbohydrate-binding protein isolation that might be responsible of this molecular binding. The present experimental work was conducted in the Department of Medical Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. Fasciola hepatica parasites were collected from abattoir [Saman, Tehran, Iran] and surface mannose-carbohydrate was detected by fluorescein isothiocyanate [FITC] conjugated lectin [Lentil]. Lectin of tegumental tissue from F. hepatica was isolated by affinity chromatography and detected by sodium dodecyl sulfate polyacrylamide gel electrophoresis [SDS-PAGE]. Mannose carbohydrate was observed on the surface of tegumental tissue from parasite under fluorescence microscope. Carbohydrate-binding protein or lectin with MW of 50 kDa also was isolated from homogenized tegument of helminth. These results are important for understanding of molecular pathogenesis of F. hepatica at the chronic phase of fascioliasis
الموضوعات
Lectins/analysis , Carbohydrates/analysis , Fascioliasis , Enzyme-Linked Immunosorbent Assayالملخص
The cell surface carbohydrates of four strains of Aeromonas caviae were analyzed by agglutination and lectin-binding assays employing twenty highly purified lectins encompassing all sugar specificities. With the exception of L-fucose and sialic acid, the sugar residues were detected in A. caviae strains. A marked difference, however, in the pattern of cell surface carbohydrates in different A. caviae isolates was observed. Specific receptors for Tritricum vulgaris (WGA), Lycopersicon esculentum (LEL) and Solanum tuberosum (STA) (D-GlcNAc-binding lectins) were found only in ATCC 15468 strain, whereas Euonymus europaeus (EEL, D-Gal-binding lectin) sites were present exclusively in AeQ32 strain, those for Helix pomatia (HPA, D-GalNAc-binding lectin) in AeC398 and AeV11 strains, and for Canavalia ensiformes (Con A, D-Man-binding lectin) in ATCC 15468, AeC398, AeQ32 and AeV11 strains, after bacterial growing at 37ºC. On the other hand, specific receptors for WGA and EEL were completely abrogated growing the bacteria at 22ºC. Binding studies with 125I- labeled lectins from WGA, EEL and Con A were performed. These assays essentially confirmed the selectivity, demonstrated in the agglutination assays of these lectins for the A. caviae strains.
Os carboidratos de superfície celular de quatro amostras de Aeromonas caviae foram analisados por aglutinação e ensaios de ligação de lectinas empregando vinte lectinas altamente purificadas com especificidade para açúcares. Com exceção da L-fucose e do ácido siálico, os resíduos de açúcar foram detectados em amostras de A. caviae. Entretanto, foi observada uma diferença marcante no padrão de carboidratos de superfície celular em diferentes amostras de A. caviae. Receptores específicos para Tritricum vulgaris (WGA), Lycopersicon esculentum (LEL) e Solanum tuberosum (STA), lectinas de ligação a D-GlcNAc, foram encontrados apenas na amostra ATCC 15468, enquanto sítios de Euonymus europaes (EEL), lectina de ligação a D-Gal, estavam presentes exclusivamente na amostra AeQ32, sítios de Helix pomatia (HPA), lectina de ligação a D-GalNac, nas amostras AeC398 e AeV11 e de Canavalia ensiformis (Com A), lectina de ligação a D-Man, nas amostras ATCC 15468, AeC398, AeQ32 e AeV11, após crescimento bacteriano a 37ºC. Por outro lado, receptores específicos para WGA e EEL foram completamente abolidos após o crescimento das bactérias a 22ºC. Estudos de ligação com lectinas WGA, EEL e Con A marcadas com 125I também foram realizados. Esses ensaios confirmaram a seletividade, demonstrada em ensaios de aglutinação dessas lectinas para as amostras de A. caviae.
الموضوعات
Humans , Child , Aeromonas/isolation & purification , Carbohydrates/analysis , In Vitro Techniques , Lectins/analysis , Agglutination , Culture Media , Methodsالموضوعات
Humans , Infant, Newborn , Adult , Middle Aged , Glycoconjugates/metabolism , Lectins/metabolism , Palate/growth & development , Salivary Glands/growth & development , Carbohydrate Metabolism , Carbohydrates/chemistry , Glycoconjugates/analysis , Histocytochemistry , Human Development , Lectins/analysis , Palate/embryology , Salivary Glands/embryologyالملخص
O sistema complemento é formado por aproximadamente 35 proteínas e glicoproteínas distribuídas no plasma, outros líquidos biológicos e superfícies celulares. Essas proteínas atuam em uma reação sequencial em cascata e representam um dos principais mediadores da defesa inata do hospedeiro e da inflamação. A ativação do sistema complemento tanto pode ser benéfica para o hospedeiro, como na resistência a microrganismos invasores, como pode ser deletéria em uma variedade de doenças imunopatologicamente mediadas. O complemento pode ser ativado por qualquer das três vias, a via clássica, dependente do anticorpo, a via alternativa ou a recém-descrita, via das lectinas (MBL). As consequências biológicas da ativação do complemento são principalmente a defesa contra infecções piogênicas, a interação entre imunidade inata e adaptativa e a remoção de complexos-imunes e produtos da injúria tecidual. O complemento reconhece, opsoniza ou lisa partículas, incluindo bactérias, leveduras e outros microrganismo, restos celulares e células alteradas do hospedeiro. Há também evidências de que o complemento contribui significativamente na regulação da resposta imune. O principal objetivo da presente é revisão é fornecer uma visão atual da ativação e das propriedades biológicas desse sistema, enfatizando sua importãncia na resposta imune inata e na homeostasia do hospedeiro.
الموضوعات
Humans , Complement Activation , Complement Pathway, Alternative , Complement Pathway, Classical , Lectins/analysisالملخص
El presente estudio refiere a una nueva herramienta que permite detectar fechaciente y tempranamente la naturaleza maligna del epitelio colorrectal. El objetivo es determinar una característica biológica diferente entre tejido normal y neo-plásico, como es el nivel de expresión del glicoepitope T (Ag Thomsen-Friedenreich). Se lo caracterizó en una serie de 62 muestras del tejido en estudio, incluyendo 31 normales (sin lesiones anatomopatológicas) y 31 correspondientes a cánceres (en su mayoría moderada o pobremente diferenciados). La expresíon del glicoconjugado se demostró por tectínhistoquímica, usando lectina PNA. Los patrones de unión de lectina fueron determinados en células absortivas (cilídricas) y caliciformes, normales y neoplásicas, encontrándose patrones característicos y diferentes según tipo de célula y naturaleza del tejido. El análisis estadístico de la localización citoestructural del Ag T en ambas poblaciones sugiere fuertemente que existe asociación entre el patrón de expresión y el grado de diferenciación tisular. La sencillez de la metodología hace a la determinación aplicable en diagnóstico de rutina y además tiene importante valor pronóstico.
الموضوعات
Humans , Male , Female , Middle Aged , Antigens, Tumor-Associated, Carbohydrate/analysis , Carcinoma/pathology , Colorectal Neoplasms/pathology , Epithelial Cells/chemistry , Lectins/analysis , Antigens, Tumor-Associated, Carbohydrate/immunology , Carcinoma/chemistry , Carcinoma/immunology , Colorectal Neoplasms/chemistry , Colorectal Neoplasms/immunology , Epithelial Cells/immunology , Immunohistochemistryالملخص
Jack fruit (Artocarpus Heterophyllus) seed extract contains a lectin termed Jack fruit lectin (JFL) which possesses diversed biological properties. A detailed analysis of its properties has been lacking. The present investigation was initiated to study the detail properties of JFL. After extraction and purification on affigel galactosamine-agarose column, JFL was subjected to ND-PAGE. Several different charged species from ND-PAGE upon SDS-PAGE gave rise to two dissimilar trimeric subunit at 12.5 and 15.0 KDa and retain biological activity. It was possible to elute the subunit bands separately from polyacrylamide gel to investigate their biological activity. Each subunit was found to be retained the lectin activity. Agglutinating activity of smaller subunit was found to be more, may be due to the greater amount of the subunit. This also suggests that each unit of trimeric JFL have similar lectin activity.
الموضوعات
Animals , Chromatography, Affinity , Chromatography, Agarose , Electrophoresis, Polyacrylamide Gel , Galactosamine , Hemagglutination , Lectins/analysis , Plant Lectins , Plant Proteins/analysis , Seeds/chemistryالملخص
Se estudió la presencia de lectinas, taninos e inhibidores de proteases, en 27 especies de algas colectadas en barreras coralinas de cuatro regiones de Venezuela. Sólo seis de las especies estudiadas, presentaron actividad hemaglutinante atribuible a lectinas, obteniéndose los mayores títulos de hemaglutinación com eritrocitos tratados con pronasa. En cuatro de las especies, las lectinas fueron inhibidas por más de un azúcar sencillo y por la mucina de glándula submaxilar de bovino: Caulerpa sertularioides, Enteromorpha intestinalis, Codium repens y Codium isthmocladum (Chlorophyta). La lectina de Grateloupia filicina fue inhibida solamente por NAcGal. Ninguno de los compuestos probados inhibió la hemaglutinación causada por Halimeda opuntia. El tratamiento de los extractos con polivinilpolipirrolidona eliminó la actividad hemaglutinante de las algas pardas y rojas, menos en dos especies de rodofitas: Grateloupia filicina e Hypnea cervicornis, lo que hace presumir la presencia de lectinas en ambas. Los taninos presentes en las Phaeophyta y Rhodophyta estudiadas son aparentemente del tipo florotaninos con un mayor contenido en las primeras. Sólo se encontró actividad inhibidora de tripsina en: Padina gymnospora (Phaeophyta) y Acantophora spicifera (Rhodophyta). En ningún caso se encontró actividad inhibidora contra subtilisina.
الموضوعات
Lectins/analysis , Protease Inhibitors/analysis , Seaweed/chemistry , Tannins/analysis , Venezuelaالملخص
A histogênese dos cistos na doença policística autossômica dominante (DRPAD) foi investigada em 33 pacientes por imuno-histoquímica. A idade média dos pacientes foi 46,4 anos e a relaçäo masculino:feminino foi 16:17. A maioria dos pacientes apresentou hipertensäo arterial (88 por cento), insuficiência renal crônica (92 por cento) e hematúria (70 por cento). Aneurismas cerebrais, diverticulose colônica e cistos hepáticos e pancreáticos foram encontrados em 56 por cento dos casos. O peso médio dos 53 rins estudados foi 1468 g e o diâmetro médio dos cistos foi 4,2 cm. Em 4 casos, material histológico de 1 dos rins näo esteve disponível. Os anticorpos e lectinas utilizados para identificar os diferentes segmentos dos néfrons foram: vimentina (Vim)-epitélio parietal da cápsula glomerular (G); Lotus tetragonolubus (LTA) e anti-antígeno CD 15 (Cd 15)-túbulo proximal (TP); anti-proteína de Tamm-Horsfall (PTH)-túbulo distal (TD), e anti-antígeno epitelial de membrana (EMA), anti-citoceratina (Ck) 19, Ulex europaeus (UEA-I), Arachis hypogaea (PNA), Dolichos biflorus (DBA) e Glycine maximum (SBA)-túbulo distal (TD) e ducto coletor (DC). Em estudo piloto, analisaram-se 3 rins normais obtidos de autópsias (rins controles-RC) e áreas preservadas de 2 rins com DRPAD (áreas de controle interno-CI), obtendos-e em todos os casos coloraçäo de: G por Vim, TP-LTA e CD15; TD-PTH; TD e DC-EMA, Ck 19, UEA-I, PNA e DBA. Näo houve coloraçäo com SBA. Os 49 rins com DRPAD produziram o seguinte perfil imuno-histoquímico: i) áreas preservadas: anti-Vim-G=82 por cento; LTA-TP=96 por cento; anti-CD 15-anti-Ck 19-TD e Dc=86 por cento e 89 por cento dos casos, respectivamente; ii) Áreas císticas: LTA, anti-CD 15, anti-PTH, anti EMA e anti-Ck 19=7 por cento, 6 por cento, 18 por cento, 97 por cento e 95 por cento dos casos, respectivamente. Näo houve coloraçäo com anti-Vim. Os resultados indicaram que os cistos em casos de DRPAD têm perfil imuno-histoquímico de túbulos distais e ductos coletores.
الموضوعات
Humans , Male , Female , Adult , Lectins , Antibodies, Monoclonal , Polycystic Kidney, Autosomal Dominant/pathology , Immunohistochemistry , Lectins/analysis , Antigens , Kidney Tubules , Kidney Tubules, Distal , Kidney Tubules, Proximal/pathologyالملخص
Os extratos de 176 espécies de sementes de plantas colombianas, correspondentes a 49 famílias e 147 gêneros foram testados para detectar a presença de aglutininas frente a hemácias humanas dos grupos A+, B+, O+ e de cachorro, cavalo e coelho. Os extratos que apresentaram alguma atividade hemaglutinante, foram usados para testar a aglutinaçao de Trypanosoma cruzi e T. rangeli. Além disso, a hemolinfa de 16 espécies nativas de invertebrados foram testadas nas mesmas condiçoes. Diluiçoes seriadas dos extratos foram usadas para as aglutinaçoes. Ambas epimastigotas de T. cruzi e T. rangeli foram aglutinadas com os extratos de sete sementes de plantas diferentes e com dois tipos de hemolinfa de invertebrados. As sementes de cinco plantas aglutinaram exclusivamente as epimastigotas de T. cruzi podendo assim ser usadas para a diferenciaçao entre as formas de cultura desses tripanossomos. A secreçao do pulmao do caramujo (Bulimus sp.) lisou completamente as epimastigotas de T. cruzi mas nao afetou as formas de T. rangeli. Nao foram encontrados extratos que aglutinaram ou lisaram exclusivamente as epimastigotas de T. rangeli.
الموضوعات
Humans , Animals , Dogs , Rabbits , Lectins/immunology , Plants/immunology , Seeds/immunology , Trypanosoma cruzi/immunology , Trypanosoma/immunology , Agglutination Tests , Dogs/blood , Species Specificity , Hemolymph/immunology , Horses/blood , Lectins/analysis , Lectins/blood , Plant Extracts/analysis , Plant Extracts/immunology , Rabbits/bloodالملخص
Las lectinas son proteínas capaces de enlazar carbohidratos en forma específica y reversible. Debido a sus interesantes propiedades biológicas se ha mantenido la búsqueda, caracterización y estudio en semillas de la flora venezolana. Estas proteínas presentan estructura oligomérica con propiedades físico-químicas similares y homología estructural (isolectinas); sin embargo, existen lectinas monoméricas. Su función en las plantas no se conoce bien. Presentan actividad mitogénica sobre linfocitos cultivados in vitro y son capaces de aglutinar tanto leucocitos como eritrocitos. Polisacáridos ramificados como la goma arábiga, aumentan el título hemaglutinante de varias lectinas, particularmente aquellas altamente glicosidadas. Algunas lectinas son tóxicas sobre cultivos celulares, así la Concanavalina A causa la disminución de la incorporación de [3H]-timidina en células renales cultivadas in vitro. En Phaseolus vulgaris hay una clara relación entre especificidad hemaglutinante y toxicidad. Animales intubados o alimentados con semillas de las variedades tóxicas de P.vulgaris muestran daño en el borde estriado de las vellosidades del duodeno y yeyuno. La lectina de una varieda tóxica de P.vulgaris interfiere con la utilización de nutrientes a nivel intestinal, inhibe la digestión de carbohidratos de la dieta y la absorción de glucosa en el intestino
الموضوعات
Lectins/analysis , Lectins/history , Lectins/toxicityالموضوعات
Animals , Animal Feed , Fabaceae , Flour , Food Handling/methods , Swine/growth & development , Aminobutyrates/analysis , Animal Feed/analysis , Canavanine/analysis , Concanavalin A/analysis , English Abstract , Food Preservation/methods , Hemagglutination , Hot Temperature , Hydrogen-Ion Concentration , Lectins/analysis , Fabaceae/chemistry , Plant Extracts , Plants, Toxic/chemistry , Seeds/chemistryالملخص
Las algas marinas recolectadas en Túnez y Venezuela han sido analizadas buscando la presencia de lectinas, agentes antihemostáticos y compuestos Dragendorff positivo. De 34 especies estudiadas, la actividad de las lectinas fue demostrada en los extractos de 14 de ellas. De éstas, las especies consideradas de más valor para estudios posteriores fueron Halimeda tuna, H.opuntia, Bryotamnion triquetum, B. seaforthii, Codium isthmocladum y Centroceras clavulatum. La actividad anticoagulante fue detectada en extractos de 26 de las especies analizadas. El extracto con más actividad de potencia inhibidora fue el de Centroceras clavulatum, pero el de Codium isthmocladum también se consideró interesante. Once especies fueron estudiadas por su contenido de compuestos Drangendorff positivo. Tanto las betainas como el compuesto de sulfonio terciario del tipo 3-dimetilsulfoniopropinato (DMSP) o una mezcla de DMSP y una betaina fueron aisladas y caracterizadas en todas las especies analizadas