1
$\begingroup$

What are the main differences between lab-grown tissues and natural tissues from living animals?

Using a biologist's classic "structure (anatomy) and function (physiology)" idea, I thought about the followings:

Structure:

  • It might be difficult to recreate the composition of different tissues / cells in living things precisely with artificial methods. This may lead to bad results when the tissue is used for tests of medicines and cosmetics.

Function:

  • Cells might not function and produce as expected (or is harder to make them function) in artificial compositions, as cells need strictly regulated environments to function correctly.

Also, I think using artificial tissues for drug tests helps researchers to avoid ethical issues which may arise if they use living animals instead. I think the cost is generally higher to make artificial tissues than to gather test animals; however I am not sure if this applies to every case - maybe some tissues are relatively cheap to grow in labs.

What are some other differences? The answer can be about the advantages and the disadvantages of making / using lab-grown tissues and using living animals as well.

$\endgroup$
2
  • $\begingroup$ Does Lab-meat fit in this? $\endgroup$ Commented Aug 12, 2014 at 4:33
  • $\begingroup$ @DevashishDas hmm... I guess yes. $\endgroup$
    – hello all
    Commented Aug 12, 2014 at 4:48

2 Answers 2

0
$\begingroup$

Immortalized cell lines are often cancerous, which has large effects on their gene expression profiles. They also adapt to cell culture conditions after several hundred passages in culture. I've cultured both HepG2 cells and primary mouse hepatocytes. The HepG2 are a hepatocellular carcinoma line and grow fine in culture, while the primary hepatocytes don't really grow in culture and only live for a few days after you extract them from a mouse. We were doing gene transfer assays with both sets of cells. The quickly dividing HepG2 cells were easy to transform using PEI, and while primary hepatocytes could be transformed with PEI, they worked better with calcium phosphate, probably because it was less toxic. I noticed that HepG2 cells were smaller than primary hepatocytes, and the primaries were far more fragile, we could run HepG2 through a peristaltic pump with no problems, but had to handle all the primary cells by hand.

As far as cost goes, tissue culture is almost always cheaper. You can make a bottle of media for a few dollars worth of material and use it for several passages. The cost of running an incubator and biosafety cabinet are also minimal. So unless you're doing something unusual, cell culture is affordable. However, it's an incomplete model at best. Trying to create whole tissues in the lab counts as unusual.

Doing work with animals is far more accurate than cell culture, but much more expensive. Our mice are cheap, but still cost about a dollar each, and about 20 cents a day for housing. A typical biodistribution experiment will use 3 mice per time point and 8 - 10 time points, so 24 to 30 mice assuming no mistakes during dosing. On top of that, doing animal work has a lot more bureaucracy involved, with animal use protocols and approvals and inspections.

The question about whether to use animal models vs cell culture comes down to what you're trying to accomplish. If you're studying gene regulation or protein interactions, cell culture usually works better because it's more amenable to gene transfer and allows you to use techniques like fluorescent fusion proteins and bioconjugation. If you're studying drug metabolism and toxicity you should use whole animals because the interactions between metabolites and specific tissues are hard to reproduce in cell culture. In some far off future we may be able to totally replace animal models with cell culture or even computer models, but we're not even close.

$\endgroup$
-1
$\begingroup$

Natural tissue are living at body temperature in homeostasic conditions. They are organized with other tissues and organs. An incubator at 37 0C incubator, growth factors and medium is added in an artifical culture flask for tissue culture. There are then primary lines which are derived from humans and cultured exvivo requires careful handling and secondary cell lines which are established. Secondary cells and tissues can be engineered with addition and deletion of genes. Many labs use. Primary cells then have to authenticated senescence stop dividing if not cancerous. A characterisation only if there is suspicion of contamination with other lines. Where characterisation of morphology of cells with lesser numbers are present can be visual may be sparse and also when establishing pure culture.

$\endgroup$

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .