Discuss the factors that control the division of eukaryotic cells grown in the laboratory. Cancer cells are easier to grow in the lab than other cells. Why do you suppose this is?

The cell cycle is a series of phases that a eukaryotic cell goes through to divide and replicate. Regulation of this cycle is crucial, as it involves checkpoints that ensure the cell is ready to proceed to the next phase. Factors such as cyclins and cyclin-dependent kinases (CDKs) play significant roles in controlling these transitions, and disruptions in this regulation can lead to uncontrolled cell division, a hallmark of cancer.

Growth factors are proteins that stimulate cell division and proliferation. In laboratory settings, the presence or absence of specific growth factors can significantly influence the ability of cells to grow and divide. Cancer cells often have altered signaling pathways that allow them to bypass the need for these external signals, making them more adaptable and easier to culture compared to normal cells.

Cellular senescence is a state where cells lose the ability to divide and grow, often as a response to stress or damage. Normal somatic cells have a limited number of divisions before entering senescence, influenced by telomere shortening and other factors. In contrast, cancer cells can evade senescence, allowing them to proliferate indefinitely, which contributes to their ease of growth in laboratory conditions.