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J Cell Physiol. 2019 Jul;234(7):10060-10071. doi: 10.1002/jcp.27880. Epub 2018 Dec 4.

Hormetic effects of curcumin: What is the evidence?

Author information

1
Department of Nutrition, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
2
Department of Clinical Nutrition and Dietetics, Faculty of Nutrition and Food Technology, National Nutrition and Food Technology Research Institute, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
3
Diabetes Research Center, Qatar Biomedical Research Institute, Doha, Qatar.
4
CNRS FR3636 Institut de Neurosciences "Mitochondria, Apoptosis and Autophagy Signalling," Université Paris-Descartes, Paris, France.
5
Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá D.C., Colombia.
6
Instituto de Ciencias Biomédicas, Universidad Autónoma de Chile, Santiago, Chile.
7
Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
8
Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
9
School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.

Abstract

Curcumin (diferuloylmethane), a component of the yellow powder prepared from the roots of Curcuma longa or Zingiberaceae (known as turmeric) is not only widely used to color and flavor food but also used as a pharmaceutical agent. Curcumin demonstrates anti-inflammatory, anticarcinogenic, antiaging, and antioxidant activity, as well as efficacy in wound healing. Notably, curcumin is a hormetic agent (hormetin), as it is stimulatory at low doses and inhibitory at high doses. Hormesis by curcumin could be also a particular function at low doses (i.e., antioxidant behavior) and another function at high dose (i.e., induction of autophagy and cell death). Recent findings suggest that curcumin exhibits biphasic dose-responses on cells, with low doses having stronger effects than high doses; examples being activation of the mitogen-activated protein kinase signaling pathway or antioxidant activity. This indicates that many effects induced by curcumin are dependent on dose and some effects might be greater at lower doses, indicative of a hormetic response. Despite the consistent occurrence of hormetic responses of curcumin in a wide range of biomedical models, epidemiological and clinical trials are needed to assess the nature of curcumin's dose-response in humans. Fortunately, more than one hundred clinical trials with curcumin and curcumin derivatives are ongoing. In this review, we provide the first comprehensive analysis supportive of the hormetic behavior of curcumin and curcumin derivatives.

KEYWORDS:

biphasic effect; curcumin; hormesis; hormetic response

PMID:
30515809
DOI:
10.1002/jcp.27880

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