WO2005012507A1 - Production of plant secondary metabolites using adsorption and elicitation in cell suspension culture - Google Patents
Production of plant secondary metabolites using adsorption and elicitation in cell suspension culture Download PDFInfo
- Publication number
- WO2005012507A1 WO2005012507A1 PCT/AU2004/000991 AU2004000991W WO2005012507A1 WO 2005012507 A1 WO2005012507 A1 WO 2005012507A1 AU 2004000991 W AU2004000991 W AU 2004000991W WO 2005012507 A1 WO2005012507 A1 WO 2005012507A1
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- WIPO (PCT)
- Prior art keywords
- adsorbent
- suspension culture
- elicitors
- culture
- secondary metabolite
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/0018—Culture media for cell or tissue culture
- C12N5/0025—Culture media for plant cell or plant tissue culture
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
- A01H4/00—Plant reproduction by tissue culture techniques ; Tissue culture techniques therefor
- A01H4/002—Culture media for tissue culture
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/04—Plant cells or tissues
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
- C12P7/22—Preparation of oxygen-containing organic compounds containing a hydroxy group aromatic
Definitions
- the present invention relates to methods of producing plant secondary metabolites, such as stilbenes, alkaloids, terpenoids, isoprenoids, phenylpropanoids, glucosinolates, steroids and pyretlirin compounds, by cell suspension culture of plant derived cells.
- the invention also relates to the plant secondary metabolite compounds produced by the methods of the invention.
- the invention relates to methods of 10 production of the stilbene compound resveratrol, and to the resveratrol so produced.
- Plants produce a wide range of "secondary metabolite compounds", which while having no
- secondary metabolites may function as pollinater attractants, may be produced in response to environmental stresses or may serve as chemical defences against microorganisms, insects and higher predators or even other plants.
- Common classes of secondary metabolites are compounds derived from glucose and acetyl-CoA which are
- pyrethrins and rotenone which are used in limited quantities in pesticides, and certain steroids and alkaloids that are used in pharmaceutical manufacture.
- Other secondary metabolites such as the diterpene esters (among which are phorbol derivatives) from the latices of various species of Euphorbia are potent irritants and carcinogens that are useful in the study of chemical carcinogenesis.
- plant secondary metabolite 0 compounds are complex organic species, which are unsuitable for production by chemical synthesis.
- a family of plant secondary metabolite compounds of particular interest to the present inventors is the stilbenes, which, as shown in the examples of stilbene structures depicted in figure 1, are characterised by the presence of two aromatic rings connected by a two carbon bridge.
- resveratrol is of particular importance as not only has it been demonstrated to have important pharmacological activity in the treatment of human conditions such as cancers, cardiovascular degenerative diseases, skin aging, diabetes, neurological diseases, eczema, acne, psoriasis, menopause and microbial and viral infections, but it may also be used as the basic skeleton for synthesis of a number of other stilbene compounds.
- figure 2 which outlines the biosynthetic pathway of resveratrol, resveratrol is directly biosynthesised from p-coumaroyl CoA and malonyl CoA.
- Resveratrol has been identified in at least 72 plant species. However, the most important dietary source is in the skins of red grapes such as Vitis vinifera, Vitis labrusca and Vitis muscadine, which are used to make wine. They are the most abundant natural sources of resveratrol with a content of 50-100 ⁇ g/g, based upon fresh weight of the grape skins, and about 1-3 mg/L, within red wine. As it is believed that a biologically effective daily allowance of resveratrol is in the range of 50-500 mg, it is not possible to derive such a dose simply from consumption of grapes or grape-derived products.
- Resveratrol and a number of the other stilbene compounds are considered to be phytoalexin compounds.
- Phytoalexins are a diverse group of fungitoxic, lipophilic, low molecular weight, secondary metabolites produced and accumulated in grape vines and other plants in non-selective response to various kinds of stresses, such as attack by fungal pathogens or exposure to ultraviolet radiation.
- Phytoalexins are supposedly synthesised and packaged into lipid vesicles to be transported to the sites of infection where they restrict pathogen growth. They are therefore induced in antifungal plants, such that they are not present in the healthy plants but are synthesised in response to pathogenic attack or stress.
- resveratrol rapidly accumulates in healthy tissues immediately surrounding the site of pathogen infection; in the case of resveratrol, infection by Botrytis cinerea.
- Resveratrol is generally stored in the form of glycosides within the cells in which it is produced (as outlined in Teguo P. W. et al. (1996) The accumulation of stilbene glycosides in Vitis vinifera cell suspension cultures. J. Nat. Prod. 59: 1189-1191), with the result that if enough resveratrol is produced in the vicinity of the infection, the spread of fungal infection will be halted.
- suspension cell culture systems involving elicitor agents such as jasmonic acid, salicylic acid, 3 -methyl-salicylic acid, betaine, /5-glucan, methyl-/3-cyclodextrin, chitosan and ethylene have demonstrated some success in increasing plant secondary metabolite (including resveratrol) production levels in suspension cell culture, the use of elicitation techniques has at best been effective to increase secondary metabolite production by several to a hundred fold. While this may sound impressive, due to the very low base level of production of resveratrol and other plant secondary metabolites, a hundred fold increase in production is generally not sufficient for commercial production purposes.
- elicitor agents such as jasmonic acid, salicylic acid, 3 -methyl-salicylic acid, betaine, /5-glucan, methyl-/3-cyclodextrin, chitosan and ethylene have demonstrated some success in increasing plant secondary metabolite (including resveratrol) production levels in suspension cell culture
- adsorbent materials in suspension cell culture as a means for improving yield of plant secondary metabolites.
- adsorbent materials such as AMBERLITE® XAD-7 have been applied to other plant cell culture systems, their use in the past has generally resulted in an enhanced production yield of several fold to several ten-fold, whereas the present inventors have been able to demonstrate increased yields in the order of one thousand to several thousand-fold.
- a method of producing a plant secondary metabolite of interest comprising: (a) cultivating by suspension culture in a suitable nutrient medium plant cells that produce the secondary metabolite; (b) including within the suspension culture an amount of adsorbent and one or more elicitor agents suitable to increase production of the secondary metabolite; (c) recovering the secondary metabolite from the suspension culture.
- the cells may be derived from regularly sub-cultured callus culture and/or suspension cell culture.
- the cells or those from which they are derived may have been subjected to genetic manipulation.
- the callus culture will have been established in a solidified callus induction medium from plant explants of a species that produces the secondary metabolite.
- japonica Liatris spicata, Primula japonica, Betula nigra, Filipendula vulgrais, Lobelia siphilitica, Grevillea robusta, Reseda luteola, Gentiana littoralia, Campanula carpatica, Ageratum conizoides, Psidium guajava, Ailanthus altissima, Hydrocotyle asiatica, Brugmansia suaveolens, Thymus pulegioides, Thymus lema-barona, Thymus serphyllum (wild), Gaultheria procumbens, Thymus camosus, Thymus tliracicus, Calycanthus floridus, Zin giber officinalis, Lamium dulcis, Thymus praecox "arcticus ", Thymus speciosa, Thymus pseudolamginosus, Thymus vulgraris, Ficus religiosa, Forsythia sus
- the cells may be derived from leaves, fruit, shoots, buds, flowers, bark, roots, branches, stems, seeds, cones, needles or cambium tissue of the plant.
- the cells are derived from meristematic plant tissue.
- the secondary metabolite is a stilbene compound.
- stilbene compounds encompassed by the invention include trans- resveratrol, cis-resveratrol, trans-piceid, cis-piceid, trans-resveratrol dehydrodimers, cis- resveratrol dehydrodimers, trans-pterostilbenes, cis-pterostilbenes, viniferins, trans- piceatannol, (3,5,5N,4N-tetrahydroxystilbene) 3-O- -glucoside (trans-astringin).
- the secondary metabolite produced is trans-resveratrol or cis-resveratrol.
- the secondary metabolite is an alkaloid compound, a terpenoid compound, an isoprenoid compound, a phenylpropanoid compound, a glucosinolate compound or a pyrethrin compound.
- Examples of such compounds that may be produced by methods of the invention include taxol, podophyllotoxin, indole alkaloids, ⁇ -carboline alkaloids, 10-hydroxy-N(alpha)-demethyl- 19,20-dehydroraumacline, terpenoid indole alkaloids, strictosidine, vallesamine, O-acetylvallesamine and voaphylline, campothecin, 3-oxo-rhazinilam, 10-hydroxycampothecin, maytansine, tripdiolide, harringtonine, homoharringtonine, isoharringtonine, braceantin, ellipticine, thalicarpine, indicine-N-oxide, baccharin, hyoscyamine, scopolamine, vinblastine, vincristine, catharanthine, vindoline, sanguinarine, norsanguinarine, valepotriates, atropine, quinidine,
- 9-dihydrobaccatin III derivatives 9-dihydrobaccatin III derivatives, rhazinilam, tubotaiwine, phenanthrofuran derivatives, ajuforrestine A, resperpine, codeine, thebaine, cryptopine, berberine, saponins, sapogenins, ginsenoside, rosmarimic acid, arbutin, ajmalicine, anthraquinones, artemesin, forskolin, shikonin, anthocyanins, diosgenin, ubiquinone- 10, serpentine, L-DOPA, pyrethrin, thiophene, 6-hydroxytaumacline, capsaicin, mine, serotonin.
- the sub-culturing mentioned above may be conducted weekly, fortnightly or monthly.
- the method of production is conducted in a batch process.
- the cultivating step may be between about two days and about several months in duration, preferably between about six days and about twenty days in duration and more preferably between about eight days and about sixteen days in duration.
- the production method is conducted in a semi- continuous or continuous process.
- the semi-continuous process may be operated in a fed-batch or a repeated-batch mode in which the cultivation duration may be between about two days to about several months, preferably between about six days and about twenty days in duration.
- the continuous process can be operated in a two-phase system in which the plant cells may be growing in a bioreactor system in either suspension or immobilization, and the medium is circulated between the bioreactor and an absorbant reservoir or resin column for secondary metabolite adsorption.
- the elicitor agents are selected from one or more of biotic elicitors, microbial fractions or products derived from biotic elicitors, and abiotic elicitors.
- elicitor agents include biotic elicitors such as: Botrytis cinerea Phytophthora megasperma, Pinellas stripticum, Oligosporas sp., Pythium mamiallatum, Pythium sylvaticum, Verticillium dahliae, Verticillium sp., Penicillium minioluteum, Phytophthora lateralis, Cytospora cincta, Cytospora leucostoma, Alternaria brassicicola, Alternaria solani, Alternaria cucumerina, Botrytis squamosa, Cochliobolus heterostrophus, Colletotrichum trifolii, Colletotrichum orbiculum, Colletotrichum graminicola, Colletotrichum gloeosporioides, Cylindrocladium floridanum, Fusarium crookwellense, Fusarium heterosporium, Fusarium oxysporam
- Geotrichum sp. Leptosphaeria torrae, Nectria haematococca MPVI, Mycosphaerella pinodes, Ophiostoma ulmi, Phoma lingam, Phoma pinodella, Phytophthora infestans, Pythium aristosporum, Pythium graminicola, Pythium ultimum, Rhizoctonia solani, Sclerotinia sp., S.
- nodoram D-45, Trametes versicolor, Ustilago maydis, Venturia inequalis; microbial fractions or products derived from biotic elicitors such as: Chitosan, Lichenan, Glucomannan, Pleuran, Glucan, Carboxymethylglucan, Hydroxymethylglucan, Sulfoethylglucan, Mannan, Xylan, Mannobiose, Mannotriose, Mannopentaose, Mannotetraose, Cellulysin, Multifect XL, Multifect CL, Resinase, Pulpxyme, SP431, Pectinol, Rapidase, Klerzyme, Chitinase; or abiotic elicitors such as: Arachidonic acid, Elaidic acid, Cyclic AMP, Dibutyrl Cyclic AMP, Methyl Jasmone, Cis-Jasmone, Jasmonic acid, /3-
- the elicitors will be provided within the suspension culture in a concentration of from about 0.01 ⁇ M to about 1 M, preferably in a concentration from about 1 ⁇ M to about 500 mM, more preferably in a concentration of between about 10 ⁇ M to about 200 mM and most preferably in a concentration of between about 50 ⁇ M and about 50 mM.
- the elicitors will be added to the suspension culture at a time from the inoculation time to any time during the culture duration, preferably at a time from the early exponential growth phase to the stationary phase, depending on the natures of the metabolites and the cell line of particular plant species.
- the adsorbent is included in the suspension culture in an amount of between about 1 g/L and about 500 g/L, preferably in an amount between about 20 g/L and about 300 g/L, more preferably in an amount of between about 50 g/L and 200 g/L.
- the adsorbent is added to the suspension culture between the inoculation to any time during the culture duration, preferably between the inoculation to the end of the exponential growth phase.
- the adsorbent is added in the suspension culture, in conjunction with one or a combination of elicitor agents at the same time or a different time during the cultivation, depending on the natures of the metabolites and the cell line of particular plant species.
- the nutrient medium comprises one or more of a carbon source, an organic nitrogen source, and inorganic nitrogen source, a macrosalt, a microsalt, a rare trace element, a vitamin, an organic supplement, a plant hormone, a hormone substitute or derivative, a hormone inhibitor, a synthetic growth regulator, a biosynthetic precursor, a metabolic inhibitor, a non-metabolic inhibitor, a stimulant, an activator, an anti-browning agent, an anti-oxidant, a stabiliser, an enhancer, a radical, a scavenger, a conditioner and a reducing agent.
- the adsorbent material is a macroporous non-ionic cross-linked polymeric material.
- the adsorbent is selected from one or more of Amberlite ® XAD7, Amberlite ® XAD2, Amberlite ® XAD7HP, Amberlite ® XAD4, Amberlite ® XAD16, Amberlite ® XAD1600, AMBERLITE®.
- AMBERLITE FP® Purasorb ® AP-250, Purasorb ® AP-400; Dowex ® L493, Dowex ® V493, Dowex ® L323, Diaion ® HP20, Diaion ® HP21, SEPABEADS ® SP207, SEPABEADS ® SP70, SEPABEADS ® SP700, SEPABEADS ® SP825, SEPABEADS ® SP850, Diaion ® HP2MG; SERDOLIT ® PAD I, SERDOLIT ® PAD II, SERDOLIT ® PAD III, SERDOLIT ® PAD IV, RP-8 (Merck), Charcoal, activated charcoal, Supelpak ® -2, Supel ⁇ ak ® -2B, Supelite ® DAX-8, Duolite ® XAD761, Dowex ® , Optipore ® L493, Poly(styrene-co-divinylbenzene), AMBER
- Preferred adsorbents include aliphatic adsorbents such as HP2MG and XAD-7, which are particularly preferred.
- the adsorbent is in the form of an immiscible liquid phase adsorbent.
- immiscible liquid phase adsorbents include, but are not limited to dimethyl siloxane polymer (Silicone antifoam A), polymethoxy silanes (also known as silicone oils), long chain or branched (eg. having at least 8 and preferably having 12 to 20 carbon atoms) alkane adsorbents such as hexadecane and glycol or polyol adsorbents such as Myglyol.
- the secondary metabolite is recovered in an amount at least 800-fold increased relative to a comparable method of production where adsorbent and elicitor are not included in the suspension culture.
- the recovery of the secondary metabolite is increased at least 1000-fold, more preferably at least 1200-fold and more preferably at least 1500-fold and particularly preferably at least 3000-fold.
- the stilbene is trans-resveratrol, cis-resveratrol, trans-piceid, cis-piceid, trans- resveratrol dehydrodimers, cis-resveratrol dehydrodimers, trans-pterostilbenes, cis- pterostilbenes, viniferins, trans-piceatannol, (3,5,5N,4N-tetrahydroxystilbene) 3-0-/3- glucoside (trans-astringin).
- the recovery of the secondary metabolite from the suspension culture is achieved by isolating the secondary metabolite from the cells, the adsorbent and the nutrient medium utilising solvent extraction with a suitable solvent.
- the present invention relates to the secondary metabolite product produced by the methods outlined above. According to a further embodiment of the present invention there is provided a method of producing a stilbene plant secondary metabolite of interest, comprising:
- the plant cells are derived from Vitis vinifera or Polygonum cuspidatum.
- the adsorbent included within the suspension culture is AMBERLITE® XAD-7, preferably provided in an amount of between about 1 g/L to about 500 g/L, more preferably between about 20 g/L to about 300g/L, particularly preferably between about 50 g/L and about 200 g/L.
- the one or more elicitor agents is/are selected from jasmonic acid, salicylic acid, chitosan and /5-glucan.
- Figure 1 shows chemical structures of trans/cis-resveratrol and several other stilbene phytoalexins.
- Figure 2 shows the biosynthetic pathway of resveratrol.
- Figure 3 shows an HPLC chromatogram of lOOx concentrated medium extract, the arrow indicates the resveratrol peak and the insert indicates the UV/Vis spectrum of resveratrol.
- Figure 4 shows the effect of various amounts of XAD-7 added into the medium at day 0, on the production of resveratrol in the culture at day 7.
- Figure 5 shows the effect of 10 g/L XAD-7 added into the medium at day 0 on the cell growth of Vitis vinifera cell culture.
- Figure 6 shows an HPLC chromatogram for XAD-7 experiment, red is extract from cells and XAD-7, blue is extract from XAD-7 alone.
- Figure 7 shows the kinetics of resveratrol production in the culture where the V. vinifera cells grew with 10 g/L XAD-7 added to the medium.
- Figure 8 shows the effect of various elicitors and elicitor combinations on intracellular resveratrol production.
- Treatments tested include: (1) None (control 1 without the addition of elicitors and solvents); (2) EtOH + H 2 O (solvent control for jasmonic acid elicitation); (3) 10 JA+H 2 O (10 ⁇ M Jasmonic acid in solvent); (4) 20 JA+H 2 O (20 ⁇ M Jasmonic acid in solvent); (5) 1 GLU+EtOH50 (1 mg/L ⁇ -glucan in solvent); (6) 1 GLU+10 JA (1 mg/L ⁇ -glucan + 10 ⁇ M jasmonic acid); (7) 1 GLU+20 JA (1 mg/L ⁇ -glucan + 20 ⁇ M jasmonic acid); (8) CH 3 COOH (solvent control for Chitosan); (9) 5 Chitosan (5 mg/L Chitosan);
- Figure 9 shows the effect of various elicitors and elicitor combinations on extracellular resveratrol production in the medium on day 7 and day 10.
- Treatments tested include: (1) None (control 1 without the addition of elicitors and solvents); (2) EtOH (solvent control); (3) 1 ⁇ g/ml GLU (1 mg/L ⁇ -glucan in solvent); (4) lO ⁇ M JA (10 ⁇ M jasmonic acid); (5) 20 ⁇ M JA (20 ⁇ M jasmonic acid; (6) I ⁇ g/ml GLU +10 JA (1 mg/L ⁇ -glucan + 10 ⁇ M Jasmonic acid); (7) l ⁇ g/ml GLU +20 JA (1 mg/L ⁇ -glucan + 20 ⁇ M Jasmonic acid).
- Figure 10 shows the effect of various amounts of XAD-7 added into the medium at day 0, on the production of resveratrol in the culture (extracted from the XAD-7 beads) at day 7.
- Figure 11 shows the effect of the combined treatments of XAD-7 and elicitors on cell growth on day 4, 7 and 10.
- Treatments tested include: (1) 20XAD-7 (20 g/L XAD-7); (2) 20XAD-7 + GLU+JA (20 g/L XAD-7 + 1 mg/L ⁇ -glucan + 10 ⁇ M jasmonic acid); (3) 20CTRL (20 g/L XAD-7 + solvents); (4) 200XAD-7 (200 g/L XAD-7); (5) 200XAD-7 + GLU+JA(200 g/L XAD-7 + 1 mg/L ⁇ -glucan + 10 ⁇ M jasmonic acid); (6) 200CTRL (200 g/L XAD-7 + solvents).
- Figure 12 shows the effect of the combined treatments of XAD-7 and elicitors on resveratrol content per gram of fresh cells + XAD-7 adsorbent on day 4, 7 and 10.
- Treatments tested include: (1) CTRL (control 1 without the addition of elicitors and solvents); (2) 10 JA (10 ⁇ M jasmonic acid); (3) 20 JA (20 ⁇ M jasmonic acid; (4) GLU (1 mg/L ⁇ -glucan in solvent); (5) GLU +10 JA (1 mg/L ⁇ -glucan + 10 ⁇ M Jasmonic acid); (6) GLU +20 JA (1 mg/L ⁇ -glucan + 20 ⁇ M Jasmonic acid); (7) 20XAD-7 (20 g/L XAD- 7); (8) 20XAD-7 + GLU+JA(20 g/L XAD-7 + 1 mg/L ⁇ -glucan + 10 ⁇ M jasmonic acid); (9) 20CTRL (20 g/L XAD-7 + solvents); (
- Figure 13 shows the effect of the combined treatments of XAD-7 and elicitors on resveratrol yield on day 4, 7 and 10. All treatments tested as described in Figure 12.
- Figure 14 shows an HPLC chromatogram for the extracts from both cells and XAD-7 beads in the experiment of combined treatments of 20 g/L XAD-7, and 1 mg/L ⁇ -glucan and 10 ⁇ M jasmonic acid and the inserts indicate the UV / Vis spectrum for the resveratrol peak.
- Figure 15 shows a bar graph of resveratrol production (mg/L) in FU-04 cell culture using one of several different adsorbent materials, where resveratrol was extracted from the adsorbent resin on the basis of a first extraction only and where samples were taken from the cell culture at 7 days (lightly shaded) and 10 days (darkly shaded).
- Figure 16 shows a bar graph of resveratrol production (mg/L) in FU-04 cell culture using one of several different adsorbent materials, where resveratrol was extracted from the adsorbent resin on the basis of a first extraction only and where samples were taken from the cell culture at 7 days (lightly shaded) and 10 days (darkly shaded).
- Figure 17 shows a bar graph of phenolic compound production (mg/L) in FU-04 cell culture using one of several different elicitor treatments at day 4, where samples were taken from the cell culture at 7 days (lightly shaded) and 10 days (darkly shaded).
- Figure 18 shows a bar graph of resveratrol production (mg/L) in FU-04 cell culture using one of several different elicitor treatments at day 4, where samples were taken from the cell culture at 7 days (lightly shaded) and 10 days (darkly shaded).
- Figure 19 shows a bar graph of cell growth (dry cell weight) in Vitis vinifera FU-04 cell culture using XAD-7 as adsorbent and one of several different elicitor treatments as described in Table 11, where samples were taken from the cell culture at 4 days (lightly shaded - control), 7 days (darkly shaded) and 10 days (unshaded).
- Figure 20 shows a bar graph of total phenolic compound production (mg/L) in Vitis vinifera FU-04 cell culture using XAD-7 as adsorbent and one of several different elicitor treatments as described in Table 11, where samples were taken from the cell culture at 4 days (lightly shaded - control), 7 days (darkly shaded) and 10 days (unshaded).
- Figure 21 shows a bar graph of resveratrol production (mg/L) in Vitis vinifera FU-04 cell culture using XAD-7 as adsorbent and one of several different elicitor treatments as described in Table 11, where samples were taken from the cell culture at 4 days (lightly shaded - control), 7 days (darkly shaded) and 10 days (unshaded).
- the present invention provides methods of producing plant secondary metabolites of interest.
- these compounds of interest will be secondary metabolite compounds that are known to be produced within plants and which, as a result of their identified properties, are of commercial value, for example as pharmaceutical agents, fragrances, food or beverage ingredients, precursors for chemical synthesis, ingredients in industrial products such as pesticides, herbicides, fungicides, anti-bacterial or anti-viral agents, or the like.
- plant secondary metabolites are compounds produced in plant cells that have no apparent function in the plant's primary metabolism, but may have a secondary activity.
- Examples of classes of chemical compounds that fall under the banner of secondary metabolites include stilbene compounds, such as trans-resveratrol, cis-resveratrol, trans- piceid, cis-piceid, trans-resveratrol dehydrodimers, cis-resveratrol dehydrodimers, trans- pterostilbenes, cis-ptero stilbenes, viniferins, trans-piceatannol, (3,5,5N,4N- tetrahydroxystilbene) 3-O-/5-glucoside (trans-astringin); and alkaloid compounds, terpenoid compounds, isoprenoid compounds, phenylpropanoid compounds, glucosinolate compounds and pyrethrin compounds, such as taxol, podophyllotoxin, indole alkaloids, ⁇ - carboline alkaloids, 10-hydroxy-N(alpha)-demethyl-19,20-dehydroraumacline,
- the production method will be established by cultivating a suspension cell culture of plant cells either derived from a plant known to produce the secondary metabolite of interest or from plant cells that have been genetically manipulated in order to produce the secondary metabolite of interest.
- the plant cells may be derived from a wide variety of plant species such as those listed above, although not limited to those listed species.
- An appropriate plant cell line may be established by initiating a callus culture from plant explants in a suitable solidified medium, followed by somoclonal selection. In the case of Vitis vinifera cv. Gamay Freaux (FU-1) callus culture may for example be initiated using young berries.
- a suitable medium such as a modified B5 medium [O.L. Gamborg, R.A. Miller, K.
- portions of established callus may be placed in the above mentioned appropriate liquid medium (e.g. liquid modified B5 medium) without agar.
- the suspension culture is preferably subcultured weekly in the dark, for example in 250 ml Erlenmeyer flasks enclosed with aluminum foil containing approximately 50 ml of the medium.
- the inoculum size may be approximately 2.5 g wet cells per 50 ml medium prepared by filtering pre-cultured 7-day old suspension cells with a 50 ⁇ m stainless steel mesh (for example, Endecotts Ltd., London, England).
- the subcultures may be maintained on a reciprocating shaker (100 strokes/min) at 27 ⁇ 1°C in a temperature-controlled incubator.
- the plant explants that are used to establish the cell line may be derived from a wide variety of plant tissue including, but not limited to, leaves, fruit, shoots, buds, flowers, bark, roots, branches, stems, seeds, cones, needles or cambium tissue of the plant.
- the most preferred explant material that may be utilised for establishment of a plant cell line may be derived from meristematic plant tissue (characterised by high levels of the metabolite of interest), which encompasses regions of plant tissue characterised by rapid cellular division and growth.
- nucleic acid sequences encoding peptides or proteins of interest may be manipulated and incorporated within cells in accordance with conventional molecular biology techniques, such as for example outlined in Sambrook and Russell, Molecular Cloning: A Laboratory Manual, Third Edition, Cold Spring Harbour Laboratory Press, Cold Spring Harbour, New York.
- the plant tissue should be surface-sterilised prior to introduction into the callus induction medium.
- Conventional sterilisation techniques such as the use of 70%o ethanol, 15% sodium hypochlorite and "Chlorox" (a trade mark owned by the Chlorox company for bleach) treatment would be effective.
- antimicrobial agents such as cefoxitin, benlate, cloxacillin, ampicillin, gentamycin sulphate and phosphomycin may be used for surface sterilisation of plant material.
- the explants taken from the plant may be utilised to establish a callus culture.
- the term "callus” is used to describe a mass of cultured plant cells that is structurally undifferentiated, and is cultured on a solidified medium. Cells derived from a callus culture may be utilised to establish a suspension culture.
- "Suspension culture” is used to describe structurally undifferentiated cells that are dispersed in a liquid nutrient medium. It is understood that suspension cultures comprise cells in various stages of aggregation. A range of aggregate sizes are encountered in the suspensions described in this invention, with sizes ranging from tens of microns in diameter (single cells or few-aggregated cells) to aggregates many millimetres in diameter, consisting of many thousands of cells.
- Callus cultures will typically exhibit variability in growth morphology, productivity, product profiles and other characteristics. Since individual cell lines vary in their preferences for growth medium constituents, many different growth media may be used for induction and proliferation of the callus.
- the appropriate medium composition varies depending upon the species being cultured. Examples of media that may be suitable are listed in Table 1. Growth hormones or regulators may additionally be incorporated within the callus culture medium, for example in an amoimt between about 1 ppb to 10 ppm, preferably between about 2 ppb to about 1 ppm. Amounts of other medium ingredients can be varied from the levels outlined in Table 1 ; for example from one tenth concentration to three times the concentrations indicated in the table.
- Plant suspension cultures are capable of rapid growth rates and high cell densities. However, optimal conditions vary from one cell line to another, and accordingly, methods leading towards rapid optimisation for any given cell line must be considered.
- the initial cultures of various species may be sub-cultured by transfer into suitable suspension culture nutrient medium. Examples of media suitable for culture of Vitis species cells are provided in Tables 2 to 5, with reference to the B5 stock solutions outlined in Table 6 and the MS microsalt and SM macrosalt solutions outlined in Tables 7A and 7B, respectively. Such media will contain macro and micro nutrients, organic salts and growth hormones.
- the amount of the ingredients included within the suspension culture nutrient medium will generally be within one tenth concentration to three times the concentration of the exemplary concentrations provided in Table 2.
- the nutrient medium selected may include one or more of a carbon source, an organic nitrogen source, an inorganic nitrogen source, a macrosalt, a microsalt, a rare trace element, a vitamin, an organic supplement, a plant hormone, a hormone substitute or derivative, a hormone inhibitor, a synthetic growth regulator, a biosynthetic precursor, a metabolic inhibitor, a non-metabolic inhibitor, a stimulant, an activator, an anti-browning agent, an anti-oxidant, a stabiliser, an enhancer, a radical or scavenger, a conditioner and a reducing agent.
- antioxidants in the nutrient medium are referred to by special names in this invention, and are defined here.
- anti-browning agents refer to components that are added to the nutrient medium to prevent the formation of pigments during cell cultivation. These pigments include phenolics and related compounds that are generally observed to have a deleterious effect on cell growth, viability, and production formation.
- biosynthetic precursors are used to describe compounds added to the nutrient medium that are metabolised and incorporated by the cells into the metabolites of interest (for example resveratrol).
- metabolic inhibitors is used to describe compounds added to the nutrient medium that interfere with specific biosynthetic pathways.
- a metabolic inhibitor may be used to enhance biosynthesis by blocking a different pathway that competes with secondary metabolite for an early biosynthetic precursor.
- stimulator or activator is used to describe compounds added to the nutrient medium that stimulate or activate specific biosynthetic pathways, for example those leading to biosynthesis. It is understood that the mechanism of action of the additives described herein may not be completely understood.
- gaseous components primarily oxygen, carbon dioxide, and ethylene (a plant hormone)
- oxygen, carbon dioxide, and ethylene a plant hormone
- ethylene a plant hormone
- Two parameters are important.
- the dissolved gas concentrations favouring growth and secondary metabolite formation are obviously important since they dictate reactor operating conditions.
- the rates of consumption or production need to be incorporated into reactor design, so that the optimum specified concentrations can be maintained.
- Biosynthesis of secondary metabolites may also be stimulated by medium exchange, perhaps due to removal of the product to thereby prevent feedback inhibition and product degradation.
- the periodic removal of spent medium incorporates production yield advantages, and additionally, may serve to depress secondary biosynthesis by removing other, non-desired secondary metabolites which exhibit an inhibitory activity.
- the replenishment of fresh medium to cells undergoing active biosynthesis may also enhance production by providing essential nutrients that have been depleted. It is to be recognised that the amount of medium exchange, the frequency of exchange, and the composition of the medium being replenished may be varied, depending upon the specific circumstances. For example, medium may be exchanged on a continuous or periodic basis, such as for example hourly, daily, on alternate days or weekly.
- the liquid cultures are exposed to air and preferably shaken and otherwise gently moved to introduce air into the medium, or air may be introduced through tubing into the culture vessel.
- the cultures are maintained under appropriate growth conditions at a temperature preferably between about 10°C to 40°C, more preferably between about 15°C to 30°C.
- the pH may be from between about 3 to about 7.5 and preferably between about 4 to about 6.
- the culture may be grown under light conditions ranging from total darkness to total light (narrow band and/or broad spectrum) for various periods of time. The culture conditions will of course be varied depending upon the plant cell species being cultured and upon the secondary metabolite or metabolites of interest.
- production yields may be improved by lower or higher pH, lower or higher temperature or conditions of light or darkness.
- the nutrient medium in the case of production of resveratrol in Vitis vinifera species derived cells it is preferred for the nutrient medium to be adjusted to a pH of between about 5 and about 6.5, preferably about 5.7 or 5.8, and for the cultures to be incubated at a temperature of between about 24°C and about 28°C, preferably at about 26°C. It is preferred for light to be excluded.
- callus and/or suspension cultures are regularly sub-cultured, for example on a weekly, fortnightly or monthly basis.
- a key aspect of the present invention which results in significant increases in secondary metabolite yield, relative to plant cell suspension cultures without this feature, is the incorporation or inclusion within the suspension culture of an adsorbent, in conjunction with the addition of one or more elicitor agents.
- the adsorbent agents generally adopted may be in the solid form or may take the form of an immiscible liquid.
- Adsorbent agents are well known and readily commercially available and are characterised by the taking up of a substance or substances on their surface (or at the interface between liquids in the case of immiscible liquid adsorbents), for example by ionic, dipole-dipole interactions, hydrogen bonding or physical interactions, for example.
- the adsorbent agents adopted in the present invention are preferably those that demonstrate adsorption of the secondary metabolite compound of interest.
- the adsorbent agent or agents included within the suspension culture will be selected on the basis of the nature of the secondary metabolite of interest and the arrangement of the culture system.
- Adsorbent agents vary widely in their characteristics, such as size, binding characteristics and pore diameter (if any). Examples of preferred adsorbent agents include, but are not limited to, the following: Amberlite ® XAD7, Amberlite ® XAD2, Amberlite ® XAD7HP, Amberlite ® XAD4, Amberlite ® XAD16, Amberlite ® XAD1600, AMBERLITE®.
- AMBERLITE FP® Purasorb ® AP-250, Purasorb ® AP-400, Dowex ® L493, Dowex ® V493, Dowex ® L323, Diaion ® HP20, Diaion ® HP21, SEPABEADS ® SP207, SEPABEADS ® SP70, SEPABEADS ® SP700, SEPABEADS ® SP825, SEPABEADS ® SP850, Diaion ® HP2MG; SERDOLIT ® PAD I, SERDOLIT ® PAD II, SERDOLIT ® PAD III, SERDOLIT ® PAD IV, RP-8 (Merck), Charcoal, activated charcoal, Supelpak ® -2, Supelpak ® -2B, Supelite ® DAX-8, Duolite ® XAD761, Dowex ® Optipore ® L493, Poly(styrene-co- divinylbenzene).
- AMBERLITE® XAD-7 is a non-ionic polymeric adsorbent with surface area of 450 m 2 /g and average pore diameter of 90 A, which is commercially available from Sigma- Aldrich.
- adsorbents include aliphatic adsorbents and particularly preferrred aliphatic adsorbents are HP2MG and XAD-7.
- Diaion ® HP2MG is a highly porous methylacrylate based adsorption resin with a pore volume of 1.2 ml/g and a surface area of 470 meters 2 per gram, and is obtained from Mitsubishi Chemical Company.
- immiscible liquid phase adsorbents include, but are not limited to dimethyl siloxane polymer (Silicone antifoam A), polymethoxy silanes (also known as silicone oils), long chain or branched (eg. having at least 8 and preferably having 12 to 20 carbon atoms) alkane adsorbents such as hexadecane and glycol or polyol adsorbents such as Myglyol.
- the adsorbent material may be provided in an amount of between about 1 g/L to about 500 g/L, preferably between about 20 g/L to about 300 g/L, and particularly preferably between about 50 g/L and about 200 g/L.
- AMBERLITE® XAD-7 (which is often referred to herein as simply "XAD-7") and dimethyl siloxane polymer.
- the amount of adsorbent agent included within the suspension culture will depend upon the secondary metabolite of interest and will most usually be selected on the basis of maximum secondary metabolite production. The inventors have found that upon increasing amounts of adsorbent a threshold amount will be reached, above which yield of the secondary metabolite does not significantly further increase. The optimum type and amount of adsorbent and elicitor agent can readily be determined by conducting trial cultures, as for example outlined in examples 1 and 2.
- the amount and type of adsorbent and elicitor incorporated in the suspension culture will result in an at least 800-fold increase in secondary metabolite yield relative to a comparable suspension culture which does not include adsorbent and elicitor.
- the yield is increased at least 1, 000-fold, more preferably at least 1, 200-fold and particularly preferably at least 1, 500-fold.
- the adsorbent may be included directly in the culture.
- it may be included in a column, membrane or other physical or chemical barrier that is immersed within the culture or is in liquid communication with medium extracted from the culture.
- barrier there is some form of barrier present, which substantially excludes accumulation of cells in or about the adsorbent, to thereby allow maximal interaction between the adsorbent and the medium.
- the secondary metabolite is substantially removed from the cells and preferably from other components of the culture such as the adsorbent, elicitor and other culture additives.
- the recovery step or steps results in secondary metabolite or secondary metabolites as a suspension, precipitate, solute, oil, crystalline or amorphous form substantially isolated from other culture components and with a level of purity of preferably at least 5%, more preferably at least 20%, particularly preferably at least 50%, more preferably at least 70%, 80%, 90% or 95% and most preferably at least 98%. Purity can readily be assessed by routine methods.
- the yield of the secondary metabolite produced according to the suspension cell culture method is also increased by including within the suspension culture one or more elicitors.
- elicitor encompasses compounds of biological and non-biological origin that cause an increase in secondary metabolite production when applied to plants or plant-cell cultures. Many different and diverse compounds can act as elicitors, depending upon their nature of origin and their mode of action with cellular metabolism.
- elicitors may be characterised into classes of biotic elicitors, which for example include the following: Botrytis cinerea Phytophthora megasperma, Pinellas stripticum, Oligosporas sp., Pythium mamiallatum, Pythium sylvaticum, Verticillium dahliae, Verticillium sp., Penicillium minioluteum, Phytophthora lateralis, Cytospora cincta, Cytospora leucostoma, Alternaria brassicicola, Alternaria solani, Alternaria cucumerina, Botrytis squamosa, Cochliobolus heterostrophus, Colletotrichum trifolii, Colletotrichum orbiculum, Colletotrichum graminicola, Colletotrichum gloeosporioides, Cylindrocladium floridanum, Fusarium crookwellense, Fusarium hetero, Fu
- Geotrichum sp. Leptosphaeria torrae, Nectria haematococca MPVI, Mycosphaerella pinodes, Ophiostoma ulmi, Phoma lingam, Phoma pinodella, Phytophthora infestans, Pythium aristosporam, Pythium graminicola, Pythium ultimum, Rhizoctonia solani, Sclerotinia sp., S.
- nodorum D-45 Trametes versicolor, Ustilago maydis, Venturia inequalis; microbial fractions or products derived from biotic elicitors:: Chitosan, Lichenan, Glucomannan, Pleuran, Glucan, Carboxymethylglucan, Hydroxymethylglucan, Sulfoethylglucan, Mannan, Xylan, Mannobiose, Mannotriose, Mannopentaose, Mannotetraose, Cellulysin, Multifect XL, Multifect CL, Resinase, Pulpxyme, SP431, Pectinol, Rapidase, Klerzyme, Chitinase; and abiotic elicitors: Arachidonic acid, Elaidic acid, Cyclic AMP, Dibutyrl Cyclic AMP, Methyl Jasmone, Cis-Jasmone, Miconazol, Feralic acid, AMO-16
- elicitors mentioned above have been mentioned by way of example only, and are not intended to be limiting upon the scope of the invention.
- Particularly preferred elicitors include jasmonic acid, salicylic acid, chitosan and /3-glucan.
- Elicitors may be provided within the suspension culture in a concentration of from about 0.01 ⁇ M to about 1 M, preferably in a concentration from about 1 ⁇ M to about 500 mM, more preferably in a concentration of between about 10 ⁇ M to about 200 mM and most preferably in a concentration of between about 50 ⁇ M and about 50 mM, depending on the nature of the metabolite of interest and the cell line of the particular plant species adopted.
- Elicitors interact with dissolved gasses in many ways. Oxygen requirements may change upon elicitation. Increases in respiration rate as a wound response is commonly observed in plant cell culture. Importantly, elicitors may mediate their action via ethylene.
- a microbial elicitor preparation with ethylene, and perhaps prevent toxicity associated with other microbial components in the elicitor preparation.
- Elicitors and metabolic stress agents may be utilised according to the invention to maximise secondary metabolite production and secretion in cell suspension culture by assessing elicitor specificity and concentration, timing, and duration, as a function of culture age and media composition.
- a second or subsequent addition of the elicitor/s into the suspension culture may be made at a time from about six hours to about a month in duration after the previous elicitation, more preferably at a time from about twelve hours to about two weeks in duration after the previous elicitation, and most preferably at a time from about 12 hours to about 7 days in duration after the previous elicitation. It may also be appropriate to initially add an elicitor some time after the suspension culture has been established, for example a matter of one to several hours later or 1 , 2, 4 or 6 days after suspension culture cultivation has commenced.
- the operating mode for a plant cell culture process refers to the way that nutrients, cells and products are added or removed with respect to time. When all the nutrients are supplied initially, and the culture contents comprising cells and product are harvested at the end of the culture period, the operating mode is termed a "one-stage batch process". When a batch process is divided into two sequential phases, a growth and production phase, with the medium being exchanged in between the two phases, the operating mode is termed a "two-stage batch process".
- the suspension culture will be allowed to cultivate for an appropriate period of time, such as for example between about 2 days and several months in duration, preferably between about 6 days and about 1 month in duration and more preferably between about 7 days and about 16 days.
- an appropriate cultivation period when a batch process is adopted, which will be determined depending upon the nature of the secondary metabolite and the cell line concerned, the secondary metabolite will be recovered from the suspension culture.
- the cells and adsorbent may be harvested from the nutrient medium by removal of the medium, such as for example by filtration and the cell layer and adsorbent are separated. It may be appropriate to wash the adsorbent material with water to remove unwanted cellular material and medium components and a drying step may also be adopted.
- a solvent extraction process may be adopted, in a suitable solvent material selected on the basis of the nature of the adsorbent and secondary metabolite.
- the solvent is preferably an organic solvent such as methanol, methanoic acid, ethanol, acetic acid, ethyl acetate, acetone, methyl acetate.
- a preferred extraction solvent is methanol.
- Extraction of the secondary metabolite may be conducted using conventional methods and over an appropriate period of time, such as between about 10 minutes and 24 hours, preferably between about 30 minutes and about 12 hours, more preferably for between about 1 hour to 6 hours, in between about 5 and about 50 volumes, preferably between about 10 and about 30 volumes, and more preferably in about 20 volumes of solvent relative to the volume of the cells and adsorbent. Second or multiple extraction may be required depending on the nature of the metabolites of interest and the concentration of the metabolites within the cells and adsorbents.
- barrier provided to avoid excessive direct interaction between the adsorbent and the cells, especially in the case where a continuous process is adopted.
- the adsorbent is retained in a separate receptacle into and through which medium is pumped and optionally then returned to the culture vessel.
- a barrier or filter would be provided to prevent ingress of cells into the adsorbent receptacle and to prevent egress of adsorbent back to the culture vessel.
- an immiscible liquid adsorbent it is also possible to retain a reservoir of the adsorbent separate from the culture. From the reservoir the adsorbent can be pumped into and out of the culture vessel, preferably with a cell impermeable but medium permeable barrier provided to separate the adsorbent within the culture vessel from the cells. The adsorbent may then be withdrawn on a continuous or intermittent basis from the adsorbent reservoir for extraction of the secondary metabolite, by routine means. For example extraction may be achieved using a suitable solvent (eg. alcohol) wash, possibly by adopting a counter-current packed bed arrangement.
- a suitable solvent eg. alcohol
- An advantage of an immiscible liquid adsorbent is that it will preferably float on the surface of the culture, and although it may be agitated through the culture to maximise efficiency of secondary metabolite removal, it can form as a discrete phase. This allows ready removal of the adsorbent from the culture.
- Another advantage is that immiscible liquids are readily amenable to sterilisation, such as for example by autoclaving. If secondary metabolite formation in a suspension culture takes place concurrently with growth, the metabolite is termed growth-associated, and a single medium formulation may be sufficient to achieve good growth and high level production.
- AMBERLITE® XAD-7 is a polymeric adsorbent resin that has been applied to plant cell culture systems where secondary metabolites are exported into the culture medium. In these circumstances it has generally demonstrated an enhanced effect (several fold to several ten-fold) on the production of secondary metabolites.
- XAD-7 in systems where there is little metabolite export from the cells.
- Experiments were performed where varying amounts of XAD-7 (5-50 g/L) were added to the culture medium. The results were surprising as increases in trans-resveratrol production of several thousand- fold were shown selectively in the medium. The increase in the level of trans-resveratrol in the medium is proportional to the level of XAD-7 added into the media (from 5-50g/L).
- Figure 6 shows an example of HPLC analysis from the experiment with 10 g/L XAD-7, where an extract from cells + XAD-7 (before sugar-density separation) contains both tr ⁇ «_.-piceid and tr ⁇ /zs-resveratrol peaks and an extract from XAD-7 alone shows a trans- resveratrol peak along with other minor peaks.
- Figure 7 shows an example of the kinetics of resveratrol production in the medium with the addition of 10 g/L XAD-7, based on HPLC analysis from XAD-7 extracts.
- the calculated resveratrol concentration reached 47mg/L. This represents approximately a 1000-fold increase compared with resveratrol concentrations found in culture medium in the control culture.
- AMBERLITE® XAD-7 is a nonionic polymeric adsorbent with surface area
- a Vitis vinifera cv. Gamay Freaux suspension cell line, FU-1 has been maintained by weekly subculturing in our laboratory since July 2000, according to the following method.
- This cell line capable of anthocyanin accumulation in the dark, was originally a gift from Dr. Francois Cormier's group (Cormier et al. (1994) Anthocyanin production in selected cell lines of grape (Vitis vinifera) In Vitro Cell Develop. - Plant, 30: 171-177).
- Suspension cultures were subcultured weekly in the dark in 250-ml Erlenmeyer flasks enclosed with aluminum foil containing 50 ml B5 medium (Gamborg et al.
- the subcultures were maintained on a reciprocating shaker (100 strokes/min) at 27 ⁇ 1 °C in a temperature-controlled incubator.
- Calli originating from the same material as FU-1 were subcultured fortnightly onto solid GC-2 medium - which is B5 (Gamborg et al. 1968) supplemented with 6 g agar/1, 30 g sucrose/1, 250 mg casein hydrolysate/1, 0.1 mg ⁇ - naphthaleneacetic acid/1 and 0.2 mg kinetin/1.
- the initial pH was adjusted to 5.7-5.8 using 0.1 M KOH before autoclaving. Cultures were incubated in the dark at 26 ⁇ 1°C.
- XAD-7 beads were added to the culture medium. The experiments were repeated 2-3 times.
- the medium was prepared by cleaning 15g XAD-7 for 30 minutes in 50mL MeOH and then washing 3x with MQ water on filter unit, then allowing to dry.
- the appropriate amount of beads was weighed and placed in 500mL flasks and then lOOmL GC-2 medium (broth) was added and autoclaved. Sampling and analysis on day zero was conducted by taking a representative sample (3ml) for each condition from each replicate flask and the samples were then pooled (total 3 samples), before conducting regular analysis (eg. fresh cell weight (FCW) and dry cell weight (DCW).
- FCW fresh cell weight
- DCW dry cell weight
- XAD-7 analysis was conducted by repeating the sampling as above (total 3 samples). Sample volumes were then recorded and samples were transferred into Eppendorf tubes. 3x 15mL falcon tubes each containing lOmL of 20%> sucrose solution were then prepared. The samples were filter dried and weighed before being transferred to 20% sucrose solution and being gently stirred at the top of the liquid to promote bead separation. Once separation was achieved the cell layer was removed and the beads were filter dried and washed thoroughly with water, before being transferred to Eppendorf tubes and weighed. 20x volume of MeOH was then added and allowed to extract for 1 hour, before collecting the supernatant and storing at -20°C. The sampling schedule adopted was to take 2x 3mL samples from each flask at day 4, day 7 and day 10, which were analysed as above.
- Example 2 Synergistic enhancement of extracellular trans-resveratrol production in V. vinifera cell suspension culture by combined use of elicitation and XAD-7 adsorbent.
- Jasmonic acid, chitosan, ⁇ -glucan and salicylic acid purchased from Sigma-Aldrich, were used as elicitors in the experiments described in this report.
- the jasmonic acid and salicylic acid solutions were prepared by dissolving them in ethanohwater (12:13) to give a 100 mM stock solution. This solution was diluted appropriately to give a desired concentration in the culture medium.
- the ⁇ -glucan and chitosan solutions were prepared by dissolving in 100%> ethanol and 1M acetic acid, respectively to give a 1 mg/mL stock solution. This stock solution was added directly to the culture medium to give the final concentrations adopted in the experiments. Both elicitor solutions were sterilized using a 0.22 ⁇ m filter.
- Elicitor screening Preliminary screening to select the effective elicitors and the optimal elicitor concentrations was done in 100 ml shake flasks. In each flask, 1.0 g wet cells were inoculated into 20 ml fresh medium and 20 ⁇ l of the appropriate dilution of the stock solution of each elicitor and their combinations was added at 4 days after inoculation to obtain final concentrations indicated in the results. For the control cultures, 20 ⁇ l blank ethanohwater (12:13) solution or 100% ethanol solution was added on day 4. Three flasks were used for each sample per treatment. Cultures from the whole flask were collected for analysis on day 4, 7 and 10 during the cultures.
- Elicitations For elicitation experiments, 7-day-old cells were filtered through a 50 ⁇ m stainless steel mesh and about 1 g wet cells of Vitis vinifera were inoculated into 20 ml of fresh liquid medium in 100 ml flasks. Elicitation was performed by adding 20 ⁇ l elicitor solution at various defined concentrations, and at day 4 during the culture cycle. Control culture flasks received 20 ⁇ l of sterile filtered ethanol: water (12:13) solution or 100% ethanol solution. The final concentration of ethanol in JA-treated and control cultures was less than 0.05%). The cultures were harvested at day 4, 7 and 10 to determine cell growth and stilbene content. Triplicate flasks were ran for each treatment and control. Independent controls were performed for each experiment due to the variability of the cell line in various subcultures. All the cultures were incubated at 27°C on a reciprocating shaker at 100 strokes/min under darkness.
- XAD-7 adsorbent For the treatments with XAD-7 adsorbent, a specific concentration of XAD-7 beads up to 200 g/L was added in culture medium at day 0 during the inoculation. The XAD-7 beads were pretreated according to the protocol reported in example 1.
- a specific concentration of XAD-7 beads was added at day 0 and a specific concentration of the elicitors was added at day 4 after inoculation.
- Figure 9 shows one example of results of the extracellular resveratrol production.
- Figure 11 shows an example of the effect of the combined treatments on cell growth. As shown in Figure 11, no obvious effect on cell growth was observed with the addition of XAD-7 beads from 20 g/L to 200 g/L. However the combination of XAD-7 and elicitors reduced the cell growth by 50%), which may reflect the growth inhibition effect of the elicitors used.
- Figure 12 shows the effect of combined treatments on the resveratrol content per gram of fresh cells + XAD-7 beads, where an extract from cells + XAD-7 was extracted and analyzed by HPLC. As shown in Figure 12, the elicitor treatments alone gave a several- fold increase in resveratrol content and the XAD-7 treatments surprisingly gave a few thousands-fold increase.
- XAD-7 and elicitors showed a synergistic effect, reaching a resveratrol content of more than 5000 ug/g-FCW (+XAD-7 beads) when 200 g/L XAD-7 was added on day 0 in the culture which was further elicited by 1 mg/L ⁇ - glucan and 10 ⁇ M jasmonic acid on day 4.
- Figure 13 indicated that the highest resveratrol production of 1932 mg/L could be obtained on day 10 of the culture when 200 g/L XAD-7 was added on day 0 in the culture which was further elicited by 1 mg/L ⁇ -glucan and 10 ⁇ M jasmonic acid on day 4. This value is approximately a 41000-fold increase compared to resveratrol concentrations found in culture medium in the control culture (47 ⁇ g/L).
- Resin beads e.g., XAD-7, HP2MG
- Resin beads were cleaned using MeOH, then washed with MilliQ water in vacuum filtration unit. 2 g of selected resin beads were placed in each lOOmL flask, then lOmL GC-2 medium was added. Each flask was covered with aluminum foil and autoclaved.
- the adsorbent resin beads used were from Mitsubishi Chemical Co: (Diaion series) HP2MG , HP20, HP 20SS, HP21 and (Sepabead series) SP207, SP70, SP700, SP825, SP850 and from Rohm & Haas Chemical Co: Amberlite series: XAD-4, XAD-7, XAD-16.
- the resin beads were added at 200 g/1 of culture in Experiment C.
- plant cell culture inoculum was prepared by taking wet cell material, from a 7-day old pre-culture grown in GC-2 medium and making the volume up with GC- 2 medium to give 1 g cell material per 10 ml GC-2 medium. Each flask was inoculated with 10ml of this suspension inoculum. Flasks were placed on a reciprocating shaker at 25 ⁇ l°C set at lOO rpm.
- Jasmonic acid (JA) treatment 20 ⁇ L of a stock solution of lOmM JA in 50% ethanol was added to each flask to give a final concentration of 10 ⁇ M Jasmonic Acid.
- ⁇ - glucan treatment 80 ⁇ L of a stock solution of 0.25 mg ⁇ -glucan /ml in 5.7% ethanol was added to each flask to give final concentration of 1 mg ⁇ -glucan /L.
- SA Salicylic acid
- 50 ⁇ L amounts of stock solutions of 200, 400 and 800 mM SA was added to each flask to give final concentrations of 500uM, ImM and 2mM of SA, respectively.
- Extracellular fermentation broth sample When cells were settled, 1-1.5 ml of the cell-free medium was transferred to an eppendorf tube and stored at -20°C (Labelled M). At a later time the samples were thawed and analyzed for total phenolics by processing as cell-free samples using the phenolics analysis method described below.
- Phenolics analysis was conducted using Folin-Ciocalteu technique of Singleton & Rossi (1965); modified Zhang (2002), Zhang & Kupke 2003.
- phenolics extraction the fresh cells + Resin beads in 15 ml Falcon tube were used and a 20-times volume of ethanol containing 0.P/o HC1 was added. The sample was homogenized for 1 minute, then placed horizontally on a shaker for 1 hour. 1-1.5 ml of extract was collected and centrifuged in Minifuge for 10 minutes at maximum rpm. The supernatant was transferred into a fresh Eppendorf vial, and stored at -20°C (Label P). Within 8 days the samples were analyzed for total phenolics using the phenolics analysis method described as follows:
- the sample was diluted with MQ water as appropriate to give a 1.2 ml sample.
- 50 ⁇ l Folin-Ciocalteu reagent was added, the tube vortexed and allowed to stand for 7 minutes at room temperature.
- 290 ⁇ l of 20%> Na 2 CO was added, the tube vortexed and allowed to stand for 1 hour at room temperature to allow reaction to complete.
- Absorbance was measured at 760nm (against empty cuvette). Total phenolics concentration was calculated from a gallic acid standard curve.
- the two conditions used in experiment A were as follows: Treatment ⁇ 200 g/L XAD-7 (added during medium preparation) + 1 mg/L ⁇ -glucan (added at Day 4 and again at Day 7) + 10 ⁇ M Jasmonic Acid (added at Day 4 and again at Day 7) Control • 200 g/L XAD-7 (added during medium preparation) ⁇ + 1 mg/L ⁇ -glucan (added at Day 4) + 10 ⁇ M Jasmonic Acid (added at Day 4) + same volumes elicitor solvents were added at Day 7 The number of replicates used for each condition was three.
- Total resveratrol yield at day 10 was almost 3.5 g/L for flasks elicited on both days 4 & 7, compared to almost 2.7 g/L for flasks elicited at only day 4.
- Extra-cellular phenolics (in medium) was 13mg/L in double elicited flasks, compared to 9.5mg/L in single elicited flasks.
- Phenolics in combined cells and XAD-7 was 3.76g/L in double elicited flasks, compared to 3.38g/L in single elicited flasks.
- Total phenolics (medium + cells + XAD-7) was 3.77g/L in double elicited flasks, compared to 3.39g/L in single elicited flasks.
- Resveratrol production results obtained from FU-04 cell culture when using one of a variety of different adsorbent materials are shown in Table 9 and Fig. 16.
- Phenolic compound production results obtained from FU-04 cell culture when using one of a variety of the following elicitor treatments carried out at day 4 are provided in Fig. 17:
- Resveratrol production results obtained from FU-04 cell culture when using one of the elicitor treatments described above are shown in Table 10 and Fig. 18.
- Phenolic compound production results obtained from FU-04 cell culture when using one of the elicitation conditions described in Table 11 are provided in Fig. 20. Resveratrol production
- Resveratrol production results obtained from FU-04 cell culture when using one of the elicitation conditions described in Table 11 are provided in Table 12 and Fig. 21.
- Solidified medium is prepared by adding 5g/ agar.
- Solidified medium is prepared by adding 8g/ agar.
- NAA 0.1 mg/ml 1 ml pH to 5.7-5.8 -
- Solidified medium is prepared by adding 8g/L agar.
- Kinetin (0.1 mg/ml) 2 ml
- Solidified medium is prepared by adding 8g/L agar.
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