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14-September-2008 18:02:48 - Peptide hormone Peptide hormones are a class of peptides that are secreted into the blood stream and have endocrine functions in living animals.1 Like other proteins, peptide hormones are synthesized from amino acids according to an mRNA template, which is itself synthesized from a DNA template inside the cell's nucleus. Peptide hormone precursors pre-prohormones are then processed in several stages, typically in the endoplasmic reticulum, including removal of the N-terminal signal sequence and sometimes glycosylation, resulting in prohormones. The prohormones are then packaged into membrane-bound secretory vesicles, which can be secreted from the cell by exocytosis in response to specific stimuli.2 These prohormones often contain superfluous amino acid residues that were needed to direct folding of the hormone molecule into its active configuration but have no function once the hormone folds. Specific endopeptidases in the cell cleave the prohormone just before it is released into the blood stream, generating the mature hormone form of the molecule. Mature peptide hormones then diffuse through the blood to all of the cells of the body, where they interact with specific receptors on the surface of their target cells. Some peptide/protein hormones angiotensin II, basic fibroblast growth factor-2, parathyroid hormone-related protein also interact with intracellular receptors located in the cytoplasm or nucleus by an intracrine mechanism.3 Notable peptide hormones Several important peptide hormones are secreted from the pituitary gland. The anterior pituitary secretes luteinizing hormone and follicle-stimulating hormone, which act on the gonads, prolactin, which acts on the mammary gland, adrenocorticotrophic hormone ACTH, which acts on the adrenal cortex to regulate the secretion of glucocorticoids, and growth hormone, which acts on bone, muscle, and the liver. The posterior pituitary gland secretes antidiuretic hormone, also called vasopressin, and oxytocin. Peptide hormones are produced by many different organs and tissues, however, including the heart atrial-natriuretic peptide ANP or atrial natriuretic factor ANF and pancreas insulin and somatostatin, the gastrointestinal tract cholecystokinin, gastrin, and adipose tissue stores leptin.45 Some neurotransmitters are secreted and released in a similar fashion to peptide hormones, and some 'neuropeptides' may be used as neurotransmitters in the nervous system in addition to acting as hormones when released into the blood. When a peptide hormone binds to receptors on the surface of the cell, a second messenger appears in the cytoplasm, which triggers intracellular responses.6 References ^ Peptide Hormone Secretion/Peptide Hormone Action: A Practical Approach, K. Siddle, J. C. Hutton, Oxford University Press, 1991, ISBN:0199630739. ^ Peptide Hormone Secretion: A Practical Approach, J. C. Hutton, Oxford University Press, 1991, ISBN:0199630682. ^ The Endocrine System in Sports and Exercise, William J. Kraemer, Alan D. Rogol, Blackwell Publishing, 2005, ISBN:1405130172. ^ Dictionary of Biological Psychology, Philip Winn, Taylor and Francis, 2001, ISBN:0415136067. ^ McGraw-Hill Encyclopedia of Science Technology, Sybil P. Parker, McGraw-Hill, 1997, ISBN:0079115047. ^ The Practice of Medicinal Chemistry, C. G. Wermuth, Academic Press, 2003, ISBN:0127444815. v d e Endocrine system: hormones/endocrine glands Peptide hormones, Steroid hormones Hypothalamic-pituitary Hypothalamus: TRH, CRH , GnRH, GHRH, somatostatin, dopamine - Posterior pituitary: vasopressin, oxytocin - Anterior pituitary: α FSH, LH, TSH, GH, prolactin, POMC ACTH, MSH, endorphins, lipotropin Adrenal axis Adrenal medulla: epinephrine, norepinephrine - Adrenal cortex: aldosterone, cortisol, DHEA Thyroid axis Thyroid: thyroid hormone T3 and T4 - calcitonin - Parathyroid: PTH Gonadal axis Testis: testosterone, AMH, inhibin - Ovary: estradiol, progesterone, inhibin/activin, relaxin pregnancy Other end. glands Pancreas: glucagon, insulin, somatostatin - Pineal gland: melatonin Non-end. glands Placenta: hCG, HPL, estrogen, progesterone - Kidney: renin, EPO, calcitriol, prostaglandin - Heart atrium: ANP - Stomach: gastrin, ghrelin - Duodenum: CCK, GIP, secretin, motilin, VIP - Ileum: enteroglucagon - Adipose tissue: leptin, adiponectin, resistin - Thymus: Thymosin - Thymopoietin - Thymulin - Skeleton: Osteocalcin - Liver/other: Insulin-like growth factor IGF-1, IGF-2 Target-derived NGF, BDNF, NT-3 Retrieved from http://en..org/wiki/Peptide_hormone Categories: Peptide hormones Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Deutsch Español Français Nederlands 日本語 Polski Svenska 中文 This page was last modified on 31 August 2008, at 08:44
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