2. In 1951, Lacks, a 30-year-old wife and mother of five, went to Johns Hopkins Hospital in Baltimore for treatment of cervical cancer. She was unable to pay for treatment and stayed in a segregated ward. During a procedure to place radium on her tumor, Lacks's doctor cut a sliver from the tumor, placed it in a petri dish, and handed it off to the lab assistant of George Gey, a Johns Hopkins cancer researcher. Sadly, cervical cancer is a particularly pernicious disease, and Henrietta succumbed in October 1951 after a brief but terribly painful struggle, leaving behind her young children.
3. George Gey had been trying unsuccessfully to grow human cells in culture-until Henrietta's cells arrived, Labeled HeLa, Henrietta's cancer cells doubled in culture within 24 hours - and they never stopped. Hela cells multiplied so rapidly and persistently, Gey eventually began giving them away to other researchers, According to Skloot, HeLa became the "workhorse" of research labs everywhere. They were used to test the polio vaccine and in the development of HIV medications and cancer treatments. HeLa cells were central to the development ofthe HPV vaccine and were some of the first human cells sent into space to determine how zero gravity affected human cellular activity.
HeLa cells are considered immortal because
HeLa cells are considered immortal because they multiplied every 24 hours in culture and never stopped.
The term "immortal" in this context refers to the unique ability of HeLa cells to divide indefinitely in vitro when supplied with appropriate growth conditions. Unlike normal human cells, which have a limited life span and cease to divide after a certain number of cell division cycles, HeLa cells continue to reproduce and maintain their viability indefinitely, as long as they are properly cared for.
While HeLa cells are indeed resilient and have been used in toxicology studies, their immortality is not defined by their resistance to toxins. Instead, their immortality pertains to their continuous division and proliferation under ideal growth conditions. Resistance to toxins may be an attribute of some cultures of HeLa cells but it is not the defining characteristic of their immortality.
HeLa cells have indeed played a pivotal role in various medical advances, including research towards treatments for HIV and cancer. However, their contribution to these medical breakthroughs is not the reason they are considered immortal. The immortality of HeLa cells pertains to their unique capacity for endless replication in a laboratory setting, not the specific applications of this capability.
This is the correct answer. The unique property of HeLa cells to continuously divide and proliferate in culture, without showing signs of senescence or programmed cell death, is the reason they are termed "immortal." Each cell division cycle typically completes in about 24 hours, and this process continues indefinitely, leading to the production of a virtually unlimited number of cells from a single original cell.
HeLa cells are not used to cure diseases by injecting them into patients. In fact, injecting HeLa cells into patients would likely be harmful, as they are cancer cells and could potentially form tumors. Their use is predominantly confined to laboratory research and drug testing.
HeLa cells are referred to as "immortal" because of their unique ability to divide indefinitely in culture, a characteristic that is not shared by normal human cells. While they have been instrumental in various medical advances, their specific contributions to disease research and treatment are not the reason for their immortality. The concept of cellular immortality in HeLa cells pertains solely to their endless replication potential in laboratory conditions.
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