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Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
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Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
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The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
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Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...
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The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
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Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
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Related Experiment Video

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A Semi-Quantitative Drug Affinity Responsive Target Stability DARTS assay for studying Rapamycin/mTOR interaction
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Rapamycin: one drug, many effects.

Jing Li1, Sang Gyun Kim1, John Blenis1

  • 1Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.

Cell Metabolism
|February 11, 2014
PubMed
Summary

The mammalian target of rapamycin (mTOR) pathway regulates cell growth. Rapamycin, an mTOR inhibitor, shows promise for treating diseases like cancer, but combination therapies may offer greater utility.

Area of Science:

  • Molecular Biology
  • Cellular Metabolism
  • Pharmacology

Background:

  • The mammalian target of rapamycin (mTOR) signaling pathway is crucial for regulating cell growth and metabolism.
  • Aberrant mTOR pathway activity is linked to various human diseases, including cancer, diabetes, obesity, and neurological disorders.

Purpose of the Study:

  • To discuss the mechanism of action of rapamycin, a specific mTOR inhibitor.
  • To review recent findings on the efficacy and limitations of rapamycin monotherapy.
  • To explore the potential of combination therapy involving rapamycin.

Main Methods:

  • Literature review of studies on mTOR signaling.
  • Analysis of rapamycin's mechanism of action.
  • Evaluation of clinical and preclinical data on rapamycin therapy.

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Main Results:

  • Rapamycin effectively inhibits the mTOR pathway.
  • Monotherapy with rapamycin has demonstrated therapeutic effects but also limitations.
  • Combination therapies involving rapamycin show potential for enhanced treatment outcomes.

Conclusions:

  • Rapamycin is a key therapeutic agent targeting the mTOR pathway.
  • Understanding rapamycin's effects and limitations is crucial for optimizing its use.
  • Combination strategies hold promise for overcoming challenges in rapamycin-based treatments.