Macrophage regulation of tumor responses to anticancer therapies

Michele De Palma1, Claire E Lewis

  • 1The Swiss Institute for Experimental Cancer Research (ISREC), School of Life Sciences, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland. michele.depalma@epfl.ch

Cancer Cell
|March 23, 2013
PubMed

Insights

Tumor-associated macrophages (TAMs) play a dual role in cancer, influencing treatment efficacy and driving tumor progression. Targeting TAMs offers a promising strategy to enhance current cancer therapies.

Area of Science:

  • Immunology
  • Oncology
  • Cancer Biology

Background:

  • Tumor-associated macrophages (TAMs) are critical regulators of the tumor microenvironment.
  • TAMs influence tumor progression, including angiogenesis, immunosuppression, invasion, and metastasis.
  • The role of TAMs in treatment response is context-dependent, affecting chemotherapy, antibody therapy, and immunotherapy.

Purpose of the Study:

  • To review the biological significance of TAMs in cancer.
  • To discuss the clinical implications of TAMs in various cancer treatments.
  • To highlight novel strategies for targeting TAMs to improve therapeutic efficacy.

Main Methods:

  • Literature review and synthesis of existing research on TAMs.
  • Analysis of TAMs' roles in tumor progression and treatment response.
  • Discussion of emerging therapeutic approaches targeting TAMs.

Main Results:

  • TAMs promote key aspects of tumor progression.
  • TAMs can either enhance or inhibit the effectiveness of diverse cancer treatments.
  • TAMs are involved in tumor repair following radiotherapy and anti-angiogenic treatments.

Conclusions:

  • Understanding TAM biology is crucial for cancer treatment optimization.
  • Targeting TAMs presents a viable strategy to overcome treatment resistance.
  • Novel TAM-targeting therapies hold potential for improving patient outcomes in oncology.

Related Concept Videos

The Tumor Microenvironment02:17

The Tumor Microenvironment

Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
Tumor Immunotherapy01:27

Tumor Immunotherapy

Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
Inflammatory Response01:28

Inflammatory Response

An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...