Related Experiment Video

Updated: Feb 11, 2026

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation
09:37

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation

Published on: March 15, 2018

14.5K

Role of Muramyl Dipeptide in Lipopolysaccharide-Mediated Biological Activity and Osteoclast Activity

Hideki Kitaura1, Masahiko Ishida1, Keisuke Kimura1

  • 1Division of Orthodontics and Dentofacial Orthopedics, Department of Translational Medicine, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.

Analytical Cellular Pathology (Amsterdam)
|April 19, 2018
PubMed

Insights

Muramyl dipeptide (MDP) amplifies lipopolysaccharide (LPS)-induced inflammation and bone resorption. MDP enhances LPS effects on cytokine production, shock, and osteoclastogenesis, highlighting its critical role in LPS-mediated biological activities.

Area of Science:

  • Immunology
  • Microbiology
  • Cell Biology

Background:

  • Lipopolysaccharide (LPS) is a bacterial endotoxin that triggers inflammation and immune responses.
  • Muramyl dipeptide (MDP) is a key component of peptidoglycans, also inducing inflammation.
  • Synergistic interactions between LPS and MDP amplify inflammatory and immunological activities.

Purpose of the Study:

  • To review the role of MDP in LPS-mediated biological activities.
  • To focus on MDP's influence on LPS-induced osteoclastogenesis.
  • To elucidate the mechanisms by which MDP enhances LPS effects.

Main Methods:

  • Literature review of studies investigating LPS and MDP interactions.
  • Analysis of data on cytokine production, shock induction, and bone resorption.
  • Examination of molecular signaling pathways including TLR4, RANKL, and MAPK.

Main Results:

  • MDP synergistically enhances LPS-induced proinflammatory cytokine production.
  • MDP exacerbates LPS-induced lethal shock in mice.
  • MDP potentiates LPS-driven osteoclast formation, bone resorption, RANKL, TLR4 expression, and MAPK signaling.

Conclusions:

  • MDP significantly enhances various LPS-mediated biological activities.
  • MDP plays a crucial role in LPS-induced osteoclastogenesis and bone pathology.
  • Understanding MDP-LPS interactions is vital for targeting inflammatory and bone diseases.

More Related Videos

Measurement of Chitinase Activity in Biological Samples03:32

Measurement of Chitinase Activity in Biological Samples

Published on: August 22, 2019

10.9K
Stimulation of Notch Signaling in Mouse Osteoclast Precursors08:01

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Published on: February 28, 2017

8.4K

Related Concept Videos

Activation Energy01:26

Activation Energy

Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate of the reaction. However, adding heat to the reaction will increase the rate, since it causes molecules to move faster and increase the likelihood that molecules will collide. The collision and breaking of bonds represents the uphill phase of a reaction and generates the transition state. The transition state is an unstable high-energy state...
87.1K
Eukaryotic Transcription Activators02:42

Eukaryotic Transcription Activators

Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
The binding domains are capable of recognizing and interacting with regulatory sequences on the DNA. These...
12.9K
Role of Water in Human Biology01:27

Role of Water in Human Biology

Water is the one of the most significant components of the human body; it plays a crucial role in several physiological activities because of its unique physicochemical properties. Importantly, it helps to regulate body temperature and is the chief component of several body fluids.
Water's Solvent Properties
Since water is a polar molecule with slightly positive and slightly negative charges, ions and polar molecules can readily dissolve in it. Therefore, it is referred to as a solvent, a...
14.3K
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
8.7K
tRNA Activation02:26

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
23.1K
Secondary Active Transport01:55

Secondary Active Transport

One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
138.2K