Volume 4 • Issue 3 • 1000e139 Biochem Physiol ISSN: 2168-9652 BCP, an open access journal Editorial Open Access Biochemistry & Physiology: Open Access Rashid et al., Biochem Physiol 2015, 4:3 http://dx.doi.org/10.4172/2168-9652.1000e139 Keywords: Ghrelin; Growth hormone; Neurotransmitter; Neuroscience Editorial Ghrelin, the hunger hormone is a type of peptide hormone secreted by the ghrelinergic cells located throughout the GIT mostly from stomach & a lesser extent from duodenum. It acts as a neuropeptide in the CNS. Besides regulating appetite it also plays a signiicant role in regulating distribution and rate of use of energy. Ghrelin act as G-protein coupled receptor (GPCR) named Growth hormone secretagogue receptor (GHSR) or ghrelin receptor. It has 28 amino acids and containing an n-octanoyl group in the serine residue at position 3 [1-6]. It is reported that ghrelin is performed its action into various types of tissues such as duodenum, jejunum, ileum, colon, lung, heart, pancreas, kidney, testis, pituitary, and hypothalamus in the body system, moreover in the CNS system it expressed at low level [7-9]. Recent indings revealed that administration of ghrelin to rats induces food intake and reduction of energy expenses [10-14]. he major physiological and biological function of ghrelin includes growth hormone secretion, stimulation of food intake, gastric acid secretion, regulation of motility and the regulation of the endocrine and exocrine pancreatic secretions. Ater crossing the blood-brain barrier ghrelin reaches in brainstem [17], and transmits its signal through the vagal nerve [18]. In hypothalamus, it activates the arcuate nucleus (ARC), paraventricular nucleus (PVN), dorsomedial region, central nucleus of amygdala, and the nucleus of solitary tract [19-20]. By stimulating the activity of NPY/AGRP neurons and decreasing the activity of POMC and CART neurons, ghrelin increases appetite and food intake [21-23]. AMPK is regulates the fuel availability by stimulating ATP producing pathways and inhibiting ATP consuming pathways [24]. Ater ATP depletion, AMP rises and induces the activation of AMPK by phosphorylation [25]. Activated AMPK then induces the phosphorylation of acetyl-CoA carboxylase (ACC), which leading to the inhibition of ACC activity and the decrease in malonyl-CoA levels and inally resulting in increased fatty acid oxidation via the activation of carnitine-palmitoyl transferase 1 (CPT1) [26-27] (Figure 1). *Corresponding author: M Salahuddin, Faculty of Medicine, University of Hongkong, Pokfulam Road, Hongkong, Tel: +852-5584-1096; E-mail: ssdin23@gmail.com Received July 25, 2015; Accepted July 25, 2015; Published August 01, 2015 Citation: Rashid M, Islam MS, Salahuddin M, Sayfullah M, Hossain D, et al. (2015) The Biochemistry of Hunger Stimulating Hormone: Why Understanding This Cascade In Hypothalamus Is Beneicial. Biochem Physiol 4: e139. doi: 10.4172/2168-9652.1000e139 Copyright: © 2015 Rashid M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The Biochemistry of Hunger Stimulating Hormone: Why Understanding This Cascade In Hypothalamus Is Beneficial Mahjabin Rashid 1 , Md. Shariful Islam 2 , M Salahuddin 3 *, Md. Sayfullah 4 , Deluwer Hossain 5 , MA Momin 6 , M. Abu Sayed 7 , Jay Prakash Sah 8 and Sanjay Kumar Shah 9 1 College of Medicine, Mymensingh Medical College and Hospital, Mymensingh, University of Dhaka, Bangladesh 2 Department of Biotechnology and Genetic Engineering, Faculty of Life Science, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh 3 Faculty of Medicine, University of Hongkong, Pokfulam Road, Hongkong 4 College of Medicine, Shaheed Ziaur Rahman Medical College Hospital, Bogra, University of Rajshahi, Bangladesh 5 Department of Pharmacology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh 6 Department of Microbiology and Hygiene, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh 7 Department of Biochemistry and Molecular Biology, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh 8 Department of Medical Laboratory Science, School of Health and Allied Sciences, Pokhara University, Lekhnath -12 Kaski, Nepal 9 Department of Medical Laboratory Science, Asian College for Advance Study, Satodobato, Lalitpur, Nepal Abstract Ghrelin is the key hormone responsible for our hunger stimulate to food intake in body system. At present a huge number of people suffer from obesity, so understanding the mechanisms by which various hormones and neurotransmitters have inluence on energy balance has been a subject of current research in neuroscience. At present ghrelin is the only known gastrointestinal hormone that increases food intake where Plasma ghrelin levels are inversely correlated with body weight and rise following weight loss in humans. It is a natural ligand of the growth hormone (GH) secretagogue (GHS) receptor type 1a (GHS-R1a). The GHS-R is highly expressed in the hypothalamus, but is also found in the brainstem, pituitary, GI tract, adipose tissue and other peripheral tissues. Ghrelin is still recognized as a potential drug target for weight regulation. The main objective of this is to summarize the current knowledge and optimize about the physiology and pathophysiology of ghrelin in food intake regulation. Figure 1: Pathways involved in ghrelin induction of food intake in hypothalamus. In this igure Arrows and lines indicate stimulation and inhibition [15,16].