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Related Concept Videos

Decreasing Function01:27

Decreasing Function

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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Assembly and Characterization of Polyelectrolyte Complex Micelles
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High Concentrations of Polyelectrolyte Complex Nanoparticles Decrease Activity of Osteoclasts.

Vivien Kauschke1,2, Felix Maximilian Hessland3, David Vehlow4

  • 1Experimental Trauma Surgery, Justus-Liebig-University Giessen, Aulweg 128, 35392 Giessen, Germany. Vivien.Kauschke@chiru.med.uni-giessen.de.

Molecules (Basel, Switzerland)
|June 28, 2019
PubMed
Summary

High concentrations of polyelectrolyte complex nanoparticles (PEC-NPs) reduced osteoclast activity, offering a potential treatment for osteoporosis. Brain-Derived Neurotrophic Factor (BDNF) did not impact osteoclasts, suggesting it may be safe for fracture treatment.

Keywords:
BDNFcalcitonin receptorcathepsin Kdrug delivery systemosteoclastspit formationpolyelectrolyte complex nanoparticlestartrate-resistant acidic phosphatase 5b

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Area of Science:

  • Biomaterials Science
  • Orthopedics
  • Cell Biology

Background:

  • Osteoporosis treatment remains challenging due to imbalanced bone formation and resorption.
  • Effective therapies require materials that promote bone formation and reduce resorption.
  • Nanoparticles offer potential for targeted drug delivery in bone regeneration.

Purpose of the Study:

  • To investigate the effects of polyelectrolyte complex nanoparticles (PEC-NPs) on osteoclasts in vitro.
  • To evaluate the potential of PEC-NPs as a therapeutic agent for osteoporotic fractures.
  • To assess the role of Brain-Derived Neurotrophic Factor (BDNF) in conjunction with PEC-NPs.

Main Methods:

  • In vitro analysis of osteoclast activity using live cell imaging.
  • Real-time RT-PCR to measure gene expression (cathepsin K, calcitonin receptor).
  • Enzyme-Linked Immunosorbent Assay (ELISA) for tartrate-resistant acidic phosphatase 5b (TRAP 5b) activity.
  • Pit formation assays to assess hydroxyapatite resorption.

Main Results:

  • High concentrations of PLL/CS PEC-NPs significantly decreased osteoclast numbers and activity.
  • Reduced mRNA expression of cathepsin K and calcitonin receptor in osteoclasts.
  • Lowered TRAP 5b activity and hydroxyapatite resorption by osteoclasts.
  • BDNF showed no significant influence on osteoclastogenesis or activity.

Conclusions:

  • Highly concentrated PLL/CS PEC-NPs effectively decrease osteoclastogenesis and activity.
  • BDNF appears safe for potential use in osteoporotic fracture treatment as it doesn't enhance osteoclast activity.
  • PEC-NPs show promise as a therapeutic strategy for managing osteoporotic bone loss and fractures.