Immunomodulatory and therapeutic properties of the Nigella sativa L. seed

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Thymoquinone: Potential cure for inflammatory disorders and cancer

Thymoquinone: a promising anti-cancer drug from natural sources.

p-Coumaric acid (4-hydroxycinnamic acid) is a phenolic acid that has low toxicity in mice (LD50 = 2850 mg kg(-1) body weight), serves as a precursor of other phenolic compounds, and exists either in free or conjugated form in plants. Conjugates of p-coumaric acid have been extensively studied in recent years due to their bioactivities. In this review, the occurrence, bioavailability and bioaccessibility of p-coumaric acid and its conjugates with mono-, oligo- and polysaccharides, alkyl alcohols, organic acids, amine and lignin are discussed. Their biological activities, including antioxidant, anti-cancer, antimicrobial, antivirus, anti-inflammatory, antiplatelet aggregation, anxiolytic, antipyretic, analgesic, and anti-arthritis activities, and their mitigatory effects against diabetes, obesity, hyperlipaemia and gout are compared. Cumulative evidence from multiple studies indicates that conjugation of p-coumaric acid greatly strengthens its biological activities; however, the high biological activity but low absorption of its conjugates remains a puzzle. © 2015 Society of Chemical Industry.

p‐Coumaric acid and its conjugates: dietary sources, pharmacokinetic properties and biological activities

Thymoquinone and its therapeutic potentials.

The antioxidant and pro-oxidant effects of thymoquinone (TQ), a natural main constituent of the volatile oil of Nigella saliva seeds, and a synthetic structurally-related tert-butylhydroquinone (TBHQ), were examined in vitro. Both TQ and TBHQ efficiently inhibited iron-dependent microsomal lipid peroxidation in a concentration-dependent manner with median inhibitory concentration (IC50) values of 16.8 and 14.9 microM, respectively. TBHQ was stronger than TQ as a scavenger of 2,2'-diphenyl-p-picrylhydrazyl radical (DPPH) (IC50 = 5 microM, 200 times more active than TQ) and as a scavenger of hydroxyl radical (OH*) with an IC50 of 4.6 microM (approximately 10 times more active than TQ). TQ was more active than TBHQ as a superoxide anion scavenger with IC50 of 3.35 microM compared to 18.1 microM for TBHQ. Only TBHQ significantly promoted DNA damage in the bleomycin-Fe(III) system. The results suggest that both TQ and TBHQ have strong antioxidant potentials through scavenging ability of different free radicals. Moreover, the data indicate that TQ is acting mainly as a potent superoxide anion scavenger.

Thymoquinone is a potent superoxide anion scavenger

Three novel series of 2-(substituted phenyl)-4-(substituted arylidene)-imidazolone-5-(4H)-ones were derived from the corresponding oxazolones by condensation with different arylamines. Eleven of the synthesized compounds were selected and evaluated for their effect on carrageenan-induced rat paw edema. Compound 4b had the same efficacy as the reference standard (indomethacin), and compounds 3b, 3c, 4a, 4d and 9a showed good to excellent activities, with other compounds only weakly active. The potent compounds were evaluated for their inhibitory activities against COX-2-catalyzed PGE(2) production, with 4a, 4b and 3c showing strong inhibitory activity.

Synthesis and biological evaluation of novel imidazolone derivatives as potential COX-2 inhibitors

The effects of three natural phenolic acids (caffeic, ferulic, and p-coumaric) on the rat thyroid gland were examined in a 3-week oral-treatment study. Forty male Wistar albino rats, divided into groups of 10 rats each and fed iodine-rich diet, were administered by gastrointestinal tube saline (control), caffeic acid, ferulic acid, or p-coumaric acid at a dose level of 0.25 micromol/kg/day for 3 weeks. The mean absolute and relative thyroid weights in caffeic, ferulic, or p-coumaric acid groups were significantly increased to 127 and 132%, 146 and 153%, or 189 and 201% compared to control value, respectively. Histological examination of the thyroids of p-coumaric acid group revealed marked hypertrophy and/or hyperplasia of the follicles. Caffeic or ferulic groups showed slight to moderate thyroid gland enlargement. Thyroid lesions in p-coumaric acid group were associated with significant increases in cellular proliferation as indicated by [(3)H]thymidine incorporation. In addition, the goitrogenic effect of p-coumaric acid was further confirmed by significant decreases (50%) in serum tri-iodothyronine (T(3)) and thyroxine (T(4)), and a parallel increase (90%) in serum thyroid stimulating hormone (TSH) compared to control group. These results indicate that administration of p-coumaric acid at relatively high doses induces goiter in rats.

Goitrogenic activity of p-coumaric acid in rats.

Doxorubicin (DOX) so far continues to be one of the most potent and effective anticancer drugs. Therefore, it is still needed to search for a safe and effective therapy that can opposite DOX-induced cardiotoxicity. Irbesartan (IRB), an angiotensin II receptor blocker, has a wide-ranging variety of biological activities. The present study was designed to explore the possible protective effects of IRB against DOX-induced cardiotoxicity and the underlying mechanisms. Rats were divided into four groups: control, IRB (40 mg/kg, orally/daily) for 3 weeks, DOX (2.5 mg/kg, intraperitoneally/ three times weekly) for 2 weeks to obtain cumulative dose of 15 mg/kg, and finally IRB + DOX group. IRB inhibited cardiotoxicity induced by DOX which was evident by ECG changes, alterations of cardiac enzymes and histopathological changes. IRB improved DOX-induced alterations in oxidative/nitrosative status by decreasing lipid peroxidation and nitric oxide (NO) content in addition to increasing the antioxidant capacity. In addition, DOX triggers the cardiac expression of tumor necrosis factor-α (TNF-α) and nuclear factor kappa B (NF-κB) where IRB diminished DOX-induced alterations in theses parameters. Moreover, DOX significantly increase the expression levels of caspase-3 and transforming growth factor-beta 1 (TGF-β1), while IRB exhibited anti-apoptotic and anti-fibrotic effects where it abolished these elevations. Meanwhile, DOX-induced activation of p38-mitogen activated protein kinase (p38-MAPK) which was inhibited by IRB. Collectively, these results proposed that IRB afforded a significant protection against DOX-induced cardiac damage by means of antioxidant, anti-inflammatory, anti-apoptotic, and anti-fibrotic remodeling mechanisms. These mechanisms are possibly mediated, at least in part, by alterations of TGF-β1/p38-MAPK/NF-κB signaling.

Ragia A. Taha

Papers

Thymoquinone is a potent superoxide anion scavenger

Synthesis and biological evaluation of novel imidazolone derivatives as potential COX-2 inhibitors

Goitrogenic activity of p-coumaric acid in rats.

Irbesartan suppresses cardiac toxicity induced by doxorubicin via regulating the p38-MAPK/NF-κB and TGF-β1 pathways

Sildenafil inhibits agonist-evoked rat uterine contractility: influence of guanylyl cyclase inhibition.