After all, complete knowledge about both sides of a coin definitely tells us much more about the coin. == Acknowledgements == We thank Gunjan Guha, School of Chemical and Biotechnology, SASTRA University, Thanjavur, India, intended for the preparation ofFigure 2 . == Conflicts of Regorafenib Hydrochloride interest == The authors declare they have no conflict of interest. == References ==. 2-Kelch-like ECH-associated protein 1 (Nrf2-Keap1), sirtuin-forkhead box O (SIRT-FOXO) and others), analyzing how diverse molecules associated with these pathways conform to hormesis. Keywords: hormesis, biphasic, cancer, pathways, stressor, mimetics == 1 . Introduction == For several decades, it was believed that drug dosage follows a linear pattern, generating enormous ignorance in the knowledge of the responses in the low-dose zone [1]. Nonetheless, in the past few years, several studies possess depicted an inverse response to varied drug doses in the same individual, thereby thoroughly discarding the linearity and threshold-response models of dose dedication [2, 3]. This reaction, known as biphasic dose response, because revealed by several studies, has shown significance in establishing the modality of a drug [4, 5, 6, 7]. This phenomenon determines the optimal dose of a prescribed drug and, thus, very well advocates Philip von Hohenheims adage Pass away Dosis macht das Present or the dose makes the poison [8]. It is well recorded that mild environmental stress due to feeble doses of stressor stimuli often incites adaptive stress response in individuals in order to maintain homeostasis [9, 10]. It also complies with the fact that while higher doses of an insult can be overtly harmful, small doses of the same can actually promote wellness, governed by growth and AGIF development [4, 11]. For instance, everybody knows that oxygen is indispensable for all aerobic life forms. However , it is interesting to note that the same elixir at high concentrations can prove to be toxic, thus establishing that oxygen follows a biphasic dose relationship [12]. Hence, oxygen is considered beneficial at environmental doses and fatal at higher concentrations [13, 14]. Such a biphasic response brings Regorafenib Hydrochloride into light an immensely significant concept called hormesis, which refers to a phenomenon that is designated by a low-dose activation and high-dose inhibition [3]. Quite simply, hormesis is defined as the duality in response by a cell/individual in reply to an impetus (may be endogenous or exogenous) that spurs favorable effects at a low dose and harmful effects at higher measures [15] (Figure 1). Therefore , in contrast to threshold or linear models of dose-response, hormesis is Regorafenib Hydrochloride usually represented either by an inverted U- (bell-shaped) or a J-/U-shaped dose-response curve. == Physique 1 . == Hormetic effect of essential oil obtained fromThymus vulgariscell viability (taken and modified with permission of the International Institute of Anticancer Study, Greece). Human being UMSCC1 squamous cell carcinoma cells were treated with and without essential oil of Thymus vulgaris and subjected to transcriptome-wide microarray analyses. A total number of 804 genes were differentially regulated in treated cells compared to untreated control cells. These were subjected to ingenuity pathway analysis (IPA) profiling to identify possible pathways. The top three pathways that contribute to the mode of action of the essential oil were: (1) interferon signaling, (2)N-glycan biosynthesis and (3) ERK5 signaling [16]. Hormesis, generally, might also be elaborated because an adaptive mechanism of a cell or an organism to compensate any imbalance in homeostasis caused by exposure to factors that mediate intermittent moderate stresses [10, 16, 17]. For example , small episodes of moderate ischemia known as ischemic preconditioning (IPC) have been reported to shield the brain from long term severe depletion of blood and, thus, oxygen [10]. In another adaptive biphasic response, moderate caloric restriction (CR) in diverse animals was discovered to be associated with protection against diverse forms of cancer [18, 19, 20]. While extreme dietary (calorie) restriction could manifest into malnutrition, moderate restriction, on the contrary, evokes an adaptive response that defends an individual from cancer and other progressive degenerative pathologies, such as neuro-degenerative and geriatric diseases [21]. This also takes us.