Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Internal mechanism found to be responsible for the limitless growth potential of epithelial tumors

11.09.2017

Researchers at IRB Barcelona reveal the capacity of epithelial-derived tumors to grow in the absence of a microenvironment

Researchers from the Development and Growth Control Laboratory at IRB Barcelona have identified the cell types and molecular mechanism responsible for the unlimited growth potential of epithelial tumours (carcinomas) and demonstrated that the growth of these tumours is independent of its microenvironment. "In epithelial tumours caused by chromosomal instability or loss of cell polarity, the interaction between two tumour cell populations drives malignant growth," explains Marco Milán, ICREA Research Professor and head of the laboratory.


Tumor (red) covered by collagen (green), which is being deposited by cells of the immune system (cyan).

Image: Mariana Muzzopappa, IRB Barcelona

Published in the journal Proceedings of the National Academy of Sciences (PNAS) as a cover story of its 35 Issue, the study analyses solid tumours of epithelial origin in the fruit fly Drosophila melanogaster. "We have induced tumour development in two ways--by generating genomic instability and the loss of cell polarity. We have validated the causal relation between these two conditions--which are frequently observed in carcinomas--and the development of tumours," explains Mariana Muzzopappa, first author of the study and postdoctoral fellow in the Development and Growth Control Lab.

Independent of the tumour microenvironment

To study the effect of the microenvironment on tumour development, the researchers examined tumour growth in the absence of adjacent cell populations, such as cells of the immune system or mesenchymal cells, which can act as a niche by supplying tumours with growth factors. The scientists observed that the tumour continued to grow in the absence of these two cell types.

Furthermore, they demonstrated that "the growth of epithelial tumours is dependent on activation of the JNK stress signalling pathway and that this pathway is intrinsically activated in the tumour, regardless of its microenvironment," highlights Marco Milán.

Interactions between two tumour cell populations

The researchers have identified two functionally distinct cell populations within the tumour--one that proliferates and ones that does not--upon which internal growth mechanisms depend. "JNK is activated in a group of non-proliferating cells, namely those that show the highest degree of chromosomal instability or that have lost polarity. JNK triggers the expression of growth factors and makes those cells still in the epithelium to go on proliferating. The continued proliferation of these cells leads to an increase in chromosomal instability and the loss of epithelial polarity in the tumours. Consequently, the number of cells expressing growth factors rises. These cross-feeding interactions explain the unlimited growth potential of these epithelial tumours," says Muzzopappa.

The mechanism of JNK activation differs depending on the tumour. "We have observed that tumours derived from chromosomal instability are induced by oxidative stress caused by ROS (reactive oxygen species), which triggers JNK. The mechanism in tumours that arise from the loss of cell polarity differs," explains Marco Milán.

The results of this study shed further light on the causal relationship between chromosomal instability, loss of epithelial polarity and tumorigenesis and open new avenues for the search of therapeutic targets.

###

This study was supported by the Ministry of Economy, Industry and Competitiveness (MINECO) through ERDFs "A way to build Europe" and "la Caixa" Foundation PhD programme, that supports Lada Murcia PhD student.

Reference article:

Mariana Muzzopappa, Lada Murcia and Marco Milán

Feedback amplification loop drives malignant growth in epithelial tissues

PNAS (2017): doi: 10.1073/pnas.1701791114

Media Contact

Sònia Armengou
armengou@irbbarcelona.org
34-934-037-255

http://www.irbbarcelona.org 

Sònia Armengou | EurekAlert!

Further reports about: IRB cell polarity cell populations chromosomal epithelial microenvironment polarity tumour

More articles from Life Sciences:

nachricht New application for acoustics helps estimate marine life populations
16.01.2018 | University of California - San Diego

nachricht Unexpected environmental source of methane discovered
16.01.2018 | University of Washington Health Sciences/UW Medicine

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Novel 3-D printing technique yields high-performance composites

16.01.2018 | Materials Sciences

New application for acoustics helps estimate marine life populations

16.01.2018 | Life Sciences

Fast-tracking T cell therapies with immune-mimicking biomaterials

16.01.2018 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>