Originally posted by: Gibsons
Originally posted by: Eli
Originally posted by: Gibsons
It still has the same targeting problem that every approach in these "may be a cure" articles has. They're using antibodies for their targeting, so nothing particularly new there. If there were a really good way to specifically target cancer cells, we would have had a cure a very long time ago.
Could possibly result in improved treatment for some cancers. But won't be useful at all against others.
Explain further, please?
I didn't see a mention of antibodies in the article...
There are all kinds of ways to kill cells. bazillions. The trick is killing tumor cells, ALL tumor cells, and leaving host cells alone. That's a Nobel.
The article doesn't mention it because it's popular press...
In the research article (in Nature Biotechnology), they state (pardon the formatting it's from the PDF):
We used BsAb to target recombinant minicells to tumor cells,
as described previously9. One arm of these antibodies recognizes
the O-polysaccharide component of the minicell surface lipopolysaccharide
and the other, a tumor-preferential cell surface?receptor,
such as the epidermal growth factor receptor (EGFR), which is
overexpressed in several cancers19
BsAb = bi-specific antibodies.
So, EGFR is expressed on some cancer cells and you can target those cells with antibodies. They used a human tumor cell line (uterine) known to express EGFR, put it into nude mice and used their approach to treat the mice. It's easier to be specific that way, as the mouse host cells don't express human EGFR.
Not all tumors have a convenient marker on their surface. There are cytotoxic antibody approaches that have been available for years (I would a assume some against EGFR) and have been used with mixed results.
The other thing I'd worry about is an immune response against these mini cells. The minicells are basically bacterial and contain some really highly immunogenic molecules, including the lipopolysaccharide they mention. This won't be a problem in nude mice, but could be a problem in anything with a functional immune system. I didn't read closely enough to see if they addressed that.