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The Tumor Microenvironment

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...

The Tumor Microenvironment

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 Immunotherapy

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 Response

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,...

Chronic Inflammation: Introduction

Chronic Inflammation: Introduction

Chronic inflammation is a prolonged, dysregulated immune response that persists for weeks to years when the inciting stimulus is difficult to eradicate or when self‑antigens drive ongoing reactivity. Morphologically, it is defined by mononuclear cell infiltration, progressive tissue destruction, and concurrent attempts at healing via angiogenesis and fibrosis. Compared with acute inflammation, edema is less prominent while cellular infiltration predominates; triggers include persistent...

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...

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Related Experiment Video

Updated: Jun 6, 2026

Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports

Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports

Published on: November 28, 2019

Inflammation and immunity in the tumor environment.

C Maletzki¹, J Emmrich

¹Department of Gastroenterology, University Clinic Rostock, Rostock, Germany.

Digestive Diseases (Basel, Switzerland)

|November 20, 2010

Summary

Investigating Streptococcus pyogenes in a mouse model, this study found that local bacteria application effectively triggered an immune response, leading to complete tumor regression in pancreatic cancer. Further research aims to optimize bacterial immunotherapy.

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Analysis of Human T Cell Activity in an Allogeneic Co-Culture Setting of Pre-Treated Tumor Cells

Analysis of Human T Cell Activity in an Allogeneic Co-Culture Setting of Pre-Treated Tumor Cells

Published on: March 7, 2025

Related Experiment Videos

Last Updated: Jun 6, 2026

Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports

Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports

Published on: November 28, 2019

Analysis of Human T Cell Activity in an Allogeneic Co-Culture Setting of Pre-Treated Tumor Cells

Analysis of Human T Cell Activity in an Allogeneic Co-Culture Setting of Pre-Treated Tumor Cells

Published on: March 7, 2025

Area of Science:

Oncology
Immunology
Microbiology

Background:

Inflammation and innate immunity are closely linked to cancer development.
Tumor microenvironments feature infiltrating leukocytes, cytokines, and chemokines, influencing cancer progression.
Understanding the inflammation-cancer nexus is crucial for developing novel cancer prevention and therapy strategies.

Purpose of the Study:

To explore the potential of Streptococcus pyogenes for bacteria-related immune responses against tumor cells.
To evaluate the efficacy of Streptococcus pyogenes in inducing tumor regression.
To investigate the use of bacteria as an immunotherapeutic approach for cancer treatment.

Main Methods:

Utilized the aggressively growing and poorly immunogenic Panc02 mouse model for pancreatic carcinoma.
Administered Streptococcus pyogenes locally to the tumor site.
Monitored tumor response and regression following bacterial application.

Main Results:

Local application of Streptococcus pyogenes resulted in complete tumor regression in the Panc02 model.
Demonstrated a bacteria-related immune response against tumor cells.
Confirmed the potential of bacteria in mediating anti-tumor effects.

Conclusions:

Streptococcus pyogenes can effectively induce tumor regression through a localized immune response.
Bacterial immunotherapy holds promise for cancer treatment, particularly for pancreatic cancer.
Future research should focus on optimizing live bacteria or bacterial components for enhanced immunotherapeutic approaches.