L1210 cells

Key takeaways

L1210 cells belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect L1210 cells to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of L1210 cells from memory before moving on to harder problems.

Reference excerpt

L1210 is a mouse lymphocytic leukemia cell line utilized in cancer research. L1210 cells are used to investigate new chemotherapeutic agents and as a model for observing drug resistance mechanisms in cancer treatment. These cells were originally derived from a mouse with lymphocytic leukemia.

History In 1954, Dr. Lloyd Law isolated the L1210 cell line by exposing DBA/2 mice to the chemical carcinogen 3-methylcholantrene. The cell line originated from the ascitic fluid of an 8-month-old female DBA/2 strain mice with lymphoid leukemia. This was done by painting the skin with methylcholantrene, which induces tumors to allow researchers to study the process of cancer development. The L1210 cells were implanted intraperitonealy (ip) through diluted ascitic fluid containing 105 L1210 cells per animal. The L1210 cells exhibited median death days ranging from 6.4 to 9.9 days and tumor doubling times ranging from 0.34 to 0.46 days. These L1210 cells are lymphocytic B-cells, but have a lymphoblast morphology. These cells grow aggressively and have a high proliferative capacity, which makes L1210 cells ideal for studying leukemia pathogenesis. Lastly, L1210 cells grow rapidly in vitro and can maintain a suspension culture. This makes them ideal for in vivo experiments and in vitro assays. In the early 1960s and 1970s, the Division of Cancer Treatment of the National Cancer Institute started using mouse leukemia models for their drug discovery programs. The L1210 cells played a major role in evaluations of potential anticancer agents. These models are still used today to study the mechanisms of drug resistance.

Resistance mechanism

To study their resistance mechanism, L1210 cells were treated with amethopterin. Cells that showed resistance to amethopterin also showed an increase in dihydrofolate reductase (DHFR) activity. This increased DHFR activity leads to abnormal cell proliferation and is associated with tumor resistance to amethopterin (methotrexate), a common chemotherapy drug. The resistance of L1210 cells is also due to the absence of a subtelocentric (ST) marker chromosome, which suggests that chromosomal alterations are also involved in the development of resistance. L1210 cells that showed a lack of ST marker chromosomes showed resistance to amethopterin, associating this resistance with chromosomal change. To summarize, the resistance mechanism of L1210 cells to amethopterin is associated with an increase in DHFR activity and the absence of the ST marker chromosome. This emphasizes the role of genetic mutations that leads to the development of drug resistance.

Multidrug resistance studies Development of multidrug resistance (MDR) is a major challenge in cancer treatment. In order to study this, L1210 cell sub-lines like L1210/VCR-1 and L1210/VCR-2 are developed to study the mechanisms of MDR. These sub-lines are developed as resistant to common chemotherapy drugs. L1210/VCR-1 and L1210/VCR-2 are resistant to vincristine.

In one study that focused on the resistance of L1210/VCR to vincristine, L1210 cells were cultured in increasing concentrations of vincristine over a long period of time to develop L1210/VCR. L1210/VCR represents the resistant sub-line, while L1210 cells were used as a control. To test for vincristine sensitivity, the cells were cultured in RPMI 1640 medium. The IC50 value was used to determine vincristine sensitivity. In addition, a Western blot using monoclonal antibody C219 was used to determine the over expression of membrane P-glycoprotein (Pgp). The results showed that L1210/VCR had an IC50 value 200 times higher than L1210 cells, a significantly higher resistance to vincristine. L1210/VCR also exhibited interactions with the C219 antibody in the Western blot, which did not occur in the L1210 cells. This indicates that Pgp over expression is associated with multidrug resistant cells. This study shows how longterm adaptation to a chemotherapy drug can cause changes and consequently, resistance to these drugs. It also demonstrates a method of using L1210 cells and its sub-lines to test and better understand multidrug resistance.

Applications in cancer research The L1210 leukemia cell line can be injected into test recipients and will cause the recipients to develop leukemia. This allows for the evaluation of the anti-leukemia efficiency of chemotherapy drugs by methods such as screening for antimetabolites and the efficiency of topoisomerase II inhibitors. Another way researchers can use L1210 cells in cancer research is by studying the pathogenesis of leukemia to learn how the disease develops and progresses. Lastly, L1210 cells also allows researchers to investigate the mechanisms of drug resistance. The L1210 cell lines exhibits responsiveness to a variety of chemotherapy agents, making it a valuable cell line to evaluate pre-clinical drugs and studying drug resistance mechanisms. It also serves as a model to understand the immune response to leukemia by providing information on how the L1210 cells interact with the host's immune system. This includes studies of cytokine production, tumor immunology, and chemotherapy drug efficiency. The L1210 cell line still plays a critical role in leukemia research and continues to contribute to advances in therapeutic developments and cancer biology.

References

Illustrations

Worked examples

Example 1 — a first encounter with L1210 cells

Start with the simplest possible case. Write down what L1210 cells claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to L1210 cells before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about L1210 cells ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of L1210 cells

In research: L1210 cells appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses L1210 cells in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: L1210 cells is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cell lines, so understanding it makes those chapters shorter.
In everyday life: Look for L1210 cells outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study L1210 cells in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what L1210 cells means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain L1210 cells out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is L1210 cells in simple terms?

L1210 is a mouse lymphocytic leukemia cell line utilized in cancer research. L1210 cells are used to investigate new chemotherapeutic agents and as a model for observing drug resistance mechanisms in cancer treatment.

Why does L1210 cells matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study L1210 cells?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on L1210 cells.