HW410 Chapter 4: "Stress and Disease" Flashcards
Who postulated that when we make contact with a pathogenic microbe (some virus or bacterium), our immune system is alerted immediately and goes on the defensive?
Louis Pasteur.
Who suggested that good living practices, including one’s attitude and sound nutrition, were essential to keep the body at its optimal level of health, thereby creating an infertile and inhospitable place for the seeds of microorganisms to germinate?
Claude Bernard, a brilliant French physiologist and philosopher. Coined the term homeostasis.
A chicago-based physician, Franz Alexander, coined the term to organ neurosis which was later called what to describe the precarious mind-body relationship?
Psychosomatic: A term coined from Franz Alexander’s term organ neurosis, used to describe a host of physical illnesses or diseases caused by the mind and unresolved emotional issues.
What is the current focus on the stress-and-disease phenomenon is directed towards?
The interactions of the immune system, the CNS, and human consciousness.
To understand the relationship between stress and disease, you must understand what?
That several factors act in unison to create a pathological outcome. These include the cognitive perceptions of threatening stimuli and the consequent activation of the nervous system, the endocrine system, and the immune system.
What is defined as the study of the effects of stress on disease; treats the mind, central nervous system, and immune system as one interrelated unit?
Psychoneuroimmunology (PNI)
As defined by Pelletier (1988), psychoneuroimmunology is “the study of the intricate interaction of consciousness (psycho), brain and central nervous system (neuro), and the body’s defense against external infection and internal aberrant cell division (immunology).”
What does the Borysenko Model dichotomy broadly divide?
Divides disease and illness into either autonomic dysregulation (overresponsive autonomic nervous system) or immune dysregulation
What is defined as increased sensitivity to perceived threats resulting from heightened neural (sympathetic) responses speeding up the metabolic rate of one or more organs?
Autonomic dysregulation
What is defined as an immune system wherein various functions are suppressed; now believed to be affected by emotional negativity?
Immune dysregulation
What has the purpose to protect the body from pathogens, either externally generated (e.g., bacteria) or internally manufactured (e.g., mutant cells), which impede the proper functioning of the body’s regulatory dynamics?
The immune system.
What is a good metaphor to explain the immune system?
The immune system acts like the collective branches of the armed services to ensure national security by protecting the country from both invading forces and internal insurrection.
What, throughout life, supplies the lymph tissue with stem cells (the precursors to various lymphoid cells), that eventually become B-lymphocytes (B-Cells)?
Bone Marrow (Part of the immune system’s network of organs)
What gland that is below the throat that allows stem cells to mature into T-lymphocytes (T-Cells)?
The thymus gland.
Where are T-cells and B-cells occasionally house and migrate to?
The lymph nodes, spleen and gut-associated lymphoid tissue. Other aspects of the immune system include the tonsils, and unique lymphoid tissue associated with the bronchioles, genitals, and skin.
What do T-cells and B-cells readily prepare to encounter as their respective targets?
Antigens. These are molecules that make up a pathogen and they have the capacity to interact with various receptor sites on several types of immune system cells.
What is defined as immune system cells (t cells and b cells) that are housed throughout the lymphatic system, with 2 percent in circulation at any one time?
Lymphocytes. The remaining 98 percent constitute a dynamic defense system, housed and circulated through various organs of the lymphatic system.
What family of cells constitute the major component of the immune system where lymphocytes are one of five types?
Leukocytes. They are produced in the bone marrow where they eventually migrate to the peripheral organs of the lymphatic system.
Who are the other members of the leukocyte family?
The other members of the leukocyte family include granulocytes, macrophages (which seem to collaborate with T-cells and B-cells to help identify antigens for destruction), and eosinophils and basophils, which have a lesser role with altered immune function.
What is the job of the T-cells?
T-lymphocytes are primarily responsible for cell-mediated immunity—that is, the elimination of internally manufactured antigens (e.g., mutinous cells) in organ tissue.
In an action similar to scanning a grocery store product for its bar code, each T-cell travels throughout the body to scan all other cells for a match between their DNA structure and its own.
What is currently believed about mutant cells?
It is currently believed that the human body produces one mutant cell approximately every couple of hours.
What do T-cells release in their direct attack on mutant cells?
Cytokines.
What is the job of the B-cells?
Primarily the elimination of pathogenic microorganisms that contribute to infectious diseases, including viruses and bacteria.
T-lymphocytes has three subgroups (one additional immune cell as well) in the family of cells that makeup a major component of the immune system (Leukocytes). What are they?
T-cytotoxic cells, T-helpers (CD4), and T-suppressors (CD8).
The one immune cell is called the NK cell that collaborates with the T-cytotoxic cells to do its function.
What is defined as best known as the cells that attack and destroy tumorous cells by releasing cytokines?
T-cytotoxic cells.
The basic T-cells release cytokines, which then allow the cells to become sensitized to identify endogenous antigens on the cell membrane for destruction. In addition, with the help of macrophages, they attack and destroy tumorous cells.
What is defined as also known as CD4, these cells help in the production of antibodies released by T-cells?
T-helpers.
Clinically labeled as CD4, these cells appear to increase the production of antibodies released by T-cells. T-helpers and T-suppressors are referred to as immunoregulatory cells because they regulate cell-mediated immunity (T-cell) and humoral antibody (B-cell) response.
What is defined as also known as CD8, these cells decrease the production of antibodies, thus keeping a healthy balance of T-cells?
T-suppressors.
Clinically labeled as CD8, these cells appear to decrease the production of antibodies necessary to assist T-cells in attacking and killing endogenous antigens. A reduction in CD8 is believed to keep cytotoxic T-cells in check so that they do not attack self-proteins and thereby cause degeneration of healthy tissue. A reduction in CD8 is thought to be associated with arthritis and lupus. (Borysenko notes that clinical tests show a 2:1 ratio of CD4:CD8 to be normal, whereas a ratio less than this is a signal that this aspect of the immune system is deficient.)
What is defined as large lymphocytes that can detect endogenous antigens, thus helping to destroy mutant cells?
Natural killer (NK) cells.
Unlike cytotoxic T-cells, these immune cells (large lymphocytes) appear to have an innate ability to detect endogenous antigens without the help of any neuropeptides to sensitize them or previous memory experience. NK cells collaborate with cytotoxic T-cells to destroy mutant cells, virus-infected cells, and transplanted grafts. NK cells have a unique role in immune surveillance to detect malignant cell changes. Among immunologists, NK cells are known as “psychosocial friendly cells” because they mirror emotional states (ups and downs) of the mind.
Fun knowledge:
What are the two theories of disease that have made a emergence?
What is the third newest in respect to this question?
Germ theory of disease, which ushered in the age of antibiotics and vaccinations.
The Genome Project, which seeks to link every disease to a defective gene in our DNA.
The Human Microbiome. Researchers now call the intestinal flora, which is composed of trillions of healthy bacteria, the “microbiome.” The premise of the microbiome is that each human being is actually a multispecies superorganism.
Perhaps the biggest take-home message about a compromised microbiome is its association with inflammation. Inflammation (excessive oxidation of tissues) is associated with many chronic diseases, and stress seems to be a major trigger for inflammation.
According to Borysenko’s model, what is a result of the immune system not working as homeostatically intended?
The result is immunological overreaction, underreaction, or perhaps both.
What is an example of an exogenous (growing or originating from outside an organism) event because of an overreacting immune system?
What about underreacting immune system?
Allergies.
Infections (cold and flu)
Herpes can be caused in underreactions.
What is an example of an endogenous (growing or originating from within an organism) event because of an overreacting immune system?
What about underreacting immune system?
Arthritis and Lupus.
Cancer.
Herpes can be caused in underreactions.
What is another term for neoplasms?
Cancerous Tumors.
What is another term for neoplasms?
Cancerous Tumors.
What is defined as diseases that occur because of an overactive immune system, which “attacks the body.” Examples include lupus and rheumatoid arthritis.
Autoimmune diseases.
What is important to note about an overreaction and underreaction?
Note that you can have an allergic reaction (overreaction) and a cold (underreaction) at the same time because they are produced by different dynamics.
In support of Borysenko’s model, what ongoing research to understand the link between stress and the immune system?
Acute psychological stress decreases NK cell activity through a profound effect on cytokine production. Chronic stress is observed to suppress NK cell activity, thereby increasing one’s susceptibility to infections and cancer
What secondary effect has been observed other than what has been seen in cytokines and stress?
Stress-related changes in the immune system have been observed in secondary lymphoid tissue (spleen, lymph nodes) where T-cells are produced. Lymphoid tissues, bathed in a “hormonal milieu,” appear to be significantly affected by emotions and thought processing.
The Pert Model
Until recently, it was thought that there was no direct link between the nervous system and the immune system; virtually all physiologists believed that these two systems acted independently.
What connections with the CNS and immune system have been discovered to show that they might not be independent of each other?
Researchers have isolated neural endings connecting the CNS to the thymus, lymph nodes, spleen, and bone marrow.
Tonsils, adenoids, and some cells of the small intestine have been found to be innervated by sympathetic nerve fibers.
What is defined as the unique messenger hormones produced in the brain (and other organs of the body) that fit into the receptor sites of lymphocytes?
Neuropeptides. Different from the efferent/afferent system and they influenced by emotional responses.
What did Candace Pert discover?
Lymphocytes have built-in receptor sites for neuropeptides. Neuropeptides is also a recent discovery.
What does the brain produce endogenously that is associated with chemical addictions?
Its own (endogenous) opiates, neurotransmitters that have a similar effect to those manufactured externally, such as morphine.
What is the most publicized neuropeptide (chemical messenger) that is just one of hundreds and are associated with mood changes and immune regulation?
Beta-endorphin.
What does Pert suggest there is only one of?
Neuropeptide molecule that, like a chameleon, changes its configuration as a result of emotional influences.
What is hypothesized on how the spontaneous change in a neuropeptide can happen?
May be accounted for by the wavelike oscillations or vibrations of the electrons in each neuropeptide molecule.
Pert’s hypothesis parallels work conducted by German physicist Fritz-Albert Popp, who discovered that DNA is capable of sending out a large range of frequencies, with each frequency being associated with a particular metabolic function.
What discovery was made by Pert about neuropeptides and their production?
Originally thought that neuropeptides receptors were created in the brain because the hypothalamus as the largest preponderance of neuropeptide receptors.
Her research revealed that throughout the body immune cells not only have receptors for neuropeptides, but also can manufacture them independently.
These same immune cells seem to have a kind of memory that enables them to adapt and respond to emotional responses.