Isolation and separation of murine tumor-associated macrophages (TAMs) subpopulations from orthotopic 4T1 breast tumors.

Tumor-associated macrophages (TAMs) are highly heterogenous regarding their intratumoral localization, surface marker expression, and molecular properties. This protocol describes the complete procedure for isolation and digestion of murine breast cancer samples and fluorescence-activated cell sorting (FACS) of TAMs from murine orthotopic 4T1 breast tumors. This includes steps to separate PoEMs (podoplanin-expressing macrophages) and non-PoEMs (podoplanin-negative macrophages).

DNA methylation repels binding of hypoxia-inducible transcription factors to maintain tumor immunotolerance.

Background: Hypoxia is pervasive in cancer and other diseases. Cells sense and adapt to hypoxia by activating hypoxia-inducible transcription factors (HIFs), but it is still an outstanding question why cell types differ in their transcriptional response to hypoxia.

Results: We report that HIFs fail to bind CpG dinucleotides that are methylated in their consensus binding sequence, both in in vitro biochemical binding assays and in vivo studies of differentially methylated isogenic cell lines.

Podoplanin-Expressing Macrophages Promote Lymphangiogenesis and Lymphoinvasion in Breast Cancer.

Among mammary tumor-infiltrating immune cells, the highest expression of podoplanin (PDPN) is found in a subset of tumor-associated macrophages (TAMs). We hereby demonstrate that PDPN is involved in the attachment of this TAM subset to lymphatic endothelial cells (LECs). Mechanistically, the binding of PDPN to LEC-derived galectin 8 (GAL8) in a glycosylation-dependent manner promotes the activation of pro-migratory integrin β1.

Retinoid X receptor suppresses a metastasis-promoting transcriptional program in myeloid cells via a ligand-insensitive mechanism.

Retinoid X receptor (RXR) regulates several key functions in myeloid cells, including inflammatory responses, phagocytosis, chemokine secretion, and proangiogenic activity. Its importance, however, in tumor-associated myeloid cells is unknown. In this study, we demonstrate that deletion of RXR in myeloid cells enhances lung metastasis formation while not affecting primary tumor growth.

MIF-Mediated Hemodilution Promotes Pathogenic Anemia in Experimental African Trypanosomosis.

Animal African trypanosomosis is a major threat to the economic development and human health in sub-Saharan Africa. Trypanosoma congolense infections represent the major constraint in livestock production, with anemia as the major pathogenic lethal feature. The mechanisms underlying anemia development are ill defined, which hampers the development of an effective therapy.

Growth Inhibition of Osteosarcoma Cell Lines in 3D Cultures: Role of Nitrosative and Oxidative Stress.

Background: 3D cell cultures have revolutionized the understanding of cell behavior, allowing culture of cells with the possibility of resembling in vivo intercellular signaling and cell-extracellular matrix interaction.

Aim: The effect of limited oxygen penetration into 3D culture of highly metastatic osteosarcoma 143B cells in terms of expression of nitro-oxidative stress markers was investigated and compared to standard 2D cell culture.

Materials And Methods: Human osteosarcoma (143B cell line) cells were cultured as monolayers, in collagen and Matrigel.