Related Experiment Video

Updated: Oct 9, 2026

Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
10:07

Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages

Published on: June 23, 2013

MAP kinase activation in macrophages

K M Rao1

  • 1Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA. mir8@cdc.gov

Journal of Leukocyte Biology
|February 24, 2001
PubMed

Insights

Stimulating macrophages activates mitogen-activated protein kinases (MAPKs). Research highlights differences in MAPK activation between cell lines and primary cells, emphasizing the need for primary cell studies.

Area of Science:

  • Immunology
  • Cell Biology
  • Signal Transduction

Background:

  • Macrophages are crucial immune cells activated by various stimuli.
  • Mitogen-activated protein kinases (MAPKs) are key signaling molecules involved in cellular responses.
  • Understanding MAPK activation pathways in macrophages is essential for immunology and disease research.

Purpose of the Study:

  • To explore the mechanisms of MAPK activation in macrophages.
  • To investigate the roles of specific signaling molecules in TNF-alpha-induced MAPK activation.
  • To compare MAPK activation in different macrophage populations and cell types.

Main Methods:

  • Review of existing literature on MAPK signaling pathways.
  • Discussion of molecular players like CD14, Toll receptors, TRADD, FADD, MADD, TRAFs, ASK1, GCK, HPK1, and GCKR.
  • Consideration of data from knockout mice and mutant cell lines.

Main Results:

  • Lipopolysaccharide (LPS)-induced MAPK activation involves CD14 and Toll receptors.
  • Tumor necrosis factor-alpha (TNF-alpha)-induced MAPK activation engages death domain proteins and TRAFs.
  • MAPK activation pathways can differ significantly between cell lines and primary macrophages.
  • Macrophages from different compartments exhibit distinct receptor and signaling molecule expression.

Conclusions:

  • Primary macrophages are crucial for studying MAPK signal transduction pathways.
  • Extrapolation of MAPK activation data from cell lines to primary cells may be inaccurate.
  • Differences in MAPK activation reflect distinct macrophage phenotypes and functions.

More Related Videos

Reprograming Model of Human Monocyte-derived Macrophages for In-vitro Assays08:37

Reprograming Model of Human Monocyte-derived Macrophages for In-vitro Assays

Published on: April 18, 2025

A Macrophage Reporter Cell Assay to Examine Toll-Like Receptor-Mediated NF-kB/AP-1 Signaling on Adsorbed Protein Layers on Polymeric Surfaces07:55

A Macrophage Reporter Cell Assay to Examine Toll-Like Receptor-Mediated NF-kB/AP-1 Signaling on Adsorbed Protein Layers on Polymeric Surfaces

Published on: January 7, 2020

Related Concept Videos

MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a rapamycin-insensitive companion...
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...
Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...