Células naturais assassinas adormecem metastases do cancro da mama

envie a um amigo share this

Células naturais assassinas adormecem metastases do cancro da mama

Quarta, 09.06.2021

Após a remoção de um cancro existe sempre o risco da persistência de células tumorais que não é possível detectar e que, mais tarde ou mais cedo, se transformam num problema difícil de resolver. Estas células do tumor primario viajam pelo organismo e acabam por se instalar noutros órgãos, onde permanecem “adormecidas” até eventualmente despertarem como metástases. Uma equipa de investigadores na Suíça publicou um artigo na Nature, coordenado pela cientista portuguesa Ana Luisa Correia, que fala sobre um especial grupo de células que pode impedir o desenvolvimento de metástases no fígado após a remoção de um tumor da mama, e aponta para novas estratégias terapêuticas que garantam o sono destas celulas durante muito, muito tempo.

 

Autores e afiliações:

Ana Luísa Correia1,2,3*, Joao C. Guimaraes4,11, Priska Auf der Maur1,3, Duvini De Silva1,2,11, Marcel P. Trefny1, Ryoko Okamoto1,2,3,12, Sandro Bruno2,13, Alexander Schmidt5, Kirsten Mertz6, Katrin Volkmann1,3, Luigi Terracciano7, Alfred Zippelius1,8, Marcus Vetter8,9, Christian Kurzeder9,10, Walter Paul Weber3,10, and Mohamed Bentires-Alj1,2,3*

1 Department of Biomedicine, University of Basel, Basel, Switzerland

2 Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland

3 Department of Surgery, University Hospital Basel, Basel, Switzerland

4 Computational and Systems Biology, Biozentrum, University of Basel, Basel, Switzerland

5 Proteomics Core Facility, Biozentrum, University of Basel, Basel, Switzerland

6 Institute of Pathology Liestal, Cantonal Hospital Basel-land, Liestal, Switzerland

7 Institute of Pathology, University Hospital Basel, Basel, Switzerland

8 Department of Medical Oncology, University Hospital Basel, Basel, Switzerland

9 Gynecologic Cancer Center, University Hospital Basel, Basel, Switzerland

10 Breast Center, University of Basel and University Hospital Basel, Basel, Switzerland

11 Present address: F. Hoffmann-La Roche AG, Basel, Switzerland

12 Present address: Department of Biosystems Science and Engineering, ETH Zürich, Basel, Switzerland

13 Present address: Novartis Institutes for BioMedical Research, Basel, Switzerland

 

Abstract:

The persistence of undetectable disseminated tumour cells (DTCs) after primary tumour resection poses a major challenge to effective cancer treatment1,2. These enduring dormant DTCs are seeds of future metastases, and the mechanisms that switch them from dormancy to outgrowth require definition. Because cancer dormancy provides a singular therapeutic window to prevent metastatic disease, a comprehensive understanding of the distribution, composition and dynamics of dormant DTC reservoirs is imperative. Here we reveal tissue-specific microenvironments that restrain or allow progression of breast cancer in the liver, a frequent site of metastasis3 and often associated with patients’ cause of death4. Using mouse models, we show that the dormant milieu features a selective rise in natural killer (NK) cells. Adjuvant interleukin-15-based immunotherapy ensures an abundant NK cell pool that sustains dormancy through interferon-γ signalling, preventing hepatic metastases and prolonging survival. Exit from dormancy follows a dramatic contraction of the NK cell compartment and concurrent accumulation of activated hepatic stellate cells (aHSCs). Our proteomics studies on liver co-cultures implicate the chemokine CXCL12 secreted by aHSCs in inducing NK cell quiescence via its cognate receptor CXCR4. Expression of CXCL12 and aHSC abundance are closely correlated in patients with liver metastases. Our data identify the interplay between NK cells and aHSCs as a master switch of cancer dormancy, and suggest that therapies aimed at normalizing the NK cell pool might succeed in preventing metastatic outgrowth.

 

Revista: Nature

 

Link: https://www.nature.com/articles/s41586-021-03614-z

 

Open source link: https://rdcu.be/clOfV