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The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response relationships...
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Biphasic dose response in low level light therapy - an update.

Ying-Ying Huang1, Sulbha K Sharma, James Carroll

  • 1Wellman Center for Photomedicine, Massachusetts General Hospital; Department of Dermatology, Harvard Medical School, Boston MA; and Aesthetic and Plastic Center of Guangxi Medical University, China.

Dose-Response : a Publication of International Hormesis Society
|March 31, 2012
PubMed
Summary

Low-level laser therapy (LLLT) exhibits a biphasic dose-response, meaning effectiveness varies with dosage. Optimizing LLLT treatments requires understanding this complex relationship for better clinical outcomes.

Keywords:
biphasic dose responselow level laser therapynitric oxidephotobiomodulationreactive oxygen speciestraumatic brain injury

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Area of Science:

  • Photomedicine
  • Biophysics
  • Neuroscience

Background:

  • Low-level laser therapy (LLLT) has been studied since 1967 but remains controversial.
  • Incomplete understanding of mechanisms and inappropriate dosimetry contribute to inconsistent study results.

Purpose of the Study:

  • To review and update the understanding of biphasic dose-response in LLLT.
  • To explore the role of mediators like ATP and reactive oxygen species (ROS) in LLLT effects.
  • To examine transcranial LLLT for traumatic brain injury (TBI) in mice.

Main Methods:

  • Review of in vitro and animal studies on LLLT dose-response.
  • Analysis of mediator responses (ATP, mitochondrial membrane potential, ROS) to LLLT.
  • Examination of transcranial LLLT effects on TBI in mice.

Main Results:

  • In vitro mediators like ATP and mitochondrial membrane potential show biphasic patterns.
  • Mitochondrial reactive oxygen species (ROS) exhibit a triphasic dose-response with two peaks.
  • Transcranial LLLT for TBI in mice demonstrated a biphasic pattern in neurological effects.

Conclusions:

  • The biphasic dose-response (Arndt-Schulz curve) is a key characteristic of LLLT.
  • The dual role of ROS (signaling vs. cytotoxic) may explain varied LLLT outcomes.
  • Further research into biphasic dose responses is crucial for optimizing clinical LLLT treatments.