Saeed Al Mossawi Uses Identification Further studies eg Pathogenicity antiviral sensitivity research Limitations Absence of detection system for the agent Inappropriate culture systems ID: 933107
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Slide1
CELL LINE CULTURE
By
Dr.Hesnaa
Saeed
Al-
Mossawi
Slide2Uses
Identification
Further studies
(e.g., Pathogenicity, antiviral sensitivity, research)
Limitations
Absence of detection system for the agent
Inappropriate culture systems
Viruses that cannot be
cultured
A negative viral culture results does not mean that
the agent
is absent
Slide3Specimens used to culture viruses
Blood specimens
EDTA
Heparin
Serum
Stool
Throat swabs
Naso-paryngeal aspirates
Stools, rectal swabs
Urine
Saliva
Cerebro
-spinal fluid
Biopsy
Skin (
filoviridae
)
Organs (fixation with formaldehyde 10%)
Slide4Virus isolation in
traditional
cell cultures (monolayer
cultures)1 . Primary culture2 . Semi - continuous
cell
culture3 . Continuous cell culture
Slide5Primary cultures
Viable
cell suspensions may be obtained by dissociating tissues or organs, e.g. human amnion, with trypsin, collagenase or other enzymes.
Slide6Semi continuous cell cultures (cell strains )
–
Semi continuous cell cultures are established with the successful subculture of primary cell monolayers. These cultures consist mostly of spindle shaped fibroblast cells. Established from human embryonic tissue, or neonatal foreskin. .
Slide7Continuous cell cultures ( cell lines
)
Continuous
cultures are produced either by transformation ( spontaneous or engineered ) of cell strains in vitro, or by culture of cells taken from tumors e.g
Hela ( human cervical carcinoma ) and a human rhabdomyosarcoma cell line (RD cells ).
Slide8Selection for culture media
A
range of media have been formulated for growth of vertebrate cells in culture. These incorporate various conc.
Of amino acids, vitamins, enzymes, growth factors, and inorganic salts. Glucose, fructose, or
galactose are also added along with glutamine to provide a carbon source for cell metabolism.
Slide9Type of cell
culture media:
–
Dulbecco,s Minimal Essential Medium (DMEM) is in common use for continuous cell lines.– CMRL medium is particularly suited for the propagation of semi -continuous cell lines.
– RPMI 1640 is recommended for growth of Lymphoblastoid cells in suspension
Slide10Conditions for growth of cell cultures
Optimum
pH.
A pH range of 7.1-7.5 is required
It is common to supplement the bicarbonate buffer system with HEPES buffer , it overrides all other buffers present and obviates the need for CO2-enriched atmosphere. for the growth of eukaryotic cells.Osmolarity . The growth of cells in culture depends on an optimum range of osmotic pressures, usually between 280 and 320 mmol/kgSerum. Balanced salt solutions will support cell proliferation only when supplemented with serum,
lactalbumin
hydrolysate, or other supplements. The serum has several functions : It provides essential amino acids, nucleic acid precursors, and fatty acids.Antibiotics. antibiotics providing broad spectrum protection from bacterial contaminants
Slide11Subculture of semi-continuous or continuous cell cultures
1
. Pour off culture medium and wash the cell sheet twice with
phosphat
buffered saline(PBS) 2. Add sufficient amount of trypsin-EDTA solution to cover cells. 3. Incubate at room temperature until cell sheet appears opaque. At this stage the cells will be rounded but not detached when observed with an inverted microscope. This process usually takes 1-3 min.4 .Remove excess trypsin solution.
Slide12Subculture of semi-continuous or continuous cell
cultures….CON
5. Add a small amount of chilled growth medium and aspirate several times with a 10 ml pipette to suspend and separate cells.
6. Dilute a small sample of the cell suspension with additional growth medium for cell counting or dispense directly into new growth vessels. Semi -continuous fibroblast are generally passed, one-to-two split. A one – to-six up to a one-to-ten split is common for continuous cultures.
7. When the monolayer reaches confluence, the growth medium should replaced with maintenance medium ( 2% serum).