Historical Development and Principle of Cell Culture

What is Cell Culture?

Historical Development

1. Pre-Foundation Era (1850s-1880s)

• Claude Bernard (1850s) - The French physiologist demonstrated that animal cells cannot survive in plain water and require a nutritive environment, establishing the conceptual necessity of a suitable culture medium.
• Leo Loeb - Pioneered an early technique he called "tissue culture within the body," demonstrating that cells could be cultured both inside and outside body tissues.

2. The Birth of Tissue Culture (1885-1910)

• Wilhelm Roux (1885) - The German zoologist is credited with performing the first true tissue culture experiment. He maintained a section of the medullary plate of an embryonic chicken in a warm saline buffer for 13 days outside the body, proving that living cells could survive ex vivo.
• Ross Granville Harrison (1906) - The American embryologist at Johns Hopkins University is considered the true father of cell culture. He developed the first genuine in vitro cell culture technique by:
  • Growing frog embryonic nerve fiber tissue in a liquid medium of blood clots, saline, and agar inside test tubes
  • Inventing the "hanging drop" technique - cells were cultured within plasma on the underside of glass slides, forming droplets where cells gathered and grew
  • Introducing aseptic (sterile) techniques essential to cell work
  • Making cell life "visible" and directly observable

3. Expansion and Standardization (1910s-1940s)

• Alexis Carrel and Montrose Burrows (1910s) - Adapted Harrison's hanging drop technique using chicken plasma clots, which were more homogenous and reliable. They cultured embryonic and adult tissues (including cancerous tissues) of many species that could be maintained in vitro for several months. Carrel famously (though controversially) claimed to maintain chicken heart cells in continuous culture for over 30 years, suggesting cells could be "immortalized."
• Carrel introduced the concept of regular subculturing (passaging) cells to fresh media - a principle still central to cell culture today.

4. The Virology Revolution (1949)

• John Franklin Enders (1949) - Described a technique for cultivating mammalian cells for the isolation of poliovirus, earning the Nobel Prize. This breakthrough was monumental: it showed that strict intracellular organisms (viruses) could be studied in cultured cells, expanding cell culture from embryology into virology and infectious disease. As noted in Medical Microbiology 9e, "This technique has been expanded for the growth of most strict intracellular organisms."

5. The HeLa Cell Line and Immortalization (1951)

• HeLa cells (1951) - Cervical cancer cells from Henrietta Lacks became one of the first established immortal human cell lines. These cells grow indefinitely in culture and remain one of the most widely used research tools in the world, used to study cancer biology, cellular structure, and function globally (Junqueira's Basic Histology, 17e).

6. Media Standardization and the 2D Era (1950s-1970s)

• Joseph Leighton (1950s) - Raised concerns about the limitations of 2D flat-surface cultures, noting they did not reflect the true three-dimensional spatial architecture of cells in vivo. He pioneered experiments using 3D cellulose sponge matrices saturated with bird-embryo plasma.
• Johannes Holtfreter - Described methods to form spherical 3D cell aggregates (spheroids), preventing cells from adhering to flat surfaces and promoting three-dimensional development. He introduced agitation apparatuses to facilitate cell-cell contact in suspension.
• Eagle's Minimal Essential Medium (MEM, 1955) - Harry Eagle defined the minimal nutrient requirements for cells, creating the first standardized, chemically defined culture media - a landmark in reproducibility.
• Graham and Van der Eb (1973) - Introduced DNA into mammalian cells in culture using calcium phosphate precipitation, forming the basis for gene transfection techniques.

7. Stem Cells and 3D Culture (1960s-2000s)

• Alexander Friedenstein (1960s-70s) - From bone marrow cell cultures, the Russian physician identified a subpopulation of non-hematopoietic, adherent, fibroblastoid cells that could form discrete colonies from a single progenitor - the colony-forming unit fibroblastic (CFU-F). This established the concept of mesenchymal stromal/stem cells (MSCs).
• 1992 - The American Type Culture Collection (ATCC) established a standardized cell bank, making authenticated cell lines globally accessible.

8. iPSCs and the Modern Era (2006-present)

• Takahashi and Yamanaka (2006) - Achieved the reprogramming of adult somatic cells (fibroblasts) into induced pluripotent stem cells (iPSCs), enabling the generation of virtually any cell type from adult tissues. This was a paradigm-defining breakthrough.
• Organoids and Organ-on-a-Chip - Recent advances include growing miniature 3D organ-like structures (organoids) and microfluidic organ-on-a-chip devices that mimic the structure and function of real tissues, pushing cell culture beyond simple monolayers toward true physiological modeling.

Core Principles of Cell Culture

1. Sterility and Asepsis

2. Culture Media

• Salts and buffers (e.g., NaCl, NaHCO₃) to maintain osmolarity and pH (~7.2-7.4)
• Amino acids and vitamins for biosynthesis
• Glucose as the primary carbon/energy source
• Serum (e.g., fetal bovine serum) or defined growth factors supplying hormones, attachment factors, and mitogens

3. Physical Environment

• Temperature: 37°C (mammalian cells) to mimic body temperature
• Atmosphere: 5% CO₂ in air to maintain bicarbonate buffering of pH
• Humidity: ~95% to prevent evaporation

4. Primary Culture vs. Cell Lines

• Primary cell cultures: Cells dispersed directly from tissues (mechanically or by enzymatic digestion with trypsin/collagenase), plated and grown for a limited number of divisions. Most normal cells have a finite, genetically programmed lifespan (the Hayflick limit).
• Cell lines: Cells that have become immortalized (through spontaneous mutation, oncogene activation, or viral transformation), capable of indefinite proliferation. Examples include HeLa, CHO, and Vero cells. Medical Microbiology 9e notes that "some cell cultures are well established and can be maintained indefinitely."

5. Suspension vs. Monolayer Culture

• Monolayer (adherent) cultures: Cells attach to the surface of plastic/glass dishes and grow as a single layer. Used for most epithelial, fibroblast, and solid-tissue-derived cells (Henry's Clinical Diagnosis, 23e).
• Suspension cultures: Cells grow floating in liquid medium without attachment. Used for blood, bone marrow, and lymphoid cells. Lymphocytes, which do not divide normally, require stimulation with a mitogen (e.g., phytohemagglutinin) to proliferate in culture.

6. Passaging (Subculture)

7. Applications

• Study molecular changes in cancer
• Propagate and analyze viruses, mycoplasma, and some protozoa (strict intracellular organisms that cannot grow on standard bacteriological media)
• Perform genetic and chromosomal analyses (cytogenetics)
• Produce vaccines, antibodies, and recombinant proteins
• Drug discovery and toxicity testing

Key Timeline Summary

• A Brief History of Cell Culture (PMC 2024) - Harrison to organs-on-a-chip review
• Junqueira's Basic Histology: Text and Atlas, 17e - Cell & Tissue Culture section
• Medical Microbiology, 9e - Cell Culture in microbiology context
• Henry's Clinical Diagnosis and Management by Laboratory Methods, 23e - Cell Culture Technique