HORMONES June 4, 2004. Interactive homeostatic system: communication between body and brain by means of neurons and factors circulating in blood.

Slides:



Advertisements
Similar presentations
Cell Communication Cells need to communicate with one another, whether they are located close to each other or far apart. Extracellular signaling molecules.
Advertisements

Cell Signaling A. Types of Cell Signaling
Types of Cellular Secretion of Hormones Blood Transport of Hormones General Mechanisms of Hormonal Actions Asha Alex Physiology.
Cell signalling 26 March 2007.
Chemical Regulating Systems
Cell To Cell Communication
A signal ___________________ pathway is a series of steps by which a signal on a cell’s surface is _______________into a specific cellular ______________.
1 Cell-Cell Interactions Chapter 7. 2 Outline Cell Signaling Receptor Proteins – Intracellular Receptors – Cell Surface Receptors Initiating the Intracellular.
Biology 107 Cellular Communication October 6, 2003.
2 nd lecture: Communications among cells and tissues Classification of hormones in Several Ways: According to solubility According to chemical composition.
Raven - Johnson - Biology: 6th Ed. - All Rights Reserved - McGraw Hill Companies Cell-Cell Interactions Chapter 7 Copyright © McGraw-Hill Companies Permission.
CHAPTER 9 LECTURE SLIDES
INTRODUCTION.
CELL CONNECTIONS & COMMUNICATION AP Biology Ch.6.7; Ch. 11.
1 Physiology Exam 1 Study Chapter 6 Communication & homeostasis.
Biology 107 Cellular Communication October 7, 2002.
Endocrine System Function and purpose of hormones
Cytokines Non-antibody proteins acting as mediators between cells, termed: Monokines – mononuclear phagocytes Lymphokines – activated T cells, especially.
Cell signaling Prof.Dr.Gönül Kanıgür. Cell Signaling All cells receive and respond to signals from their surroundings Signaling molecules that are secreted.
Cell signaling Cells do not work in isolation but continually ‘talk’ to each other by sending and receiving chemical signals to each other. This process.
Cell Signaling How cells communicate.
Cytokines Department of Microbiology. Important terms Cytokines: Proteinaceous messenger molecules of low molecular weight (usually of less than 30kDa),
Chemical Signals in Animals
Endocrine System. I. Endocrine system A. Endocrine tissues & organs are found throughout the body some along organs part of other systems others found.
Functional Organization of the Endocrine System
Hormones & the Endocrine System A hormone is a chemical signal that is dumped into the bodies circulatory system – Blood or lymph – Effects a great many.
Hormones and Response Pathways Kayla Owens Michael Drew Turner.
Option H: H.1 – Hormonal Control. Hormones Chemical messenger secreted directly into the bloodstream –Secreted by endocrine cells or neurosecretory cells.
Cellular Internet Cell to cell communication is essential in order for organisms to coordinate activities that develop, survive and reproduce Cell communication.
Chapter 16 Endocrine System Lecture 13 Part 1: Overview and Types of Hormones Marieb’s Human Anatomy and Physiology Ninth Edition Marieb  Hoehn.
Cytokines Basic introduction. Contents Definition General characteristics Types of cytokines Cytokine receptors and their types Biological functions of.
Cell Communication.
Cell Communication
Cell Communication.
2 types of cells are present in our body 1) Rulers a.cells of nervous system b.cells of endocrine glands 2) To be ruled all other cells of the body.
Cell Communication.
Cell Communication Chapter 9.
 Signaling molecules that function within an organism to control metabolic processes within cells, the growth and differentiation of tissues, the synthesis.
___________DEFENSES of the HOST: THE IMMUNE RESPONSE
Cell Communication. The Cellular “Internet” Within multicellular organisms, cells must communicate with one another to coordinate their activities A signal.
AP Biology Cell Communication. AP Biology Communication Methods  Cell-to-cell contact  Local signaling  Long distance signaling.
Cell Communication.
Plant Hormones and the Endocrine System Chapters 39 and 45 (in brief) Campbell Reece.
Copyright © 2014 Wolters Kluwer Health | Lippincott Williams & Wilkins Chapter 48 Mechanisms of Endocrine Control.
Cell Communication Ch. 6, 7, and 11. Direct Contact Plants plasmodesmata connect cytoplasm.
Chapter 11~ Cell Communication 2xnwU Pohttp://youtu.be/U6uHotlXv Po Real action in the body
Chapter 40 The endocrine system.
Cell Communication.
Metabolism module Introduction to Hormones Kufa Medical School.
INTRODUCTION TO ENDOCRINOLOGY I
How do you think cells communicate?
Cytokines Non-antibody proteins acting as mediators between cells, termed: Monokines – mononuclear phagocytes Lymphokines – activated T cells, especially.
The plasma membrane plays a key role in most cell signaling
Cell Communication.
Hormones and the Endocrine system
Cell Communication Keri Muma Bio 6.
SIGNALLING MOLECULES Hormones
Cell Communication Review
Cell Communication.
Cell Communication.
Cell Communication Chapter 9.
Cell Communication.
Cell Communication.
FROM BLOOD TO CELLS Pancreas and liver regulate blood glucose in a feedback loop.
Cell Communication.
Cell Communication.
Cell Communication.
Cell Communication CHAPTER 11.
Cell Signal Transduction and Diseases
Cell Communication.
Presentation transcript:

HORMONES June 4, 2004

Interactive homeostatic system: communication between body and brain by means of neurons and factors circulating in blood

Endocrinopathies

Effects of hormones  Pleoitrophism:  one hormon has more effects in different tissue  more hormones modulate one function

Output of the cell  Acute - monotrophic  Chronic-pleiotrophic  Responsive cell- the cell able to realize postreceptively adequate response  Receptive cell- the cell appointed by receptors

Effects of hormones  Acute - posttranslational effects  Chronicgenomic effects- trophic (cell growth and division) Receptor regulation types:  up-regulation (genomic effect)  down-regulation (membrane effect)

Hormone action and receptors Hormones act by binding to specific receptors in the target cell, which may be at the cell surface and/or within the cell. Hormones act by binding to specific receptors in the target cell, which may be at the cell surface and/or within the cell. Most hormone receptors are proteins with complex tertiary structures, parts of which complement the tertiary structure of the hormone to allow highly specific interactions, while other parts are responsible for the effects of the activated receptor within the cell. Many hormones bind to specific cell- surface receptors where they trigger internal messengers, while others bind to nuclear receptors which interact directly with DNA. Most hormone receptors are proteins with complex tertiary structures, parts of which complement the tertiary structure of the hormone to allow highly specific interactions, while other parts are responsible for the effects of the activated receptor within the cell. Many hormones bind to specific cell- surface receptors where they trigger internal messengers, while others bind to nuclear receptors which interact directly with DNA.

Hormone action and receptors. Cell-surface receptors usually contain hydrophobic sections which span the lipid-rich plasma membrane, while nuclear receptors contain characteristic amino-acid sequences to bind nuclear DNA (e.g. so-called 'zinc fingers') as in the glucocorticoid receptor. Cell-surface receptors usually contain hydrophobic sections which span the lipid-rich plasma membrane, while nuclear receptors contain characteristic amino-acid sequences to bind nuclear DNA (e.g. so-called 'zinc fingers') as in the glucocorticoid receptor.

The four classes of DNA-binding proteins

Manner of hormone secretion  Endocrine secretion – directly to the blood or indirectly through extracellular water compartment  Paracrine secretion – the hormone has not must not be secreted to the blood (growth factors, neuroparakrinia)  Autocrine secretion - f.i. presynaptic neuromodulation of NE release

Interaction hormone-receptor

Multireceptivity of the cell

Interaction hormone-receptor

Schema of human circadian system. RHT, retinohypothalamic tract; SCN, suprachiasmatic nucleus; PVN, paraventricular nucleus

Feedback control Feedback control

Hormone classes according to the structure Hormone classes according to the structure

Hormone binding globulins with small affinity and specifity for the hormone with small affinity and specifity for the hormone albumine, orozomukoid,  1 - acid glycoprotein albumine, orozomukoid,  1 - acid glycoprotein with high affinity and higher specifity for the hormone with high affinity and higher specifity for the hormone TBG, Transkortine (CBG), SHBG TBG, Transkortine (CBG), SHBG  binding proteins: Dysproteinemia acute and chronic Dysproteinemia acute and chronic  binding proteins Liver cirrhosis Liver cirrhosis

Effect of non- protein hormones on gene transcription

Hormonal activity At the molecular level there is little difference in the way cellular activity is regulated between classical neurotransmitters that act across synaptic clefts, intercellular factors acting across gap junctions, classic endocrine and paracrine activity and a variety of other chemical messengers involved in cell regulation - such as cytokines, growth factors and interleukins; progress in basic cell biology has revealed the biochemical similarities in the messengers, receptors and intracellular post-receptor mechanisms underlying all these aspects of cell function. At the molecular level there is little difference in the way cellular activity is regulated between classical neurotransmitters that act across synaptic clefts, intercellular factors acting across gap junctions, classic endocrine and paracrine activity and a variety of other chemical messengers involved in cell regulation - such as cytokines, growth factors and interleukins; progress in basic cell biology has revealed the biochemical similarities in the messengers, receptors and intracellular post-receptor mechanisms underlying all these aspects of cell function.

Signal transduction

Hypothalamic releasing hormones and the pituitary trophic hormones.

The hypothalamic-pituitary-thyroid axis. The green line indicates negative feedback at the hypothalamic and pituitary level

Effects ACTH at the level of the cell

Intracellular cortisol effect

Potential pathways by which circadian dysregulation may mediate psychosocial effects on cancer progression. Arrow (A) represents activation of endocrine stress-responses associated with psychological distress and other psychosocial factors. Repeated stress-response activation may hypothetically lead to dysregulation of circadian rhythms (B), while aberrations in sleep– wake cycles, rest-activity rhythms, genetic, or suprachiasmatic control of circadian rhythms would engender endocrine abnormalities (C). Hypotheses regarding direct effects of hormones on tumor growth involve metabolic pathways or influences on oncogene expression (D). Neuroimmune effects are widespread and include modulation of innate immunity, T and B cell function, cytokine and adhesion molecule expression, cell trafficking, and immune cell differentiation (E). Circadian rhythm aberration is associated with abnormalities of immune cell trafficking and cell proliferation cycles (F). It has been hypothesized that circadian clock genes are tightly linked with genes related to tumor growth and that tumors may be a direct consequence of circadian dysregulation (G). Immune defenses against tumor growth include both specific mechanisms (e.g., killing by cytotoxic T lymphocytes aided by helper T cells, B cell-mediated antibody-dependent lysis) and non-specific immunity (e.g., lytic activity of NK, LAK, and A-NK cells, macrophages, and granulocytes; H).. Arrow (A) represents activation of endocrine stress-responses associated with psychological distress and other psychosocial factors. Repeated stress-response activation may hypothetically lead to dysregulation of circadian rhythms (B), while aberrations in sleep– wake cycles, rest-activity rhythms, genetic, or suprachiasmatic control of circadian rhythms would engender endocrine abnormalities (C). Hypotheses regarding direct effects of hormones on tumor growth involve metabolic pathways or influences on oncogene expression (D). Neuroimmune effects are widespread and include modulation of innate immunity, T and B cell function, cytokine and adhesion molecule expression, cell trafficking, and immune cell differentiation (E). Circadian rhythm aberration is associated with abnormalities of immune cell trafficking and cell proliferation cycles (F). It has been hypothesized that circadian clock genes are tightly linked with genes related to tumor growth and that tumors may be a direct consequence of circadian dysregulation (G). Immune defenses against tumor growth include both specific mechanisms (e.g., killing by cytotoxic T lymphocytes aided by helper T cells, B cell-mediated antibody-dependent lysis) and non-specific immunity (e.g., lytic activity of NK, LAK, and A-NK cells, macrophages, and granulocytes; H).