Serum-Free Media in Cell Culture

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While many cell lines are still cultivated in media supplemented with ______, many cultures can now be grown in serum-free media.

serum

The need to standardize media between labs, provide specialized media for specific cell types, and eliminate variable natural products led to the development of more complex media, such as ______ by Morgan et al. in 1950.

M199

Each cell type appears to require a different ______, and cultures from malignant tumors may vary in requirements from tumor to tumor, even with one class of tumors.

recipe

Unfortunately, the transition to serum-free conditions, however desirable, is not always as straightforward as it seems. Some media may select a ______ that is not typical of the whole population, and even in continuous cell lines, some degree of selection may still be required.

<p>sublineage</p> Signup and view all the answers

The major constituents of serum like albumin and transferrin are known, but serum also contains a wide range of minor components that can have a significant effect on cell ______ and response to test substances.

<p>growth</p> Signup and view all the answers

Serum varies from batch to batch and, at best, a batch will last one year, possibly ______ during that time.

<p>deteriorating</p> Signup and view all the answers

The removal of serum also requires that the ______ of reagents and water and the degree of cleanliness of all apparatus be extremely high, as the removal of serum also removes the protective, detoxifying action that some serum proteins may have.

<p>purity</p> Signup and view all the answers

Changing serum batches necessitates extensive ______ to ensure that the replacement is as similar as possible to the previous batch.

<p>testing</p> Signup and view all the answers

Growth is often slower in serum-free media, and fewer generations are achieved with finite cell lines.

<p>proliferation</p> Signup and view all the answers

The essential factors in serum have been described and include: ______ such as fibronectin

<p>Adhesion</p> Signup and view all the answers

By removing serum and other animal products, the problems associated with using serum can be ______.

<p>eliminated</p> Signup and view all the answers

The essential factors in serum have been described and include: ______ such as insulin, PDGF, and TGF-β that regulate growth and differentiation

<p>Peptides</p> Signup and view all the answers

The ability to create a medium selective for a particular cell type is one of the major advantages of the control over ______-promoting activity afforded by serum-free media.

<p>growth</p> Signup and view all the answers

The essential factors in serum have been described and include: ______ such as minerals, vitamins, fatty acids, and intermediary metabolites

<p>Essential nutrients</p> Signup and view all the answers

Serum-free media are not without ______.

<p>disadvantages</p> Signup and view all the answers

The essential factors in serum have been described and include: ______ such as insulin, hydrocortisone, estrogen, and triiodothyronine.

<p>Hormones</p> Signup and view all the answers

The addition of serum to the medium can increase the ______ , which is important in stirred suspension cultures.

<p>viscosity</p> Signup and view all the answers

The use of serum in cell culture media can introduce undefined ______ , which can impact the reliability of experimental results.

<p>constituents</p> Signup and view all the answers

After subculture, the addition of serum inhibits any residual ______ activity.

<p>proteolytic</p> Signup and view all the answers

To replace serum in cell culture media, ______ such as growth hormone, insulin, and hydrocortisone can be used.

<p>hormones</p> Signup and view all the answers

The use of serum in cell culture media is often associated with the risk of ______ infectious agents

<p>adventitious</p> Signup and view all the answers

In serum-free media, ______ such as soya bean trypsin inhibitor or aprotinin are added after subculture.

<p>protease inhibitors</p> Signup and view all the answers

Regulatory authorities are increasingly pushing for the removal of all ______ products from contact with cultured cells used in the production of biopharmaceuticals.

<p>animal</p> Signup and view all the answers

______ such as EGF, PDGF, and IGF-I, have been found to be mitogenic in vitro.

<p>Growth factors</p> Signup and view all the answers

______ is a trophic factor; chemotactic factor; differentiation factor; neurite outgrowth in peripheral nerve.

<p>Nerve gf, B</p> Signup and view all the answers

______ is a mixture of endothelial mitogens.

<p>Endothelial growth supplement</p> Signup and view all the answers

A member of the IL-6 group, ______ is a differentiation inducer (with glucocorticoid); fibroblast mitogen.

<p>Oncostatin M</p> Signup and view all the answers

______ is a mitogen for astroglia.

<p>Astroglial growth factor-1</p> Signup and view all the answers

______ is a mitogen for many mesodermal and neuroectodermal cells; adipocyte and ovarian granulosa cell differentiation.

<p>Basic fibroblast gf</p> Signup and view all the answers

A member of the acidic FGFs, ______ is a mitogen for astroglia.

<p>Astroglial growth factor-2</p> Signup and view all the answers

______ is a mitogen for endothelial cells.

<p>Acidic fibroblast gf</p> Signup and view all the answers

______ is an angiogenic; endothelial mitogen.

<p>Angiogenin</p> Signup and view all the answers

______ is an immune suppressor

<p>Interleukin-10</p> Signup and view all the answers

______ is a mitogen for some normal epithelia.

<p>Cholera toxin</p> Signup and view all the answers

______ is a fibroblast mitogen; angiogenic; matrix production.

<p>Connective tissue growth factor</p> Signup and view all the answers

A member of the basic FGFs, ______ is a mitogen for many mesodermal and neuroectodermal cells; adipocyte and ovarian granulosa cell differentiation.

<p>Basic fibroblast gf</p> Signup and view all the answers

______ is an active transport; DNA, RNA, protein, synthesis; mitogen for epithelial and fibroblastic cells; synergizes with IGF-1 and TGF-β.

<p>Epidermal growth factor</p> Signup and view all the answers

The ______ cell line, known for its use in research, is commonly cultivated in Eagle's MEM, M199, MB752/1, CMRL 1066, MCDB media, DMEM:F12 + supplements.

<p>continuous</p> Signup and view all the answers

A549 cells, used in research for studying ______ cancer, are often cultivated in PeproGrow-1 medium.

<p>lung</p> Signup and view all the answers

The ______ cell line, derived from human cervical cancer, is often grown in either aMEM or Iscove's medium.

<p>HeLa</p> Signup and view all the answers

______ are a type of cell commonly used in research and are often cultivated in MCDB 153 medium.

<p>Keratinocytes</p> Signup and view all the answers

The ______ cell line, derived from a human embryonic kidney cell line, is typically grown in HEKTOR, HЕК, or CDM4HEK293 medium.

<p>HEK293</p> Signup and view all the answers

Mouse ______ cells, commonly used in cell culture research, are often grown in MCDB 402 medium.

<p>embryo fibroblasts</p> Signup and view all the answers

The ______ cell line, derived from a Madin-Darby canine kidney, is often cultivated in MCDB 170 medium.

<p>MDCK</p> Signup and view all the answers

The ______ cell line, derived from the African green monkey, is commonly grown in a variety of media, including MCDB 153, KSFMC, KGM-2, PFEK-1, PF-Vero, MP-Vero, and Ex-cell Vero.

<p>Vero</p> Signup and view all the answers

The ______ cell line, derived from human colorectal adenocarcinoma, is often grown in various media including those specifically designed for tumor cell culture.

<p>HT-29</p> Signup and view all the answers

The ______ cell line, derived from a human promyelocytic leukemia, is often cultivated in specialized media designed for leukemia cell culture.

<p>HL-60</p> Signup and view all the answers

Mouse ______ cells, often used for research purposes, are frequently cultivated in SF12, a modified Ham's F12 medium containing extra essential and nonessential amino acids.

<p>glial</p> Signup and view all the answers

______ cells, a type of cell commonly used in research, are often grown in MCDB 110, 202, or 402 medium.

<p>Endothelial</p> Signup and view all the answers

The ______ cell line a commonly used model for studying hepatitis B virus infection, is often grown in specialized medium containing a cocktail of growth factors and nutrients.

<p>HepG2</p> Signup and view all the answers

______ cells, often used in research to study muscle development, are often cultivated in MCDB 130, 131 medium.

<p>COS-1,7</p> Signup and view all the answers

The ______ cells, often used in the study of cartilage regeneration, are often cultivated in supplemented DMEM/F12 medium.

<p>chondrocytes</p> Signup and view all the answers

Flashcards

Serum-Free Media

Media used for cell culture without any serum additives.

Historical Media Examples

Notable serum-supplemented media developed over time, like M199 and Ham's F10.

Disadvantages of Serum

Problems include physiological variability, shelf life issues, and quality control challenges.

Physiological Variability

Variability in serum components affects cell growth and responses.

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Shelf Life and Consistency

Serum batches differ and degrade over time, impacting experiments.

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Quality Control

Testing necessary when switching serum batches to ensure consistency.

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Advantages of Serum-Free Media

Standardization and selective growth media tailored for specific cells.

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Multiplicty of Media

The large variety of serum-free formulations that exist for different cell types.

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Selectivity in culture

Selectivity refers to the tendency of media to favor certain cell sublineages over others.

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Reagent purity

High purity of reagents and water is essential when serum is removed to maintain cell health.

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Cell proliferation

Cells grow slower in serum-free media which can limit the number of generations for finite lines.

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Adhesion factors

Substances like fibronectin that allow cells to attach to surfaces for growth.

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Serum-free media requirements

Serum-free media must compensate for factors like growth hormones, nutrients, and adhesion proteins.

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Commercially available serum-free media

Various suppliers provide defined and proprietary serum-free media for different cell types.

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Subculture protocol modification

Adjustments may be needed in procedures when subculturing cells without serum, focusing on adhesive properties.

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Peptides in serum

Peptides like insulin and PDGF regulate cell growth and differentiation in serum.

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Bovine Serum Albumin (BSA)

A protein used to enhance cell growth and survival in culture media.

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Protease Inhibitors

Substances added to prevent proteolytic activity after subculturing.

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Trypsin

An enzyme used for cell detachment during subculture.

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Growth Factors

Polypeptides that stimulate cell growth and division in culture.

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Viscosity in Media

The thickness of culture media impacted by serum addition.

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Recombinant Trypsin

Genetically engineered trypsin for cell culture applications without animal products.

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Growth Hormones

Hormones like insulin and hydrocortisone used instead of serum.

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Acidic Fibroblast Growth Factor (aFGF)

Mitogen for endothelial cells, from bovine brain and pituitary.

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Activin

Morphogen that stimulates FSH secretion, from the gonads.

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Amphiregulin

Autocrine EGF-like growth factor for keratinocytes.

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Angiogenin

Angiogenic factor and endothelial mitogen from lymphocytes and epithelial cells.

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Brain-derived Neurotrophic Factor (BDNF)

Promotes neuronal viability, produced in the brain.

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Cholera Toxin

Mitogen for some epithelial cells, derived from cholera bacillus.

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Erythropoietin (EPO)

Stimulates erythroid progenitor proliferation and differentiation in the kidney.

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Fibroblast Growth Factor (bFGF)

Mitogen for various mesodermal and neuroectodermal cells, stimulating cell differentiation.

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Insulin-like Growth Factor 1 (IGF-1)

Mediates growth hormone effects, promoting cartilage sulfation.

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Interferon-gamma (IFN-γ)

Antiviral, activates macrophages, produced by activated lymphocytes.

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Keratinocyte Growth Factor (KGF)

Promotes keratinocyte proliferation and differentiation.

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Platelet-derived Growth Factor (PDGF)

Mitogen for mesodermal and neuroectodermal cells, aids wound repair.

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Transforming Growth Factor-beta (TGF-β)

Inhibitor of epithelial cell proliferation, important for squamous differentiation.

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Vascular Endothelial Growth Factor (VEGF)

Promotes angiogenesis and vascular endothelial cell proliferation.

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Granulocyte Colony-Stimulating Factor (G-CSF)

Stimulates granulocyte production; important in immune regulation.

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A549

A cell line derived from human lung carcinoma used in cancer research.

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CHO Cells

Chinese Hamster Ovary cells, commonly used in protein production.

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HeLa Cells

Immortal cell line derived from cervical cancer cells, critical for research.

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Fibroblasts

Cells that synthesize extracellular matrix and collagen, crucial for tissue growth.

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Endothelial Cells

Cells lining blood vessels, vital for vascular health.

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Adipocytes

Fat cells that store energy and regulate metabolism.

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Melanocytes

Cells responsible for the production of melanin in the skin.

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Neurons

Nerve cells that transmit signals in the nervous system.

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Stem Cells

Undifferentiated cells capable of giving rise to various cell types.

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Corneal Epithelial Cells

Cells that form the outer layer of the cornea in the eye.

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Chondrocytes

Cells found in cartilage that produce and maintain the cartilage matrix.

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Lymphoblastoid Cell Lines

Cells derived from lymphocytes used for studying immune responses.

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Hybridomas

Cells produced by fusing a specific antibody-producing cell with a myeloma cell.

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Osteoblasts

Bone cells responsible for bone formation.

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Vero Cells

Cell line derived from the kidney of an African green monkey used in virology.

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Study Notes

Serum-Free Media

  • Many cell lines are still grown in media supplemented with serum.
  • Serum-free media are increasingly used for standardized media, specialized media for specific cell types, and to remove natural products.
  • Historical media developments include M199, CMRL 1066, NCTC109, Waymouth's MB 572/1, NCTC135, and Birch and Pirt media, all tailored to specific cell types such as fibroblasts and CHO cells.
  • Ham's F-10 and F-12 media were developed for CHO cells.
  • Serum-free media were developed for HeLa cells, as well as other human and murine cells, including primary cultures.
  • Media like the MCDB series, Sato's DMEM/F12-based media and RPMI 1640-based media demonstrated that serum could be reduced or eliminated with appropriate modifications.
  • Removal of animal proteins is desired for biopharmaceuticals and to address safety concerns, leading more serum-free media formulations.

Disadvantages of Serum

  • Serum's major components, like albumin and transferrin, are known but other components (nutrients, proteins, peptide growth factors hormones, minerals, lipids) remain undefined.
  • Serum varies from batch to batch and only lasts about a year resulting in inconsistencies.
  • Quality control is increased for batch changes due to variability.
  • Removing serum introduces issues like viral contamination and also the cost of serum can be significant compared to other medium components.

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