Cell And Tissue Culture. Why is it useful? Gene manipulation Culturing mammalian cells for cancer studies Producing new plants through tissue culture.

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Presentation transcript:

Cell And Tissue Culture

Why is it useful? Gene manipulation Culturing mammalian cells for cancer studies Producing new plants through tissue culture

What do you need to do it? Source of cell material -freshly prepared -stock of cell line -bacterial culture

Suitable container Simple flask Sophisticated fermenter with computer- controlled monitoring

Growth medium Glucose Water Amino acids Salts

Opportunity for Gas Exchange Oxygen Carbon dioxide

Animal serum Foetal Bovine Serum Essential for animal cell proliferation 5% - 10% of growth media

Indicator Waste products causes change in pH Use indicator like phenol red Changes from red to yellow

Control of Temperature and pH 37.5 O C pH 7.5

Method for Measuring Cell Growth Counting cell numbers in culture (haemocytometer) Measure optical density in spectrophotometer

Sterilisation Antibiotics Sterilisation

Cells are either…. Anchorage – dependant Anchorage - independant

Anchorage – independant cells Cells associated with body fluid -blood cells Grown in suspension Will eventually need subculturing

Anchorage – dependant cells Most animal derived cells Adhere to bottom of a flask and form a monolayer Eventually cover entire surface of substratum (confluence) Proliferation then stops Need to subculture cells at this point (remove to fresh medium) Proliferation can begin again

2 main categories of animal cell cultures…. Primary culture Continuous cell line

Primary Cultures Taken from fresh tissue Limited life span in culture Treated by proteolytic enzyme (Trypsin) Separate into single cells -epithelial cells -fibroblasts

Continuous Cell Line Derived from humans Been transformed -lose sensitivity to factors associated with growth control Produce immortalised cell lines Cell lines are neoplastic Often lose their anchorage-dependence -associated with an altered xsome pattern More easily cultured

Cell line Species of origin Tissue of origin Cell morphology Growth in suspension? 3T3MouseConnectiveFibroblastNo CHOChinese Hamster OvaryEpithelialYes BHK21Syrian Hamster KidneyFibroblastYes HeLaHumanCervical Carcinoma EpithelialYes

Why do it? Particular cells can be isolated and cloned -isolation of mutant cells -investigate cell growth -produce hybrid cells that have applications in biotechnology Produce important pharmaceuticals -vaccines -hormones