Navigation Links
Moffitt Cancer Center researchers find acidic pH microenvironments in tumors aid tumor cell survival
Date:9/5/2012

Researchers at Moffitt Cancer Center and colleagues at the University of South Florida and Wayne State University have discovered that tumor cell survival relies on adaptation to acidic conditions in the tumor microenvironment. Their research investigating the effects of acidity on breast and pancreatic cancer cell lines revealed the importance of autophagy in acidic microenvironments and suggests that a successful treatment strategy might be based on this autophagic dependence.

The study appears as the cover story for the Aug. 15 issue of Cancer Research, a publication of the American Association for Cancer Research.

"Cancer progression is a multistep process strongly influenced by the physical properties of the tumor microenvironment," said Robert J. Gillies, Ph.D., corresponding author of the study and chair of Moffitt's Department of Cancer Imaging and Metabolism. "Both low oxygen and high acidity can be cytotoxic. Our research suggests that adaptation to these stressful conditions involves autophagy allowing cancer cells to survive, proliferate and eventually metastasize to secondary sites."

According to the authors, not much is known about cell survival mechanisms under acidic conditions, but it has been demonstrated that acidosis can alter gene expression leading to cell types that are adapted for growth and survival in low pH conditions. Identifying low pH survival mechanisms would "give further insight into tumor progression and potentially introduce novel therapeutic strategies," researchers said.

In this study, the researchers tested cancer cell lines under acidic conditions to learn more about autophagy and cellular adaptation. They noted that normal cells in the acidic environment can respond to acidic stress by increasing cell death pathways, thus introducing the need for survival and adaptive mechanisms by cancer cells.

The researchers also noted that their experiments were carried out under atmospheric oxygen levels and they found that the cell's stress response could lead to chronic autophagy even when nutrients and oxygen were in adequate supply.

"We found that cells subjected to transient and chronic low pH growth conditions demonstrate elevated markers for autophagy and are dependent on this process for prolonged survival in acidic environments," explained Jonathan W. Wojtkowiak, lead author of the study and postdoctoral fellow at Moffitt. "A hallmark of cancer is the ability of cancer cells to evade apoptosis. Autophagy supports this by playing a tumor promoter and survival role under certain circumstances during different stages of tumorogenesis."

Their study demonstrated the importance of autophagy in low pH-adapted breast and pancreatic cancer cell lines and the dependence of these cells on autophagy for survival to acidic tumor microenvironment. According to the researchers, they identified a potential therapeutic strategy of using an autophagy inhibitor, one that does not affect cells under neutral conditions.


'/>"/>

Contact: Kim Polacek
kim.polacek@moffitt.org
813-745-7408
H. Lee Moffitt Cancer Center & Research Institute
Source:Eurekalert

Related medicine news :

1. Review finds some evidence for chemo brain in breast cancer survivors, Moffitt Cancer Center says
2. Moffitt Cancer Center researchers and colleagues identify PHF20, a regulator of gene P53
3. Moffitt Cancer Center melanoma expert reviews unique adverse events with newly approved drug
4. Moffitt Cancer Center researchers validate molecular signature to predict radiation therapy benefit
5. Moffitt Cancer Center researchers discover how cancer cells hijack a mechanism to grow
6. Attitudes toward outdoor smoking ban at moffitt Cancer Center evaluated
7. Moffitt Cancer Center researcher & colleagues test new drug for patients with neuroendocrine tumors
8. Moffitt Cancer Center researchers find potential key to new treatment for mantle cell lymphoma
9. Moffitt Cancer Center study validates activity of rare genetic variant in glioma
10. Moffitt researchers find cutaneous human papillomavirus infection a risk factor for skin cancer
11. Moffitt Cancer Center researchers test drug combinations to prevent graft vs. host disease
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/29/2016)... ... April 29, 2016 , ... The American workforce is on ... security. Most importantly, employees are the single most important asset in creating value ... unhappy? , Just under half of American workers are emotionally checked out with ...
(Date:4/29/2016)... ... April 29, 2016 , ... The White ... repaying their loans, more information about their loan terms and accounts, and more ... loan debt, including federal and private loans, has reached $1.3 trillion, with 43 ...
(Date:4/29/2016)... ... April 29, 2016 , ... Coast Dental Fort Stewart is celebrating ... new location in the Exchange Furniture Mall at 112 Vilseck Road in Fort Stewart. ... Smart TV. Plus attendees will have the opportunity to meet general dentists Thomas Richards, ...
(Date:4/29/2016)... ... April 29, 2016 , ... Spine Team Texas, a comprehensive spine physician group ... of their physicians has been invited to be a featured speaker at the Texas ... conference on April 30, 2016. , Dr. R. Scott McPherson, a physical medicine ...
(Date:4/29/2016)... ... April 29, 2016 , ... Mobility Designed is redefining mobility with ... armpits, the M+D Crutch evenly distributes body weight from the elbow to the forearm. ... using the crutches than with other crutches. , Co-founders Max and Liliana Younger were ...
Breaking Medicine News(10 mins):
(Date:4/27/2016)... Elekta today announced that its ... the focal point of seven scientific presentations at ESTRO ... Radiotherapy & Oncology, taking place April 29 - May ... system and a high-field MRI scanner with sophisticated software ... anatomy in real time. The MR-linac is designed to ...
(Date:4/27/2016)... April 27, 2016  Bayer Animal Health today ... from the University of Florida College of Veterinary ... Excellence in Communication Award (BECA). Brittany was selected ... awarded a total of $70,000 in scholarship funds ... years, Bayer has provided a total of $232,500 ...
(Date:4/27/2016)... , April 27, 2016 ... USD 2.14 billion by 2022, according to a ...      (Logo: http://photos.prnewswire.com/prnh/20150105/723757 ) , ... affecting the efficiency and accuracy delivered by the ... demand for novel urinalysis instruments and consumables. For ...
Breaking Medicine Technology: