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- •The Endocrine System
- •SERIES EDITOR FOREWORD
- •PREFACE
- •ACKNOWLEDGEMENTS
- •Interesting fact
- •The transport and metabolism of hormones
- •Important concepts in endocrine regulation
- •Episodic secretion
- •Diurnal variation
- •Set point regulation
- •CONTENTS
- •What is endocrinology?
- •Interesting fact
- •What do hormones do?
- •Types of hormone: their synthesis and secretion
- •Endocrine axis
- •Negative feedback
- •Hormone antagonism and synergy
- •Endocrine disorders
- •Endocrine investigations: general principles
- •Interesting fact
- •Biological samples
- •Imaging
- •Ectopic hormone secretion
- •Interesting fact
- •Introduction
- •Receptor agonists and antagonists
- •Dose–response effects
- •Receptor binding properties
- •Interesting fact
- •Ligand properties
- •Types of hormone receptors
- •Interesting fact
- •Second messenger systems
- •Cyclic AMP
- •Phosphatidylinositol bisphosphate
- •Calcium signalling
- •Interesting fact
- •Protein kinases and phosphatases
- •Receptor desensitisation and downregulation: GPKs and beta arrestin
- •Interesting fact
- •Receptors that directly activate a protein kinase
- •The insulin and growth factor receptor family: receptors with inherent tyrosine kinase activity
- •Interesting fact
- •The growth hormone and cytokine receptors: receptors that attract kinases
- •Hormonal regulation of transcription
- •Intracellular receptors
- •Interesting fact
- •Class I receptors
- •Class II receptors
- •Interesting fact
- •Disorders of receptor function
- •Introduction
- •Where can I find the hypothalamus and pituitary?
- •Interesting fact
- •Connection between the hypothalamus and pituitary
- •Development of the hypothalamus and pituitary
- •The hormones of the hypothalamus
- •The hormones of the posterior pituitary
- •Interesting fact
- •Release of posterior pituitary hormones is part of a neuroendocrine reflex: oxytocin secretion and actions
- •Regulation of vasopressin secretion
- •Actions of arginine vasopressin
- •Interesting fact
- •Disorders of vasopressin secretion and action
- •Deficiency
- •Interesting fact
- •Excess arginine vasopressin secretion
- •Thirst
- •Other hypothalamic hormones
- •Introduction
- •Structure of the anterior pituitary
- •The hormones of the anterior pituitary
- •Interesting fact
- •Regulation of hormone secretion in the anterior pituitary
- •Growth hormone and prolactin
- •Regulation of growth hormone secretion
- •Regulation of prolactin secretion
- •Growth hormone and prolactin in blood
- •Actions of the anterior pituitary hormones: growth hormone and prolactin
- •Actions of growth hormone
- •Growth hormone receptors
- •Growth
- •Metabolism
- •Interesting fact
- •Actions of prolactin
- •Interesting fact
- •Disorders of anterior pituitary function: oversecretion
- •Excess growth hormone secretion
- •Interesting fact
- •Blood supply
- •Interesting fact
- •Nerve supply
- •Embryology of the adrenal gland
- •Introduction
- •Structure
- •Interesting fact
- •The hormones of the adrenal medulla
- •Regulation of catecholamine secretion
- •Transport and metabolism of adrenal medullary hormones
- •Actions of adrenal medullary hormones
- •Treatment of acromegaly
- •Interesting fact
- •Excess prolactin secretion
- •Disorders of undersecretion of anterior pituitary hormones
- •Interesting fact
- •Tests for hypopituitarism
- •Insufficient growth hormone secretion
- •Interesting fact
- •Introduction
- •Where to find the adrenal glands
- •Disorders of the adrenal medulla: phaeochromocytoma
- •Interesting fact
- •Familial phaeochromocytoma
- •Pharmacological uses of hormones of the adrenal medulla
- •Endocrine hypertension
- •THE ADRENAL CORTEX
- •Introduction
- •Structure of the adrenal cortex
- •Hormones produced by the adrenal cortex
- •Steroid biosynthesis (steroidogenesis)
- •Cholesterol
- •Defects of steroid biosynthesis
- •Cortisol: the hypothalamo–pituitary–adrenal axis
- •The actions of ACTH (Fig. 6.9)
- •Aldosterone: the renin–angiotensin system
- •Interesting fact
- •DHEA/S
- •Transport of steroid hormones in blood
- •Actions of adrenal steroids
- •Physiological actions of cortisol
- •Physiological actions of aldosterone
- •Interesting fact
- •Actions of adrenal androgens
- •Interesting fact
- •Congenital adrenal hyperplasia (CAH)
- •Glucocorticoid excess
- •Investigations of glucocorticoid excess
- •Interesting fact
- •Mineralocorticoid excess (Conn syndrome)
- •Adrenal insufficiency
- •Pharmacological uses of glucocorticoids
- •Interesting fact
- •Steroid treatment card
- •Introduction
- •Thyroid anatomy
- •What is a goitre?
- •Blood supply
- •Interesting fact
- •Structure of the thyroid
- •Synthesis of thyroid hormones
- •Iodine
- •Interesting fact
- •Thyroxine and T3: the thyroid hormones in blood
- •Interpretation of thyroid function test results
- •Interesting fact
- •Control of thyroid function
- •Cellular action of thyroid hormones
- •Effects of thyroid hormones
- •Metabolic and respiratory effects
- •Cardiovascular effects
- •Disorders of thyroid hormone secretion
- •Disorders of the thyroid: hyperthyroidism
- •Effects of excess thyroid hormone secretion: thyrotoxicosis
- •Treatment of thyrotoxicosis
- •Causes of thyroid hyposecretion
- •Iodine deficiency hypothyroidism
- •Effects of thyroid hormone insufficiency in adults
- •Treatment of hypothyroidism
- •Introduction
- •Where are the testes?
- •Interesting fact
- •What are the testes?
- •Testicular blood and nerve supply
- •Spermatogenesis
- •Interesting fact
- •Androgen production
- •Hormonal control of testicular function
- •Control of testosterone secretion (Leydig cell function)
- •Control of spermatogenesis (Sertoli cell function)
- •Interesting fact
- •Transport of testosterone in blood
- •Actions of testosterone
- •Cellular actions of androgens
- •Interesting fact
- •Physiological actions of androgens
- •Actions of oestrogens in men
- •Interesting fact
- •Disorders of male reproduction
- •Primary hypogonadism
- •Secondary hypogonadism
- •Tertiary hypogonadism
- •Therapeutic uses of androgens
- •Abuse of anabolic androgenic steroids
- •Declining sperm counts
- •Introduction
- •Structure of the ovary
- •Ovarian hormones
- •Transport and metabolism of oestrogen and progesterone
- •Oestrogens
- •Cellular actions of oestrogens (Fig. 9.6)
- •Physiological actions of oestrogens
- •Interesting fact
- •Progesterone
- •Actions of progesterone
- •Androgen secretion by the ovaries
- •Ovarian peptide hormones
- •Inhibin
- •Activin
- •Relaxin
- •Hormonal regulation of ovarian function
- •The menstrual cycle
- •The menstrual phase
- •The follicular phase (also called the proliferative phase)
- •The LH surge and ovulation
- •The luteal phase (also called the secretory phase)
- •Interesting fact
- •Disorders of the menstrual cycle
- •Hypothalamic causes
- •Pituitary causes
- •Premature ovarian failure
- •Polycystic ovarian syndrome
- •Interesting fact
- •The placenta
- •Hormone secretion by the placenta
- •Interesting fact
- •The foeto–placental unit
- •Interesting fact
- •Endocrine control of parturition
- •Lactation
- •Introduction
- •Gender determination and differentiation
- •Hormonal control of sexual differentiation
- •Abnormalities of sexual differentiation
- •Interesting fact
- •Interesting fact
- •Hormones during development: puberty and menarche
- •Pubertal development in boys
- •Pubertal development in girls
- •Interesting fact
- •Disorders of puberty
- •Gynaecomastia
- •Menopause and the climacteric
- •Interesting fact
- •Premature ovarian failure
- •Symptoms of the menopause
- •Hormone replacement therapy
- •Alternative therapies
- •Interesting fact
- •Hormonal control of fertility: contraception
- •The oral contraceptive pill
- •Emergency hormonal contraception
- •A male contraceptive pill?
- •Hormonal control of fertility: assisted conception
- •Simple induction of ovulation
- •Preparation for IVF treatment or egg donation
- •Introduction
- •Sources of plasma glucose
- •Glucose in urine
- •Insulin and the response to high blood glucose levels
- •Anatomy of the pancreas
- •The endocrine pancreas
- •Synthesis and secretion of insulin
- •Regulation of insulin secretion
- •Insulin in blood
- •What does insulin do?
- •The insulin receptor
- •Glucagon and other hormones that act to raise blood glucose levels
- •Disorders of blood glucose regulation: diabetes mellitus
- •The oral glucose tolerance test
- •Diet
- •Insulin therapy
- •At home
- •In the diabetes clinic
- •Diabetic ketoacidosis
- •Hypoglycaemic coma
- •Management of type 2 diabetes
- •Hypoglycaemia
- •Gestational diabetes
- •Metabolic syndrome – a growing problem?
- •Diagnosis of the metabolic syndrome
- •The first description of the metabolic syndrome
- •How is metabolic syndrome treated?
- •Introduction
- •Serum calcium
- •Sources of serum calcium
- •The structure, functions, and endocrinology of bone
- •Bone growth
- •Bone cells
- •The endocrinology of bone
- •Hormones involved in the regulation of serum calcium
- •The parathyroid glands
- •Secretion of parathyroid hormone
- •Actions of parathyroid hormone
- •Parathyroid hormone related peptide (PTHrp)
- •Calcitriol: source and activation of vitamin D
- •Vitamin D and calcitriol in blood
- •Actions of calcitriol
- •Effects on plasma calcium and bone
- •Effects on the immune system
- •Effects on cancer
- •Therapeutic uses of vitamin D3
- •Effects of other hormones on plasma calcium
- •Disorders of hypercalcaemia
- •Treatment
- •Effects of excess vitamin D
- •Disorders of hypocalcaemia
- •Vitamin D deficiency
- •Parathyroid hormone deficiency
- •Osteoporosis
- •Osteomalacia and rickets
- •Paget disease
- •A brief mention of calcitonin
- •Regulation of serum phosphate
- •Erythropoietin
- •Immune–endocrine interactions: cytokines and eicosanoids
- •Cytokines
- •Eicosanoids
- •Hormone replacement therapy in ageing
- •Melatonin
- •Gut hormones
- •The hormonal control of appetite
- •Multiple endocrine neoplasia (MEN)
- •Autoimmune polyglandular endocrinopathy
- •Regulation of blood pressure and volume
- •The next 100 years of endocrinology
- •GLOSSARY
- •Index


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2020_ME

The Endocrine System

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SYSTEMS OF THE BODY
The Endocrine System
BASIC SCIENCE AND CLINICAL CONDITIONS
THIRD EDITION
Joy Hinson BSc, PhD, DSc, PFHEA, FRSB
Professor Emerita of Endocrine Science
Formerly Dean for Postgraduate Studies
Barts and the London School of Medicine and Dentistry;
Queen Mary University of London
London, UK
Peter Raven
BSc, PhD, MBBS, MRCP, MRCPsych, FHEA
Now retired, formerly Faculty Tutor (Biomedical Sciences),
UCL
Deputy Director of Medical Education, UCL Medical School;
and Honorary Consultant Psychiatrist
Camden and Islington Mental Health Trust
London, UK
Series Editor
Shern Chew
BSc, MD, FRCP
Professor of Endocrine Medicine/Consultant Physician
Barts and the London School of Medicine and Dentistry;
Queen Mary University of London
London, UK
Stephen Hughes
BSc, MSc, MBBS, FRCSEd, FRCEM, FHEA
Consultant in Emergency Medicine, Broomfield Hospital;
Senior Lecturer in Medicine, School of Medicine, Anglia
Ruskin University
Chelmsford, UK
For additional online content visit ExpertConsult.com

© 2023, Elsevier Limited. All rights reserved.
First edition 2003
Second edition 2010
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying, recording, or any information storage and retrieval system, without
permission in writing from the publisher. Details on how to seek permission, further information about the
Publisher’s permissions policies and our arrangements with organizations such as the Copyright Clearance
Center and the Copyright Licensing Agency, can be found at our website: www.elsevier.com/permissions
This book and the individual contributions contained in it are protected under copyright by the Publisher
(other than as may be noted herein).
Notices
Practitioners and researchers must always rely on their own experience and knowledge in evaluating and
using any information, methods, compounds or experiments described herein. Because of rapid advances
in the medical sciences, in particular, independent verication of diagnoses and drug dosages should be
made. To the fullest extent of the law, no responsibility is assumed by Elsevier, authors, editors or contributors for any injury and/or damage to persons or property as a matter of products liability, negligence or
otherwise, or from any use or operation of any methods, products, instructions, or ideas contained in the
material herein.
ISBN: 978-0-7020-8327-3
Publisher: Jeremy Bowes
Content Project Manager: Fariha Nadeem
Design: Margaret Reid
Illustration Manager: Anitha Rajarathnam
Marketing Manager: Deborah Watkins
Copyedited by Editage, a unit of Cactus Communications Services Pte. Ltd.
Typeset by TNQ Technologies Pvt. Ltd.
Printed in Poland
Last digit is the print number: 9 8 7 6 5 4 3 2 1

This book is dedicated to the memory of Dr Saad Al- Damluji, endocrinologist and teacher.

SERIES EDITOR FOREWORD
Many students study medicine through an integrated
curriculum. These courses blend basic science with
exposure to clinical medicine from an early stage. These
students have the good fortune to be left in no doubt,
from the outset, why they are studying medicine. I teach
in a medical school that delivers a fully integrated curriculum and I can compare it with the traditional model
according to which I received my early medical education. That com parison is very favourable.
Unlike many other texts, the Systems of the Body series
has been designed very specifically to sup port an integrated approach to learning medicine. Our carefully
selected panel of authors drawn from across the Englishspeaking world have combined basic sci ence with
clinical application. Links to clinical skills, clinical investigation and therapeutics are made clear throughout.
The aim is to offer highly accessible guidance for all
student types and stages. It will be invaluable to those
who are approaching the subject for the first time or
who may have found a topic challenging when using
other more traditionally configured resources – as well as
greatly assist all students wishing to excel as their course
progresses. The clear layout and writing style, together
with detail that informs without overwhelming, go a
long way to supporting students. It may also provide
welcome reminders to postgraduates facing their own
examinations.
Whatever curriculum you follow, wherever you
are in the world, and whichever stage you are at, we
know that the Systems of the Body volumes will serve as
great places to start when learning something new and
enable you to effectively piece together the essential
components of each major body system, in a modern
clinical context.
Good luck!
Stephen Hughes, MSc MBBS FRCSEd FRCEM FHEA
Senior Lecturer in Medicine
Anglia Ruskin University
Chelmsford, UK
and
Consultant, Emergency Medicine
Broomfield Hospital
Chelmsford, UK

PREFACE
Endocrinology is really very simple. You can either have
too much of a hormone … or too little.
(Professor John Landon’s traditional
and reassuring introduction to his
endocrinology teaching.)
The first edition of this book was aimed primarily at
medical students, particularly those taking a modern,
integrated course. The second edition was enlarged and
expanded to include more detail of physiological and
biochemical mechanisms. This third edition has been
revised and fully updated. We hope that this edition will
be used by students of the biomedical sciences as well as
medical students.
The book is intended as a broad general introduction
to the Endocrine System, although we hope that you will
be sufficiently enthused after reading it to wish to take
your studies further in this exciting and fast- moving
area.
Each chapter is structured around clinical cases.
Endocrinology is at its most interesting when considered
in the context of what happens when things go wrong.
These cases have been chosen to illustrate important
points about either the biochemistry of hormone synthesis or the physiology of endocrine regulation. This will
allow medical students early in their studies to understand the clinical relevance of the basic science. However,
we hope that the book will also allow clinical students
to understand the basic science underlying endocrine
disease.
In the clinical cases featured in this book we have tried
to show common presentations of the different disorders,
but endocrine problems present in such a wide variety
of ways that students should not be misled into thinking
that these are the only presentations!
The ‘Interesting facts’ we included in the first edition
have been added to. These are snippets of information
that particularly interested us and that we wanted to
share with you. We hope that you will find them interesting too.
The first two chapters are not case- based; these contain details of the basic concepts needed to understand
hormones and their actions. The final chapter describes
a mixture of hormones and other signalling molecules
with varying degrees of clinical importance. This chapter
illustrates perfectly the idea that endocrinology is rather
more than a stand- alone speciality, but, rather, it is a subject which impinges on the cardiovascular system, the
immune system, and all other systems of the body.
We do hope that we have managed to convey to you
our enthusiasm for this most fascinating subject.

ACKNOWLEDGEMENTS
We are most grateful to all our colleagues for their help
and advice in the preparation of this book. In particular, we would like to thank: Dr Dan Berney for providing the histology, Dr Norbert Avril for the whole- body
glucose image, and Dr Alistair Chesser for the EPO case.
Although many colleagues have helped and advised us,
all errors remain our own. Thanks are due also to the
team at Elsevier.
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