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M5060-BC Pokeweed Mitogen (PWM)

M5060-BC
  
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      Übersicht

      Replacement Information
      Description
      OverviewVegetable lectins are particularly suitable for the stimulation of lymphocytes under in vitro conditions. An important mitogen group is the lectins, sugar-binding proteins. Lectins specifically bind to membrane-glycoproteins of different cells, including lymphocytes. They effect thereby agglutinations producing cell activation and proliferation. Vegetable agglutinins (mostly legumes) can party agglutinate erythrocytes according to the species and blood groups (therefore named phytohemagglutinins or lectins). This includes also Concanavalin A (Con A), a protein extracted from Canavalia ensiformis, which was found to effectively agglutinate human erythrocytes. Phytohemagglutinins (PHA) that mainly agglutinate erythrocytes are referred to as E, whereas PHA with lymphocytes stimulating properties as PHA L. Supplied as 6 x 5 ml.
      Specifications:

      Functional Test: Pass
      pH: 7.33-7.93
      Osmolality: 0.043-0.064 Osm/kg H20
      Agglutination Titre: 0.11-6.25 µg/ml
      Water Content: 0.5-5.0
      Color: Colorless
      Appearance: Clear
      Recommendations:

      Following re-constitution in 5 ml a. dest., apply 1 ml per 100 ml medium.

      Molecular basis of agglutination:
      Phytohemagglutinins do not have several binding sites for carbohydrate derivatives located in the cell membrane. For instance, Con A readily binds to mannose and glucose. PHA recognizes more complex oligosaccharides. By means of multiple binding, next-neighbour cells are agglutinated.

      Molecular basis of mitogenic stimulation:
      Lymphocytes proved to have an increased mitosis rate under the influence of this phytohemagglutinin.
      Binding of the mitogen to the cell membrane seems to increase the molecular/information flow between the cell and its environment. Increased membrane permeability activates the synthesis of proteins and nucleic acids. The synthesis rate for messenger substances like lymphokines (e.g. IL-2) is also increased.

      Nomenclature:
      Earlier nomenclature of phytohemagglutinines mostly referred to their purification level: PHA M, e.g., was named after residual content of mucoprotein, whereas PHA P indicated the pure protein. The recent nomenclature, however, rather refers to biological characteristics: PHA P preferrably agglutinizes erythrocytes, and is therefore now termed PHA E. PHA M was similarly re-named to PHA L, due to its particularly stimulating effect on lymphocytes.

      A routine test of the mitogen stimulation:
      Vegetable lectins are perfectly qualified for the stimulation of lymphocytes under in vitro-conditions. The activity of the single lectins here offered is regularly tested on peripheral human lymphocytes. Hereby a short stimulation (72 - 80 h) of the lymphocytes is effected by the respective lectin.
      The resulting blast transformation and the mitosis rate are quantitatively determined by the integration of radioactive marked DNA components (mostly 3H-thymidin). To identify the optimal stimulation data the following test system is applied:

      • Separation of humane lymphocytes by means of Biocoll separating centrifugation
      • 1 x 105 lymphocytes/ml test run (0.2 ml in micro test plates)
      • Culture medium: RPMI 1640 with 20 mM HEPES + 10% FBS, pre-tested FBS
      • Lectin: adding 10 µl/ml test run
      • Radioactive marking: 0.2 µCi 3H-thymidin per test run (spec. act. 2 Ci/mM
      • General culture time: 72 - 80 h at +37°C
      The processing and measuring of the radioactive marked lymphocytes are carried out by common methods. The substance quantities of the single lectins are set according to the results for maximum stimulation.
      Catalogue NumberM5060-BC
      Brand Family Calbiochem®
      References
      Product Information
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      Biological Information
      Physicochemical Information
      Dimensions
      Materials Information
      Toxicological Information
      Safety Information according to GHS
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      Product Usage Statements
      Storage and Shipping Information
      Ship Code Blue Ice Only
      Storage +2°C to +8°C
      Do not freeze Ok to freeze
      Packaging Information
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      Supplemental Information
      Specifications
      Global Trade Item Number
      Bestellnummer GTIN
      M5060-BC 0

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