The Psychoactive Agent Crocin Can Regulate Hypothalamic-Pituitary-Adrenal Axis Activity

Post-traumatic stress disorder (PTSD) occurs following life-threatening events. The activity of the hypothalamic-pituitary-adrenal (HPA) axis, which serves as the first line of defense against stress, is dysfunctional in this disorder. The current study aimed to investigate the role of Crocin in normalizing HPA function in an animal model of PTSD induced by electric foot shock. Rats were treated with Crocin 5 min prior to stress induction. The stimulus was re-introduced after 21 days, and we measured individual behaviors such as sniffing, rearing, grooming, and freezing. Enzyme-linked immunosorbent assays were performed to measure plasma levels of Corticosterone. On day 28, after rats were weighed and sacrificed, the adrenal and thymus glands were removed and subjected to real-time polymerase chain reaction to quantify the gene expression of corticotrophin-releasing hormone (CRH), glucocorticoid receptor (GluR), and arginine vasopressin (AVP). Our results demonstrate that rats re-exposed to a stressor developed characteristic symptoms of PTSD, but these were attenuated by Crocin. Treated rats showed significant changes in CRH expression in the hypothalamus, GluR expression in the pituitary, plasma Corticosterone levels, and freezing behavior. Together, these findings suggest that Crocin can regulate HPA axis activity in PTSD. It may serve an appropriate treatment for subjects who experience a traumatic event

Bulge Cells of Rat Hair Follicles: Isolation, Cultivation, Morphological and Biological Features

Objective: Transplants of multipotent stem cells have been shown to have a neuroprotectiveeffect after central nervous system injury. The bulge region of the hair follicle hasbeen reported as a putative source of hair follicle stem cells (HFSC) for many years;however, few studies have documented the properties of bulge derived cells in vitro untilnow. This study was conducted to isolate and culture bulge cells from rat hair folliclesand to determine the morphological and biological features of the cultured cells.Materials and Methods: The bulge region of the rat whisker was isolated and culturedin Dulbecco's modified eagle medium: nutrient mixture F-12 (DMEM/F12) supplementedwith epidermal growth factor (EGF), cholera toxin. Dissociated bulge stemcells were differentiated on coated substrates together with NT-3. The morphologicaland biological features of cultured bulge cells were observed by light microscopy andimmunocytochemistry methods.Results: Our results showed that newly proliferated cells could be observed on the 4thday after explantation. The expression of a neural progenitor marker, nestin, was seenbefore differentiation of the bulge cells. The differentiated cells expressed βIII-Tubulinand RIP, which are the markers of neural and glial lineages.Conclusion: The results indicated that the bulge cells cultured from the rat hair folliclehad the characteristics of stem cells and could differentiate into neural and glial lineages