Exogenous application of melatonin alleviates salt stress-induced decline in growth and photosynthesis Glycine max (L.) seedlings by improving mineral uptake, antioxidant glyoxalase system | Basmah M. Alharbi, Abeer Hamdy Elhakem, Ghalia S. H. Alnusairi, Mona Soliman, Khalid Rehman Hakeem, Md. Mahadi Hasan, Magdi T Abdelhamid Agricultural Journals

Melatonin was found in the fresh water characeae Chara australis. The concentrations (~4 μg/g of tissue) were similar in photosynthesizing cells, independent of their position on the plant and rhizoids (roots) without chloroplasts. Exogenous melatonin, added at 10 μM to the artificial pond water, increased quantum yield of photochemistry of photosystem II by 34%. The increased efficiency appear...

Melatonin has been reported to induce effective reduction in growth and development a variety of tumors, including breast cancer. In triple-negative cancer (TNBC) cells, melatonin attenuates features, such as tumor apoptosis resistance, through number still poorly characterized mechanisms. One biological process that is important for TNBC cells store-operated Ca2+ entry (SOCE), which...

Background. Sleep disturbances and cognitive dysfunction are common in patients with breast cancer. Disturbed sleep leads to poor cognitive performance and exogenous melatonin may improve sleep and attenuate cognitive dysfunction. We hypothesized that melatonin would improve sleep and cognitive function after surgery. Methods. This study reports secondary endpoints from a randomized, double-bli...

The human skin is not only a target for the protective actions of melatonin, but also a site of melatonin synthesis and metabolism, suggesting an important role for a local melatoninergic system in protection against ultraviolet radiation (UVR) induced damages. While melatonin exerts many effects on cell physiology and tissue homeostasis via membrane bound melatonin receptors, the strong protec...

Melatonin is a ubiquitous signal molecule, playing crucial roles in plant growth and stress tolerance. Recently, toxic metal cadmium (Cd) has been reported to regulate melatonin content in rice; however, the function of melatonin under Cd stress, particularly in higher plants, still remains elusive. Here, we show that optimal dose of melatonin could effectively ameliorate Cd-induced phytotoxici...

Aoki, Ken, Dan P. Stephens, Kun Zhao, Wojciech A. Kosiba, and John M. Johnson. Modification of cutaneous vasodilator response to heat stress by daytime exogenous melatonin administration. Am J Physiol Regul Integr Comp Physiol 291: R619–R624, 2006. First published May 11, 2006; doi:10.1152/ajpregu.00117.2006.—In humans, the nocturnal fall in internal temperature is associated with increased end...

To investigate the role of endogenous opioid peptides (EOP) in the inhibitory control of LH secretion in the ram, the acute effects of naloxone (opioid antagonist) on episodic LH secretion were measured in rams at different stages of a reproductive cycle induced by treatment with melatonin. Groups of SCGx rams (functionally pinealectomized) and pineal intact rams were housed under long days (16...

Melatonin (N-acetyl-5-methoxytryptamine) is an animal hormone synthesized predominantly at night. It often serves as a signal of darkness that regulates circadian rhythmicity and photoperiodism. Melatonin has also been found in algae and higher plants, including the short-day flowering plant Chenopodium rubrum. To test its involvement in plant photoperiodism, melatonin solutions were applied to...

Circadian rhythm sleep disorders (CRSDs), whether chronic or transient, affect a broad range of individuals, including many elderly, those with severe visual impairments, shift workers, and jet travelers moving rapidly across many time zones. In addition, various forms of insomnia affect another large sector of the population. A feature common among CRSDs and some forms of insomnia is sensitivi...