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Related Concept Videos

Increased Body Temperature01:25

Increased Body Temperature

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 response to an infection or illness.
Drug toxicity: Drug–Drug Interaction01:30

Drug toxicity: Drug–Drug Interaction

Drug–drug interactions can precipitate toxicity through multiple mechanisms. Absorption interactions alter how drugs enter the body, exemplified when ranitidine increases the absorption of basic drugs, while cholestyramine decreases the levels of propranolol. Protein binding interactions occur when drugs share the same binding sites on plasma proteins. Drugs like aspirin and warfarin, when bound in excess, can lead to increased free drug concentrations, enhancing the potential for...
Homeostatic Imbalances in Body Temperature01:19

Homeostatic Imbalances in Body Temperature

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...
Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
Pharmacokinetics: Drug–Drug Interactions01:25

Pharmacokinetics: Drug–Drug Interactions

Drug interactions occur when the pharmacological effect of one drug is altered by another substance, either enhancing or diminishing its activity. The drug whose activity is altered is known as the object drug, and the substance causing the alteration is called the agent drug or the precipitant. The net effects of these interactions are mostly undesirable, leading to decreased effectiveness or increased adverse effects. In rare cases, interactions can be beneficial, such as the enhanced...

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A Computational Modeling Approach to Investigate the Influence of Hyperthermia on the Tumor Microenvironment
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A Computational Modeling Approach to Investigate the Influence of Hyperthermia on the Tumor Microenvironment

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Interactions between hyperthermia and cytotoxic drugs.

B Hildebrandt1, P Wust

  • 1Charité-Centrum Tumormedizin, Charité Universitätsmedizin Berlin, Germany. hyperthermia@charite.de

Cancer Treatment and Research
|July 18, 2007
PubMed
Summary

Hyperthermia (heat application) can kill cancer cells above 43°C and sensitize tumors to radiation and chemotherapy between 39°C and 43°C. This chapter explores heat-drug interactions and their effects on cancer treatment.

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Area of Science:

  • Oncology
  • Biophysics
  • Pharmacology

Background:

  • Early research in the 1970s-1980s established hyperthermia's effects on cell death and drug sensitization.
  • Subsequent studies have elucidated complex heat-drug interactions within living organisms.

Purpose of the Study:

  • To review the fundamental principles of heat-drug interactions in cancer therapy.
  • To examine how these interactions vary across different cytotoxic drug classes.
  • To discuss drug resistance modulation and pharmacological considerations during hyperthermia treatment.

Main Methods:

  • Review of foundational studies on hyperthermia and its effects on cellular responses.
  • Analysis of research detailing the synergistic effects of heat and chemotherapy.
  • Examination of pharmacological data concerning drug delivery and resistance under hyperthermia.

Main Results:

  • Hyperthermia induces cell death at temperatures exceeding 43°C.
  • Tumor cells become more sensitive to radiation and certain cytotoxic drugs within the 39°C-43°C range.
  • Heat can modulate drug resistance, with effects varying by drug class.

Conclusions:

  • Understanding heat-drug interactions is crucial for optimizing cancer treatment protocols.
  • Hyperthermia offers a versatile approach to enhance the efficacy of conventional therapies.
  • Further research into pharmacological aspects can improve patient outcomes in combined treatments.