DE10039856A1 - Inducing cell replication in resting cells, useful for producing cells for e.g. toxicology testing, by transient expression of immortalizing gene - Google Patents
Inducing cell replication in resting cells, useful for producing cells for e.g. toxicology testing, by transient expression of immortalizing geneInfo
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- DE10039856A1 DE10039856A1 DE10039856A DE10039856A DE10039856A1 DE 10039856 A1 DE10039856 A1 DE 10039856A1 DE 10039856 A DE10039856 A DE 10039856A DE 10039856 A DE10039856 A DE 10039856A DE 10039856 A1 DE10039856 A1 DE 10039856A1
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- 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
- C12N5/06—Animal cells or tissues; Human cells or tissues
- C12N5/0602—Vertebrate cells
- C12N5/067—Hepatocytes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
- A61K35/12—Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
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- 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
- C12N2503/00—Use of cells in diagnostics
- C12N2503/02—Drug screening
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- 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
- C12N2510/00—Genetically modified cells
- C12N2510/02—Cells for production
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- 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
- C12N2510/00—Genetically modified cells
- C12N2510/04—Immortalised cells
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- 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
- C12N2799/00—Uses of viruses
- C12N2799/02—Uses of viruses as vector
- C12N2799/021—Uses of viruses as vector for the expression of a heterologous nucleic acid
- C12N2799/022—Uses of viruses as vector for the expression of a heterologous nucleic acid where the vector is derived from an adenovirus
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Genetics & Genomics (AREA)
- Zoology (AREA)
- Organic Chemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Biotechnology (AREA)
- Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Gastroenterology & Hepatology (AREA)
- Microbiology (AREA)
- Biochemistry (AREA)
- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Cell Biology (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und Mittel zur Induktion von Zell-Vermehrung in denjenigen Zelltypen menschlicher und tierischer Art, die sich normalerweise nicht mehr teilen oder die eine sehr stark begrenzte Vermehrungskapazität in-vitro zeigen. Insbesondere soll eine Zell-Vermehrung erreicht werden, ohne daß generelle Veränderungen in der Zusammensetzung des zellulären Genoms und somit reversible Eigenschaften in den Zellen eintreten. Bevorzugt betrifft die Erfindung neuartige Hepatozyten mit verlängerter Lebensspanne.The invention relates to a method and means for induction of cell proliferation in those cell types human and animal species that normally no longer share or which has a very limited propagation capacity in vitro demonstrate. In particular, cell proliferation is said to be achieved without any general changes in the Composition of the cellular genome and therefore reversible Properties occur in the cells. Preferably relates to the Invention of novel hepatocytes with an extended lifespan.
Es besteht ein Bedarf im medizinischen und biotechnologischen Anwendungsbereich, sich vermehrende Zellpopulationen zu besitzen, die über einen hoch differenzierten Phänotyp verfügen. Viele tierische und humane Zellen haben im natürlichen Zellverband eines Organismus eine Proliferations- Kapazität, die auf 50 bis 100 Zellteilungen begrenzt ist, bevor die Zellen absterben. Jedoch ist die Nutzung dieses Potentials in Zellkulturen schwierig zu erreichen, da dafür eine optimale zelluläre Mikro-Umgebung einschließlich eines Komplexes mitogener und co-mitogenger Faktoren notwendig ist. Deshalb sind bei einzelnen Zelltypen nur wenige Zellteilungen oder überhaupt keine zu beobachten, wie zum Beispiel bei Kardiomyozeten, hepatischen Zellen, Neuronen, pankreatischen Zellen.There is a need in medical and biotechnological Scope of application, multiplying cell populations possess that have a highly differentiated phenotype feature. Many animal and human cells have natural cell association of an organism a proliferation Capacity limited to 50 to 100 cell divisions, before the cells die. However, the use of this Potentials in cell cultures difficult to achieve because of that an optimal cellular micro-environment including one Complex mitogenic and co-mitogenic factors are necessary. Therefore, there are only a few cell divisions for individual cell types or not to be observed at all, such as in Cardiomyocetes, hepatic cells, neurons, pancreatic Cells.
Zum Auffinden neuer Wirkstoffe ist es für die biotechnologische Industrie eine wichtige Voraussetzung, diese Barriere zu überwinden, Bedingungen für das Wachstum von Zellen der verschiedensten Körperorgane in-vitro zu etablieren und die Proliferations-Kapazität der Zellen zu nutzen. In bestimmten Fällen können immortalisierte Zellinien direkt aus Tumormaterial etabliert oder durch verschiedene Behandlungen von Primärzellen aus normalem Gewebe isoliert werden. Im letzteren Fall wurde ein immortalisierenden Gen in das Genom der Zielzelle eingebracht, speziell ein Gens von DNA-Tumorviren (wie zum Beispiel "Large T-Antigen aus Simian Virus-40"). Allerdings führte die dauernde Expression des immortalisierenden Genes zu unerwünschten, auch transformierten und tumorigen Eigenschaften der Zellen, die zudem eine Erniedrigung der zelltypischen Eigenschaften bis hin zum Abschalten oder sogar Verlust der spezifischen zellulären Aufgaben führen kann.To find new active ingredients, it is for the biotechnology industry an important requirement to overcome this barrier, conditions for growth of cells from a wide variety of body organs in vitro establish and the proliferation capacity of the cells too use. In certain cases, immortalized cell lines established directly from tumor material or through various Treatments of primary cells isolated from normal tissue become. In the latter case, an immortalizing gene was found in introduced the genome of the target cell, specifically a gene from DNA tumor viruses (such as "Large T antigen from Simian Virus-40 "). However, the continuous expression of the immortalizing genes to unwanted ones, too transformed and tumorigenic properties of the cells that a decrease in cell-typical properties up to towards switching off or even losing the specific can perform cellular tasks.
Die Aufgabe der Erfindung bestand deshalb darin, ein Verfahren zur Induktion einer nicht-immortalisierenden und nicht-malignen Proliferation von ruhenden Zellen aus einem Organismus hin zu einer homogenen Zellpopulation zu erreichen.The object of the invention was therefore to Process for inducing a non-immortalizing and non-malignant proliferation of resting cells from one Organism towards a homogeneous cell population to reach.
Erfindungsgemäß wird eine zeitlich begrenzte Expression eines exogenen, immortalisierenden Gens genutzt, um die Zellmitose anzuregen.According to the invention, a time-limited expression of a exogenous, immortalizing gene used to treat cell mitosis to stimulate.
Die Erfindung wird gemäß den Ansprüchen realisiert. In einer bevorzugten Ausführungsvariante betrifft die Erfindung neuartige Hepatozyten mit verlängerter Lebensspanne, die insbesondere zur extrakorporalen Übernahme von Leberfunktionen, zur pharmakologischen und toxikologischen Untersuchung von Arzneistoffen in-vitro, zur Produktion rekombinanter Proteine und zur Produktion glykosylierter Proteine geeignet sind.The invention is implemented according to the claims. In a preferred embodiment variant relates to the invention novel hepatocytes with an extended lifespan, the especially for the extracorporeal takeover of Liver functions, for pharmacological and toxicological Investigation of drugs in vitro, for production recombinant proteins and for the production of glycosylated Proteins are suitable.
Die hier vorgelegte Erfindung beruht dabei auf der überraschenden Erkenntnis, daß die Beseitigung eines immortalisierenden Genes nach Beginn der Zellteilung, eine Zellpopulation erzeugt, die eine definierte Proliferations- Kapazität in Gegenwart von Wachstumsfaktoren zeigt. The invention presented here is based on the surprising finding that the removal of a immortalizing gene after the beginning of cell division, a Cell population that defines a defined proliferation Shows capacity in the presence of growth factors.
Gegenstand der vorgelegten Erfindung ist deshalb die Einbringung eines immortalisierenden Gens, wie z. B. das Large T-Antigen, in eine Population von Zielzellen einer Primärkultur.The subject of the invention is therefore the Introduction of an immortalizing gene, such as B. the Large T antigen, in a population of target cells Primary culture.
Das Genkonstrukt, das das immortalisierende Gen enthält, ist ebenfalls ein weiteres genetisches Unter-Konstrukt, das ebenfalls die spezielle Eigenschaft besitzt, daß zu einem späteren frei wählbaren Zeitpunkt die Expression des Gens in der Zielzelle abgeschaltet werden kann.The gene construct that contains the immortalizing gene is also another genetic sub-construct, the also has the special property that a expression of the gene at a later time of your choice the target cell can be switched off.
Beispiele für solche erfindungsgemäßen Konstrukte stellen Plasmide dar, die keine Erkennungssequenz für den Beginn der Replikation zur Plasmid-bedingten Replikation in der Zielzelle enthalten (Fig. 1a) oder es wird ein Replikations-defizienter Retrovirus genutzt, in dem das immortalisierende Gen neben anderen Fremdsequenzen von loxP Sequenzen umrahmt ist. Diese loxP Sequenzen erlauben ein Ausscheiden der umrahmten Gensequenzen mithilfe des Enzymes cre-Rekombinase (Fig. 1b). In einer bevorzugten Ausführungsvariante wird die Cre-Rekombinase in die Zielzelle mittels eines nicht-integrierenden, Replikations-defizienten Adenovirus eingebracht (Fig. 1b).Examples of such constructs according to the invention are plasmids which do not contain a recognition sequence for the start of replication for plasmid-related replication in the target cell ( FIG. 1a) or a replication-deficient retrovirus is used in which the immortalizing gene, among other foreign sequences from loxP sequences is framed. These loxP sequences allow the framed gene sequences to be eliminated using the enzyme cre recombinase ( FIG. 1b). In a preferred embodiment variant, the Cre recombinase is introduced into the target cell by means of a non-integrating, replication-deficient adenovirus ( FIG. 1b).
Bevorzugt werden die erfindungsgemäß hergestellten Zellen mit verlängerter Lebensspanne zur pharmakologischen und toxikologischen Untersuchung von Arzneistoffen in-vitro, zur Produktion rekombinanter Proteine und zur Produktion glykosylierter Proteine eingesetzt.The cells produced according to the invention are preferred with extended lifespan for pharmacological and toxicological investigation of drugs in vitro, for Production of recombinant proteins and for production glycosylated proteins used.
Anschließend wird die Erfindung anhand von Ausführungsbeispielen näher erläutert, auf die sie jedoch nicht beschränkt werden soll.The invention is then based on Embodiments explained in more detail, but they should not be limited.
Plasmid pCMV-Tagori (Fig. 1a) wird in ruhende primäre Maus Hepatozyten transduziert. Nach sechs Wochen wurden proliferierende Kolonien gespickt, von denen etwa ein Drittel kein Large T-Antigen exprimierte. Diese Zellen konnten weiterhin für 15-20 Passagen bei einer Aufteilungsrate von 1 : 3 bis 1 : 5 subkultiviert werden. Nach weiteren Passagen nahm die Zellteilung ab, bis dann die Zellteilung völlig erlosch.Plasmid pCMV-Tagori ( Fig. 1a) is transduced into resting primary mouse hepatocytes. After six weeks, proliferating colonies were spiked, about a third of which did not express Large T antigen. These cells could continue to be subcultured for 15-20 passages at a division rate of 1: 3 to 1: 5. After further passages, the cell division decreased until the cell division completely ceased.
Ruhende primäre Maus Hepatozyten wurden mit loxP-HyTK-large-T Retrovirus (Fig. 1b) infiziert, der in das Zell-Genom integriert. Immortalisierte Hepatozyten Klone wurden isoliert und als Large T-Antigen exprimierende Zellinien etabliert. Derartige proliferierende Zellinien wurden mit einem speziellen Adenovirus-Konstrukt infiziert, das cre- Rekombinase exprimiert. Das Enzym cre-Rekombinase schneidet die von loxP Sequenzen umrahmten Sequenzen aus, in diesem Fall Large T-Antigen zusammen mit CMV Promoter und HyTK. Die resultierenden Zellen wurden mit Ganciclovir behandelt, das intrazellulär durch HyTK zu einem Zell-Toxin aktiviert wird. Dadurch werden diejenigen Zellen getötet, in denen durch die cre-Recombinase des Genkonstrukt nicht korrekt herausgeschnitten worden war. Überlebende Zellen exprimierten kein Large T-Antigen mehr, womit bestätigt war, daß die loxP umrahmten Sequenzen erfolgreich herausgeschnitten waren. Large T-Antigen negative Zellen waren in der Lage in Kulturmedium zu proliferieren, das Wachstumsfaktoren enthielt. Die Proliferationsraten nahm nach etwa 20 Passagen ab und erlosch dann völlig.Resting primary mouse hepatocytes were infected with loxP-HyTK-large-T retrovirus ( Fig. 1b), which integrated into the cell genome. Immortalized hepatocyte clones were isolated and established as cell lines expressing Large T antigen. Such proliferating cell lines were infected with a special adenovirus construct that expresses cre recombinase. The enzyme cre recombinase cuts out the sequences framed by loxP sequences, in this case Large T antigen together with the CMV promoter and HyTK. The resulting cells were treated with ganciclovir, which is activated intracellularly by HyTK to form a cell toxin. As a result, those cells are killed in which the cre recombinase of the gene construct had not been excised correctly. Surviving cells no longer expressed Large T antigen, confirming that the loxP framed sequences were successfully excised. Large T antigen negative cells were able to proliferate in culture medium containing growth factors. The proliferation rate decreased after about 20 passages and then went out completely.
Die hier beschriebenen Zellinien mit endlicher Lebensdauer bleiben genetisch identisch mit den Primärzellen aus denen sie abgeleitet worden waren, haben allerdings eine weit verlängerte Proliferationsspanne gegenüber Primärzellen von ungefähr 50-100 Zellteilungen.The cell lines with finite lifespan described here remain genetically identical to the primary cells from which they were derived, however, have a wide range prolonged proliferation span compared to primary cells of about 50-100 cell divisions.
Diese Zellinien mit verlängerter Lebensdauer erlauben die Untersuchung grundlegender biologischer Prozesse beispielsweise in Hepatozyten und somit die Entwicklung therapeutisch aktiver Wirkstoffe, die in-vitro Abklärung toxischer Eigenschaften von therapeutischen Wirkstoffen und die Etablierung von Zellen für die Herstellung rekombinanter Proteine.These cell lines with extended lifespan allow the Investigation of basic biological processes for example in hepatocytes and thus development therapeutically active substances, the in-vitro clarification toxic properties of therapeutic agents and the establishment of cells for the production of recombinant Proteins.
Claims (24)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE10039856A DE10039856A1 (en) | 1999-08-10 | 2000-08-10 | Inducing cell replication in resting cells, useful for producing cells for e.g. toxicology testing, by transient expression of immortalizing gene |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE19936793 | 1999-08-10 | ||
DE19957951 | 1999-10-20 | ||
DE10039856A DE10039856A1 (en) | 1999-08-10 | 2000-08-10 | Inducing cell replication in resting cells, useful for producing cells for e.g. toxicology testing, by transient expression of immortalizing gene |
Publications (1)
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DE10039856A1 true DE10039856A1 (en) | 2001-05-03 |
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DE10039856A Withdrawn DE10039856A1 (en) | 1999-08-10 | 2000-08-10 | Inducing cell replication in resting cells, useful for producing cells for e.g. toxicology testing, by transient expression of immortalizing gene |
Country Status (3)
Country | Link |
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AU (1) | AU7769700A (en) |
DE (1) | DE10039856A1 (en) |
WO (1) | WO2001011030A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1427850A4 (en) * | 2001-08-16 | 2006-02-08 | Phase 1 Molecular Toxicology I | Human toxicologically relevant genes and arrays |
DE102007041655A1 (en) * | 2007-09-03 | 2009-03-05 | Medicyte Gmbh | Propagation of primary cells and their use |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US6110743A (en) * | 1995-02-10 | 2000-08-29 | The Regents Of The University Of California | Development and use of human pancreatic cell lines |
DE19626830A1 (en) * | 1996-07-04 | 1998-01-08 | Max Delbrueck Centrum | Conditional immortalization method for human tumor cells for the production of a vaccine |
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2000
- 2000-08-10 DE DE10039856A patent/DE10039856A1/en not_active Withdrawn
- 2000-08-10 WO PCT/DE2000/002725 patent/WO2001011030A2/en active Application Filing
- 2000-08-10 AU AU77697/00A patent/AU7769700A/en not_active Abandoned
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WO2001011030A2 (en) | 2001-02-15 |
AU7769700A (en) | 2001-03-05 |
WO2001011030A3 (en) | 2001-05-31 |
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Owner name: DEVELOGEN AG FUER ENTWICKLUNGSBIOLOGISCHE FORSCHUN |
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