??? their archery is good because their eyes are small?
j*e
17 楼
My guess is, when tumor (primary or metastasis) is formed from a tiny colony , it has enough O2. When it growth larger, it become hypoxic, inflammatory and oxidative in property, which would promote its dissemination and migration.
p*n
18 楼
要想成像锐,光圈就得小,photogear版的都知道
【在 k***n 的大作中提到】 : ??? their archery is good because their eyes are small?
【在 j**e 的大作中提到】 : My guess is, when tumor (primary or metastasis) is formed from a tiny colony : , it has enough O2. When it growth larger, it become hypoxic, inflammatory : and oxidative in property, which would promote its dissemination and : migration.
z*n
20 楼
皮哥说反了吧?
【在 p****n 的大作中提到】 : 要想成像锐,光圈就得小,photogear版的都知道
j*e
21 楼
The problem is, even there are massive blood vessels in tumor, cancer cells are still in hypoxic condition.
another thing is, High concentration of VEGF suddenly, being the guiding factor, will confuse the tumor (blood vessels), who do not know where to move.
Actually, tumor cells do not prefer to use oxygen. The so-called Warburg effect is the observation that most cancer cells predominantly produce energy by a high rate of glycolysis followed by lactic acid fermentation in the cytosol, rather than by a comparatively low rate of glycolysis followed by oxidation of pyruvate in mitochondria like most normal cells. Unlike what we would think, malignant rapidly-growing tumor cells typically have glycolytic rates that are up to 200 times higher than those of their normal tissues of origin; this occurs even if oxygen is plentiful.
Metabolism: Warburg effect revisited http://www.nature.com/nrc/journal/v8/n4/full/nrc2364.html It was Otto Warburg who first noted the difference between metabolism in cancer cells and that in normal adult tissues: cancer cells take up glucose at higher rates than normal tissue but use a smaller fraction of this glucose for oxidative phosphorylation. But how do tumour cells achieve this altered metabolic phenotype? The authors reasoned that tumour tissue switches pyruvate kinase expression from an adult isoform to the embryonic M2 isoform. ORIGINAL RESEARCH PAPERS Christofk, H. R. et al. Pyruvate kinase M2 is a phosphotyrosine-binding protein. Nature 13 Mar 2008 (doi: 10.1038/nature06667) Christofk, H. R. et al. The M2 splice isoform of pyruvate kinase is important for cancer metabolism and tumour growth. Nature 13 Mar 2008 (doi: 10.1038/nature06734)
【在 h******y 的大作中提到】 : Actually, tumor cells do not prefer to use oxygen. The so-called Warburg : effect is the observation that most cancer cells predominantly produce : energy by a high rate of glycolysis followed by lactic acid fermentation in : the cytosol, rather than by a comparatively low rate of glycolysis followed : by oxidation of pyruvate in mitochondria like most normal cells. : Unlike what we would think, malignant rapidly-growing tumor cells typically : have glycolytic rates that are up to 200 times higher than those of their : normal tissues of origin; this occurs even if oxygen is plentiful.