Annexin x Tunel

Darzynkiewicz, Zbigniew Z_DARZYNKIEWICZ at
Mon Jun 30 17:12:25 EDT 2008

Hello Sania,


Did you examine by microscopy whether bacterial DNA (in the bacteria invading your cells) is not TUNEL-positive? It is possible that being degraded bacterial DNA may become a good primer to terminal transferase and undergoes labeling during the TUNEL reaction. Besides, microscopy is the only sure way to distinguish apoptosis from necrosis. 

Good luck!

Zbigniew Darzynkiewicz, M.D., Ph.D. 

Professor of Pathology and Medicine 
Director, Brander Cancer Research Institute 
New York Medical College 
BSB, Room 438 
Valhalla, N.Y. 10595 

On 27/6/08 13:52, "Sânia Alves dos Santos" <saniasan at> wrote:

Hi Flowers

I'm working with hepatocyte culture, studying the frequency of apoptotic death in cells invaded by bacteria. Using the Tunel staining I've obtaining higher values in comparison to negative control cells (30%). Using Annexin staining the values are very low, about 1-5% of apoptotic cells. Otherwise the PI staining indicate necrosis in about 20% of cells. How can I interprete these results?

Thanks in advance,

Sania Alves dos Santos
Laboratory of Bacteriology
Faculty of Medicine
University of Sao Paulo
tel: (5511) 3061-7029


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