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A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
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Hyperthermia occurs when the body's temperature becomes unusually high, often due to heat exposure, intense physical activity, or certain illnesses. This condition can create a dangerous cycle where elevated body temperature increases the metabolic rate, generating more heat and potentially leading to organ failure and brain damage. A severe form of hyperthermia, called heat stroke, can raise body temperature to life-threatening levels. Fever, on the other hand, is a controlled form of...
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Hyperthermic triggers for drug delivery platforms.

Lilian C Alarcón-Segovia1,2, Maria R Morel3, Jorge I Daza-Agudelo3

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Superparamagnetic nanoparticles in soft tissue models generate localized heat when exposed to electromagnetic fields, enabling controlled drug release. This method shows significant hyperthermia and drug release, dependent on nanoparticle concentration and field parameters.

Keywords:
biomaterialsmagnetic fieldmicrowaves

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Biophysics

Background:

  • Electromagnetic fields interact with aqueous media without physical contact.
  • Superparamagnetic biomaterials absorb electromagnetic energy, generating localized heat.
  • Controlled drug release is crucial for targeted therapies.

Purpose of the Study:

  • To explore hyperthermic effects of electromagnetic fields on superparamagnetic nanoparticles for controlled drug release.
  • To investigate the use of these effects in soft tissue simulating materials.
  • To analyze the influence of nanoparticle concentration and electromagnetic field parameters on hyperthermia and drug release.

Main Methods:

  • Preparation of gelatin-based soft tissue simulating materials doped with superparamagnetic nanoparticles.
  • Irradiation of materials with externally applied electromagnetic fields.
  • Measurement of temperature changes and drug diffusion (model drug in water and phosphate buffer).

Main Results:

  • Significant hyperthermic effects observed, increasing temperature from 35°C to 45°C at 2.5°C min⁻¹.
  • Up to 89% release of an entrapped model drug was achieved.
  • Hyperthermia intensity strongly correlated with nanoparticle concentration, electromagnetic field power, and pulse frequency.

Conclusions:

  • Externally applied electromagnetic fields can effectively trigger hyperthermia in superparamagnetic nanoparticle-doped materials.
  • This hyperthermia facilitates controlled drug release from soft tissue simulating materials.
  • The developed method offers a promising approach for localized, non-invasive therapeutic interventions.