<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0864-0289</journal-id>
<journal-title><![CDATA[Revista Cubana de Hematología, Inmunología y Hemoterapia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Hematol Inmunol Hemoter]]></abbrev-journal-title>
<issn>0864-0289</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-02891999000200002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Aplicaciones de las lectinas]]></article-title>
<article-title xml:lang="en"><![CDATA[Applications of lectins]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Díaz]]></surname>
<given-names><![CDATA[Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martín González]]></surname>
<given-names><![CDATA[Odalys]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez de Pablos Vélez]]></surname>
<given-names><![CDATA[Yoryelín]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ganem Báez]]></surname>
<given-names><![CDATA[Félix A]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Laboratorios BETERA  ]]></institution>
<addr-line><![CDATA[Ciudad de La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>1999</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>1999</year>
</pub-date>
<volume>15</volume>
<numero>2</numero>
<fpage>91</fpage>
<lpage>95</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-02891999000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-02891999000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-02891999000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las lectinas constituyen un interesante grupo de proteínas de origen no inmune que comparten en común la propiedad de enlazarse de forma específica y reversible a carbohidratos, ya sean libres o que formen parte de estructuras más complejas. Contienen al menos 2 sitios de unión, de ahí que puedan enlazarse en primer lugar a un azúcar específico y en forma secundaria a una molécula glicosilada. Poseen interesantes propiedades que convierten a esta clase de proteínas en herramientas invalorables en los laboratorios biológicos, por lo que se utilizan en numerosas investigaciones que incluyen: estudio de la estructura de las membranas, detección de transformaciones malignas, purificación de glicoconjugados, estudios citogenéticos, así como también en ensayos histoquímicos, enzimáticos y en el tipaje de grupos sanguíneos]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Lectins are an interesting group of proteins of nonimmune origin that have the common property of binding in a specific and reversible way to carbohydrates, whether they are free or part of more complex structures. They have at least 2 binding sites that allow them to bind first to a specific sugar and then to a glycosylated molecule. They have interesting properties that turn this type of proteins into very valuable tools for biological laboratories, since they may be used in several investigations including the study of membrane structure, the detection of malignant transformations, the purification of glycoconjugates and the cytogenetic studies. They are also utilized in histochemical and enzymatic assays and in blood typing]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[LECTINAS]]></kwd>
<kwd lng="en"><![CDATA[LECTINS]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <h3> Laboratorios BETERA</h3><h2> Aplicaciones de las lectinas</h2><i>Lic. Patricia  Hern&aacute;ndez D&iacute;az, Lic. Odalys Mart&iacute;n Gonz&aacute;lez, Lic.  Yoryel&iacute;n Rodr&iacute;guez de Pablos V&eacute;lez y Dr. C. F&eacute;lix  A. Ganem B&aacute;ez</i> <h4> RESUMEN</h4>Las lectinas constituyen un interesante  grupo de prote&iacute;nas de origen no inmune que comparten en com&uacute;n la  propiedad de enlazarse de forma espec&iacute;fica y reversible a carbohidratos,  ya sean libres o que formen parte de estructuras m&aacute;s complejas. Contienen  al menos 2 sitios de uni&oacute;n, de ah&iacute; que puedan enlazarse en primer  lugar a un az&uacute;car espec&iacute;fico y en forma secundaria a una mol&eacute;cula  glicosilada. Poseen interesantes propiedades que convierten a esta clase de prote&iacute;nas  en herramientas invalorables en los laboratorios biol&oacute;gicos, por lo que  se utilizan en numerosas investigaciones que incluyen: estudio de la estructura  de las membranas, detecci&oacute;n de transformaciones malignas, purificaci&oacute;n  de glicoconjugados, estudios citogen&eacute;ticos, as&iacute; como tambi&eacute;n  en ensayos histoqu&iacute;micos, enzim&aacute;ticos y en el tipaje de grupos sangu&iacute;neos.      <p><i>Descriptores DeCS</i>: LECTINAS.     <p>El estudio de las lectinas fue iniciado  por <i>Stillmark</i> en 1888 al describrir el fen&oacute;meno de hemaglutinaci&oacute;n  con extractos de semillas de castor (<i>Ricinus communis</i>). La pro-te&iacute;na  responsable de la aglutinaci&oacute;n de los eritrocitos la denomin&oacute; Ricina.<sup>1,2</sup>  M&aacute;s tarde, <i>Hellin</i><sup>2</sup> descubri&oacute; que el extracto t&oacute;xico  de semillas de <i>Abrus precatorius</i> tambi&eacute;n pro-duc&iacute;a aglutinaci&oacute;n  de las c&eacute;lulas rojas, la prote&iacute;na responsable se denomin&oacute;  Abrina.     <p>A fines de los a&ntilde;os 40 <i>William C. Boyd</i> y <i>Rose M. Reguera</i><sup>2,3</sup>  reportaron que ciertas semillas conten&iacute;an aglutininas espec&iacute;ficas  para ant&iacute;genos de los grupos sangu&iacute;neos humanos.     <p>La primera lectina  que fue obtenida en forma cristalina fue la concanavalina A del frijol <i>Canavalia  ensiformis</i> en 1919 por <i>James B. Sumner</i>.<sup>3</sup>     <p>El t&eacute;rmino  lectinas fue introducido por <i>Boyd</i> y otros en 1954.<sup>4</sup> Su interpretaci&oacute;n  no ha sido uniforme debido al desconocimiento acerca de las funciones fisiol&oacute;gicas  de &eacute;stas. Existen diferentes proposiciones para definirlas, pero la m&aacute;s  aceptada es la siguiente: las lectinas son prote&iacute;nas o glicoprote&iacute;nas  de origen no inmune, fijadoras de carbohidratos con capacidad para aglutinar c&eacute;lulas  y precipitar glicoconjugados.<sup>5</sup>     <p>Cualquier definici&oacute;n deber&aacute;  tener en cuenta los aspectos siguientes:<sup>6</sup> <ul>     <li> Las lectinas son  glicoprote&iacute;nas.</li>    <li> No son de origen inmunol&oacute;gico.</li>    <li>  La relaci&oacute;n de las lectinas con varias glicoprote&iacute;nas que contienen  sitios de combinaci&oacute;n.</li>    ]]></body>
<body><![CDATA[</ul>Las lectinas est&aacute;n presentes en  casi todo lo vivo, pues se han encontrado en el reino vegetal, animal y en microorganismos.  En las plantas se han detectado, principalmente en los cotiledones y endospermos  de las semillas y constituyen del 2 al 10 % del total de las prote&iacute;nas  de &eacute;stas. En el reino animal se han encontrado en invertebrados, tales  como cangrejos, camarones, caracoles, lombrices y moluscos. Est&aacute;n presentes  fundamentalmente en la hemolinfa y &oacute;rganos sexuales.<sup>1,3</sup>     <p>La  gran importancia de las lectinas se debe fundamentalmente a sus propiedades biol&oacute;gicas,  tales como aglutinaci&oacute;n de eritrocitos y otras c&eacute;lulas como linfocitos,  espermatozoides, plaquetas y bacterias, inducci&oacute;n de mitosis en linfocitos,  efectos citot&oacute;xicos sobre linfocitos, aglutinaci&oacute;n de virus y otras.<sup>2-4</sup>  <h4> APLICACIONES</h4>Las lectinas se consideran armas valiosas en el campo de  la Gen&eacute;tica, la Biomedicina y la Inmunolog&iacute;a. Su utilidad est&aacute;  basada en la propiedad que tienen de combinarse con varios tipos de glicoconjugados  presentes en las superficies celulares y fluidos corporales.     <p>Sus propiedades  mitog&eacute;nicas permiten que se utilicen en estudios que tienen como base la  proliferaci&oacute;n de linfocitos en cultivos, como son: <ul>     <li> La evaluaci&oacute;n  de la producci&oacute;n de citoquinas (interfer&oacute;n e interleuquinas) y la  expresi&oacute;n de sus receptores en sobrenadantes de cultivos de linfocitos  provenientes de pacientes con enfermedades de alto impacto social como el s&iacute;ndrome  de inmunodeficiencia adquirida (SIDA), la tuberculosis y la leishmaniasis, entre  otras.<sup>7-12</sup></li>    <li> La caracterizaci&oacute;n de algunos aspectos relacionados  con la respuesta inmune y fen&oacute;menos asociados con ellas como la inmunosupresi&oacute;n.<sup>13,14</sup></li>    <li>  La interacci&oacute;n entre virus, como por ejemplo entre el virus de inmunodeficiencia  humana (VIH) y el virus de la hepatitis B, as&iacute; como la susceptibilidad  y resistencia a &eacute;stos<sup>15-18</sup></li>    <li> Evaluaci&oacute;n de la  efectividad de terapias antirretrovirales de acuerdo con la respuesta de los linfocitos  a la estimulaci&oacute;n con las lectinas antes y despu&eacute;s de la terapia,  como por ejemplo en terapias contra el VHI.<sup>19</sup></li>    <li> An&aacute;lisis  de funciones linfoproliferativas y citot&oacute;xicas en c&eacute;lulas mononucleares  causadas por algunas drogas.<sup>20</sup></li>    <li> Estudios acerca de la influencia  nutricional en la proliferaci&oacute;n de linfocitos y su cin&eacute;tica de proliferaci&oacute;n.<sup>12,21</sup></li>    <li>  La inducci&oacute;n de genes en linfocitos.<sup>22</sup></li>    ]]></body>
<body><![CDATA[<li> La detecci&oacute;n  de anormalidades cromos&oacute;micas.<sup>23</sup></li>    </ul>Actualmente se han  estudiado en detalle 9 lectinas con efecto mitog&eacute;nico sobre los linfocitos,  entre las que se destacan las provenientes de <i>Phaseolus vulgaris</i> (PHA),  <i>Canavalia ensiformis</i> (Con A), <i>Pisum sativum</i> (PSA) y <i>Fitolaca  americana</i> (PWM).     <p>Estos mit&oacute;genos pueden activar de forma diferente  los linfocitos T y B, por ejemplo la PHA y Con A inducen mitogenicidad en c&eacute;lulas  T, mientras que el mit&oacute;geno de carm&iacute;n (PWM) estimula ambos tipos  de c&eacute;lulas. No se conoce lectina alguna que estimule s&oacute;lo a los  linfocitos B humanos.<sup>2,3,12,16,19</sup>     <p>Las lectinas forman parte de conjugados  como lectina-lectina, lectina-enzimas y lectina-anticuerpos, lo que ha permitido  el desarrollo de t&eacute;cnicas cromatogr&aacute;ficas como la cromatograf&iacute;a  de afinidad para la purificaci&oacute;n de glicoprote&iacute;nas. Ejemplo de ellas  es la purificaci&oacute;n de IgG utilizando anti-IgG acoplada a la Con A-Sepharose  y la purificaci&oacute;n de IgM usando Con A-Sepharose,<sup>24</sup> as&iacute;  como tambi&eacute;n la purificaci&oacute;n de enzimas y de las propias lectinas.      <p>Las interacciones de estas prote&iacute;nas con c&eacute;lulas pueden ser inhibidas  en muchos casos por az&uacute;cares, por lo que se ha llegado a la conclusi&oacute;n  de que ellas se enlazan a sac&aacute;ridos de la superficie celular, lo que ha  provisto a los cient&iacute;ficos de &uacute;tiles marcadores para emplearlos  en t&eacute;cnicas histoqu&iacute;micas y en la microscopia electr&oacute;nica  para estudiar la estructura y funci&oacute;n de la membrana plasm&aacute;tica.  Generalmente se utilizan lectinas conjugadas con marcadores fluorescentes como  la biotina y las m&aacute;s usadas para estos fines son la PHA-L, PHA-E y las  provenientes de <i>Pisum sativum</i> (PSA), <i>Triticum vulgare</i> (WGA), <i>Solanum  tuberisum</i> (STL), <i>Arachis hypogae</i> (PNA), <i>Datura strmonium</i> (DSL),  <i>Lens culinaris</i> (LCA) y de <i>Griffonia simplicifolia</i> (GSL).<sup>1</sup>      <p>Dentro de los estudios de membrana se ha reportado en la literatura el uso  de lectinas para estudiar cambios estructurales en los glicoconjugados presentes  en las superficies celulares<sup>25</sup> y en ocasiones de esta forma detectar  cambios morfol&oacute;gicos ocurridos, para analizar la distribuci&oacute;n subcelular  de epitopes y terminales glico-proteicos,<sup>26-28</sup> adem&aacute;s para detectar  alteraciones en la expresi&oacute;n de mol&eacute;culas presentes en la superficie  celular.<sup>29-31</sup>     <p>Otra &aacute;rea importante en la cual se emplean  las lectinas es la detecci&oacute;n de trans-formaciones malignas en c&eacute;lulas,  a trav&eacute;s de la aglutinaci&oacute;n preferencial que muestran las lectinas  con c&eacute;lulas transformadas. Adem&aacute;s se han realizado investigaciones  para utilizar las lectinas y pol&iacute;meros sint&eacute;ticos enlazados a ellas  como agentes anticancer&iacute;genos <i>in vivo</i> e <i>in vitro</i>, ya que  se ha visto que disminuyen el crecimiento de las c&eacute;lulas tumorales. Se  utilizan tambi&eacute;n para la inmunizaci&oacute;n contra virus productores de  inmunodeficiencia y algunos tumores<sup>32-34</sup> y como medicamentos para prevenir  met&aacute;stasis.<sup>35</sup> Las propiedades citot&oacute;xicas de algunas  lectina como la Ricina y Abrina hacen tambi&eacute;n que &eacute;stas brinden  inter&eacute;s como potenciales armas terap&eacute;uticas en el tratamiento del  c&aacute;ncer humano.<sup>35</sup>     <p>Las lectinas se emplean igualmente en la  caracterizaci&oacute;n de grupos sangu&iacute;neos humanos, as&iacute; como en  la identificaci&oacute;n de nuevos grupos sangu&iacute;neos.     <p>Algunas de las  lectinas son espec&iacute;ficas en sus reacciones con los grupos sangu&iacute;neos  ABO, MN, A<sub>1</sub> y A<sub>2</sub> de humanos,<sup>2</sup> por esto han sido  utilizadas en la determinaci&oacute;n del tipo de sangre de los individuos. La  mayor&iacute;a de las lectinas aglutinan los eritrocitos de todos los grupos sangu&iacute;neos  en humanos y act&uacute;an a similares concentraciones, &eacute;stas son lectinas  no espec&iacute;ficas (no significa que no sea espec&iacute;fica a los az&uacute;cares);  el resto son lectinas espec&iacute;ficas. <h4> SUMMARY</h4>Lectins are an interesting  group of proteins of nonimmune origin that have the common property of binding  in a specific and reversible way to carbohydrates, whether they are free or part  of more complex structures. They have at least 2 binding sites that allow them  to bind first to a specific sugar and then to a glycosylated molecule. They have  interesting properties that turn this type of proteins into very valuable tools  for biological laboratories, since they may be used in several investigations  including the study of membrane structure, the detection of malignant transformations,  the purification of glycoconjugates and the cytogenetic studies. They are also  utilized in histochemical and enzymatic assays and in blood typing.     <p><i>Subject  headings</i>: LECTINS. <h4> REFERENCIAS BIBLIOGR&Aacute;FICAS</h4>    ]]></body>
<body><![CDATA[<P> 1. Hartmut  F. Advances in lectin research. Vol 1, Berl&iacute;n: Spring-Verlag, 1988.</P>    <!-- ref --><P>  2. Sharon N, Lis H. Lectins cell aglutinating and sugar-specific proteins. Science  1972;177:949-58.<!-- ref --><P> 3. --. Lectins. Chapman and Hall Press, Israel. 1980.<!-- ref --><P>  4. Boyd WC, Slapeigh E. Antigenic relations of blood group antigen as suggested  by test with lectins. Immunology 1954;73:226.<!-- ref --><P> 5. Goldstein IJ. What should  be called lectin. Nature 1980;285:66-8.<!-- ref --><P> 6. Frane H. Lectins definition  and classification. Acta Histochem 1982;71:19.<!-- ref --><P> 7. Born J, Uthgenannt D,  Dodt C, Nunnighoff D, Ringvol E. Citokine production and lymphocyte subpopulation  in aged humans. An assessment during nocturnal sleep. Mech Ageing Dev 1995;84(2):113-26.<!-- ref --><P>  8. Benyoucef S, Hober D, Shen L, Ajana F, Degroute D, Di Gerard Y, et al. INF  alpha production by whole blood from HIV-1 infected patients. Phatol Biol (Paris)  1996;44(5):393-6.<!-- ref --><P> 9. Erickson KL, Dimolfetto L, Wells RS, Reidarson T,  Stott JL, Ferrick DA. Development of an interleukin-2 receptor expression assay  and its use in evaluation of cellular immune response in blottlenose dolphin Tursiops  truncatus. J Weil Disc 1995;31(2):142-9.<!-- ref --><P> 10. Jurgens JB, Gartland LA, Du  Passquier L, Hurton JD, Gobel TW, Cooper MD. Identification of a candidate CD<sub>5</sub>  homologue in the amphobian Xenopuslea. Vis J Immunol Method 1995;155(9): 4218-23.<!-- ref --><P>  11. Mantovani G, Maccio A, Bianchi A. Megestrol acetate in neoplastic-anorexia/cahexia:  clinical evaluation and comparison with neoadjuvant chemotherapy. Int J Clin Lab  Res 1995;25(3):135-41.<!-- ref --><P> 12. Itichi S, Yamano Y, Osame M, Hall WW. A kinetic  comparative study on lymphocyte responses to superantigen and phytohemagglutinin:  reciprocal presentation of superantigen on surface of actived lymphocytes. Cell  Immunol 1996;173(2):312-6.<!-- ref --><P> 13. Baveja UK, Basack S, Thusoo TK. A study  of immune profile in human hydatid diseases. J Commun Disc 1995;27(2):61-6.<!-- ref --><P>  14. Segerson EC. Immunosuppresive activity of a porcine high molecular weight  uterine macromolecule is associated with transforming gowth factor-beta. J Reprod  Immunol 1995;29(1):47-60.<!-- ref --><P> 15. Cisterna R, Campelo C, Gorrino T, Malera  C, Sarria L. Association between HIV and another DNA virus in vitro. Eur J Clin  Microb Infect Disc 1995;14(7):591-6.<!-- ref --><P> 16. Garbuglia AR, Salvi R, Caro A,  Montella F, Disura F. Peripheral lymphocytes of clinically non progressor patients  harbur inactive and uninducible HIV proviruses. J Med Virol 1995;46(2):116-21.<!-- ref --><P>  17. Pernthaner A, Stankiewicz M, Bisset SA, Jonas WE, Cabaj W, Piulford HD. The  immune responsiveness of Romey sheep selected for resistence or susceptibility  to gastrointestinal nematodes. Lymphocyte blastogenic activity, eosinophilia and  total white blood cell counts. Int J Parasitol 1995;25(4):523-9.<!-- ref --><P> 18. Pinkston  P, Pellieter N, Arena C, Schick J, Garland R, Rose RM. Quantitative culture of  HIV-1 from bronchalveolar cells. Am J Respir Care Med 1995;152(1):2454-9.<!-- ref --><P>  19. Casseb JC, Bernand G, Saito R, Brigido LF, Joaquim ES, Duarte AJ. The value  of thelymphocyte proliferation test with phytohemagglutinin in the immune evaluation  of Brazilian HIV-infected patients. J Invest Allergi Clin Immunol 1995;5(6):347-9.<!-- ref --><P>  20. Lebrec H, Rober R, Blot C, Burlesun GR, Buhuon, Pallardy M. Immunotoxicological  investigation using pharmaceutical drugs. In vitro evaluation of immune effects  using rodent or human immune cells. Toxicology 1995;96(2):147-56.<!-- ref --><P> 21. Lahfa  FB, Dahmani Y, Trouthaud D, Deshaux D. Nutritional influences on in vitro splenin  lymphocyte proliferation in Psammomys obesus (Rodentia gerbilliadae). Cell Mol  Biol Res 1995;41(5):387-90.<!-- ref --><P> 22. Schwarz H, Valbracht J, Tuckwell J, Kempis  J, Kotz M. ILA, the human 4-IBB homologue, is inducible in lymphoid and other  cell lines. Cancer Lett 1995;107(2):285-91.<!-- ref --><P> 23. Tomasseti P, Cometa G,  Del Vecchio E, Baserga M. Chromosomal instability in multiple endocrine neoplasia  type 1. Cytogenetic evaluation with DEB test. Cancer Genet Cytogenet 1995;79(2):123-6.<!-- ref --><P>  24. Kong ZL, Chiang LC, Fang F, Shinohara K, Pan P. Immune bioactivity in shell  fish toward serum-free cultured human cell lines. Biosci Biotechnol Biochem 1997;61(1):24-8.<!-- ref --><P>  25. Peel S, Bulmer JC. Lectins hystochemistry of pregnat rat uterine tissues.  J Anat 1996;188(Pt 1):197-205.<!-- ref --><P> 26. Franceschini V, Lazzari M, Ciani F.  Identification of surface glycoconjugates in the olfactory system of turtle. Brain  Res 1996;725(1):81-7.<!-- ref --><P> 27. Qi X, Guy J. Localization of NADPH diaphorase/nitric  oxide synthase in the optic nerve of the normal guinea pig: a light and electron  microscopic study. J Comp Neurol 1996;370(3):396-404.<!-- ref --><P> 28. Yao Z, Fanslow  WC, Seldin MF, Rousseau AM, Painter SL, Comeau MR, et al. Herper-virus saimiri  encodes a new cytokine. IL-17 which binds to a novel cytokine receptor. Immunity  1995;3(6): 811-21.<!-- ref --><P> 29. Kato H, Kogure K, Araki J, Itoyama Y. Graded expression  of immunomolecules on activated microglia in the hippocampus following ischemic  tolerance. Brain Res 1995;694(1-2):85-93.<!-- ref --><P> 30. Zschabitz A, Krahn V, Gabius  HJ, Weiser H. Glycoconjugate expression of chrondocytes and perichondrium during  hyaline cartilage development in the rat. J Anat 1995;187(1):67-83.<P> 31.  Zschabitz A, Weiser H, Stofft E, Krahn V, Gagius HJ. Characterization of glycoconjugated  expression during development of Meckel cartilage in the rat. Anat Embriol Ber  1995b;191(1):47-9.</P>    <!-- ref --><P> 32. Brotchi J, Danguy A, Kiss R. Lectin histochemistry  of astrocytic tumors and in vitro characterization of lectin-induced modifications  on the proliferation of SW1088, U373 and U87 human astrocytic cell lines. J Neuro  Oncol 1997;34(2):111-22.<!-- ref --><P> 33. Hochstenbach SL, Ciriello J. Medullary pathways  mediating depressor responses from Na<sup>+</sup> sensivite sites in nucleus of  the solitary tract. Am J Physiol 1997;272(1-2):126-33.<!-- ref --><P> 34. Kiss R, Camby  I, Duckworth D, De-Deker R, Salmon I. In vitro influence of Phasseolus vulgaris,  Griffonia simplicifolia, Concanavalin A, wheat germ and peanut agglutinins on  HCT-15, LoVo and SW 837 human colorectal cancer cell growth. Gut 1997;40(2):253-61.<!-- ref --><P>  35. Tanda N, Mori S, Nose M, Saito T, Song ST, Sato A, et al. Expression of Phaseolus  vulgaris leukoagglutinin-binding oligosacharides in oral squamous cell carcinoma:  posible association with the metastatic potential. Pathol Int 1996;46(9):639-45.<br>Recibido: 15 de diciembre de 1998. Aprobado: 15 de enero de 1999.     <br>Lic.  <i>Patricia Hern&aacute;ndez D&iacute;az</i>. Laboratorios BETERA. Marianao, Ciudad  de La Habana, Cuba.       ]]></body><back>
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