In 9840 Cell and Molecular Biology By Dr. Valerie Apricot
Is the branch in biology which deals with the structure, function, pathology and life history of cells.
The cell membrane (or plasma membrane or plasma ligament) surrounds the cytoplasm of living cells, physically separating the intracellular components from the extracellular environment. Bacteria and plants also have a cell wall in addition, which provides a mechanical support to the cell and precludes the passage of larger molecules. The cell membrane also plays a role in anchoring the cytoskeleton to provide shape to the cell, and in attaching to the extracellular matrix and other cells to help group cells together to form tissues.
The cell membrane is selectively permeable and able to regulate what enters and exits the cell, thus facilitating the transport of materials needed for survival. The movement of substances across the membrane can be either “passive”, occurring without the input of cellular energy, or “active”, requiring the cell to expend energy in transporting it. The membrane also maintains the cell potential. The cell membrane thus works as a selective filter that allows only certain things to come inside or go outside the cell. The cell employs a number of transport mechanisms that involve biological membranes:
- Passive osmosis and diffusion: Some substances (small molecules, ions) such as carbon dioxide (CO2) and oxygen (O2), can move across the plasma membrane by diffusion, which is a passive transport process. Because the membrane acts as a barrier for certain molecules and ions, they can occur in different concentrations on the two sides of the membrane. Such a concentration gradient across a semipermeable membrane sets up an osmotic flow for the water.
- Transmembrane protein channels and transporters: Nutrients, such as sugars or amino acids, must enter the cell, and certain products of metabolism must leave the cell. Such molecules diffuse passively through protein channels such as aquaporin (in the case of water (H2O)) in facilitated diffusion or are pumped across the membrane by transmembrane transporters. Protein channel proteins, also called permeases, are usually quite specific, recognizing and transporting only a limited food group of chemical substances, often even only a single substance.
- Endocytosis: Endocytosis is the process in which cells absorb molecules by engulfing them. The plasma membrane creates a small deformation inward, called an invagination, in which the substance to be transported is captured. The deformation then pinches off from the membrane on the inside of the cell, creating a vesicle containing the captured substance. Endocytosis is a pathway for internalizing solid particles (“cell eating” or phagocytosis), small molecules and ions (“cell drinking” or pinocytosis), and macromolecules. Endocytosis requires energy and is thus a form of active transport.
- Exocytosis: Just as material can be brought into the cell by invagination and formation of a vesicle, the membrane of a vesicle can be fused with the plasma membrane, extruding its contents to the surrounding medium. This is the process of exocytosis. Exocytosis occurs in various cells to remove undigested residues of substances brought in by endocytosis, to secrete substances such as hormones and enzymes, and to transport a substance completely across a cellular barrier. In the process of exocytosis, the undigested waste-containing food vacuole or the secretory vesicle budded from Golgi apparatus, is first moved by cytoskeleton from the interior of the cell to the surface. The vesicle membrane comes in contact with the plasma membrane. The lipid molecules of the two bilayers rearrange themselves and the two membranes are, thus, fused. A passage is formed in the fused membrane and the vesicles discharges its contents outside the cell.
Cell membrane – Plasma Ligament – Knee
Cell therapy is the transplantation of human or animal cells to replace or repair damaged tissue.
The purpose of cell therapy is to introduce cells into the body that will grow and replace damaged tissue. Cell therapy differs from conventional stem cell therapy in that the cells injected into the body in cell therapy are already differentiated (e.g., muscle cells, gland cells), whereas conventional stem cell therapy utilizes undifferentiated, usually embryonic cells. Cell therapy has long been used by alternative medicine practitioners who have claimed great benefits; these have not been replicated by conventional medical practitioners.
The theory behind cell therapy has been in existence for several hundred years. The first recorded discussion of the concept of cell therapy can be traced to Phillippus Aureolus Paracelsus (1493-1541), a German-Swiss physician and alchemist who wrote in his Der grossen Wundartzney (Great Surgery Book) in 1536 that “the heart heals the heart, lung heals the lung, spleen heals the spleen; like cures like.” Paracelsus and many of his contemporaries agreed that the best way to treat an illness was to use living tissue to restore the ailing. In 1667, at a laboratory in the palace of Louis XIV, Jean-Baptiste Denis (1640-1704) attempted to transfuse blood from a calf into a mentally ill patient. Since blood transfusion is, in effect, a form of cell therapy, this could be the first documented case of this procedure. However, the first recorded attempt at non-blood cellular therapy occurred in 1912 when German physicians attempted to treat children with hypothyroidism (underactive thyroid gland), with thyroid cells.
In 1931, Dr. Paul Niehans (1882-1971), a Swiss physician, became known as “the father of cell therapy” quite by chance. After a surgical accident by a colleague, Niehans attempted to replace a patient’s severely damaged parathyroid glands with those of a steer. When the patient began to rapidly deteriorate before the transplant could take place, Niehans decided to dice the steer’s parathyroid gland into fine pieces, mix the pieces in a saline solution, and inject them into the dying patient. He reported that immediately the patient began to improve and, in fact, lived for another 30 years.
Cell therapy as performed by alternative medicine practitioners is very different from the controlled research done by conventional stem cell medical researchers. Alternative practitioners refer to their form of cell therapy by several other different names including xenotransplant therapy, glandular therapy, and fresh cell therapy. The procedure involves the injection of either whole fetal xenogenic (animal) cells (e.g., from sheep, cows, pigs, and sharks) or cell extracts from human tissue. Several different types of cells may be administered simultaneously.
Just as Paracelsus’s theory of “like cures like,” the types of cells that are administered correspond in some way with the organ or tissue in the patient that is failing. In other words, the cells are not species specific, but only organ specific. Alternative practitioners cannot explain how this type of cell therapy works, but proponents claim that the injected cells travel to the similar organ from which they were taken to revitalize and stimulate that organ’s function and regenerate its cellular structure. Supporters of cellular treatment believe that embryonic and fetal animal tissue contain active therapeutic agents distinct from vitamins, minerals, hormones, or enzymes. This theory and these claims are rejected by practitioners of conventional medicine.
Proponents of cell therapy claim that it has been used successfully to rebuild damaged cartilage in joints, repair spinal cord injuries, strengthen a weakened immune system, treat autoimmune diseases such as AIDS, and help patients with neurological disorders such as Alzheimer’s disease, Parkinson’s disease, and epilepsy. Further claims of positive results have been made in the treatment of a wide range of chronic conditions such as arteriosclerosis, congenital defects, and sexual dysfunction. The therapy has also been used to treat cancer patients at a number of clinics in Tijuana, Mexico. Most of these claims are anecdotal. None of these application is supported by well-designed, controlled clinical studies.
Cell therapy as conventional medicine
Cell therapy in conventional medicine is still in the research and early clinical trial stage. This research is an outgrowth of stem cell research, and is performed in government-regulated laboratories by traditionally trained scientists. Embryonic stem cells are cells taken from an embryo before they have differentiated (specialized) into such specific cell types as muscle cells, nerve cells, or skin cells. In laboratory test tube and animal experiments, stem cells often can be manipulated into differentiating into specific types cells that have the potential to replace differentiated cells in damaged organs. For example, in early 2008, researchers at the Diabetic Research Institute at the University of Miami in Florida were able to convert embryonic stem cells into insulin-producing cells and use them to treat insulin-dependent diabetes in mice.
Stem cells also have been found in bone marrow, and work is underway to see if other cells can be manipulated into transforming into differentiated cells. In January 2009, researchers at Northwestern University’s Feinberg School of Medicine in Chicago announced that they had used a patient’s own bone marrow stem cells to improve early symptoms of multiple sclerosis. Researchers noted improvement only in patients with early symptoms; in earlier research those with advanced symptoms had not improved. Other researchers are working on treating symptoms of muscular dystrophy with fully differentiated myoblasts (a kind of muscle cell) with mixed results. Still other are working with using cartilage cells (chondrocyte cells) to repair cartilage in joints such as the knee.
Stem cell therapy has potential to treat a wide range of diseases and disorders, but it is, for the most part, still in the test tube and animal research stage of development. Because of the ethical questions raised when the harvesting of stem cells destroys embryos, the United States has placed restrictions on some human stem cell research. These restrictions, however, do not apply to research that does not destroy embryos. However, much stem cell research is being carried out in other countries, especially Thailand, South Korea, and China, where fewer restrictions are placed on obtaining human stem cells for experimentation. A list of FDA-approved clinical trials involving stem cell therapy can be found at http://www.clinicaltrials.gov.
Alternative practitioners use several processes to prepare cells for use. One procedure involves extracting cells from the patient and then culturing them in a laboratory until they multiply to the level needed for transplantation back into the same patient. Another procedure uses freshly removed fetal animal tissue that has been processed and suspended in a saline (salt water) solution. The preparation of fresh cells then may be either injected immediately into the patient or preserved by being freeze-dried or deep-frozen in liquid nitrogen before being injected. Injected cells may or may not be tested for pathogens, such as bacteria, viruses, or parasites, before use. Conventional cell therapy researchers work in laboratories where the growing environment of the cells is highly controlled and monitored to prevent contamination.
Many forms of cell therapy in the United States are highly experimental procedures. Patients should approach any cell therapy treatments with extreme caution, inquire about their proven efficacy and legal use in the United States or their home country, and should only accept treatment only from a licensed physician who should educate the patient completely on the risks and possible side effects involved with cell therapy. These same cautions apply for patients interested in participating in FDA-approved clinical trials of cell therapy treatments.
Because cell therapy encompasses a wide range of treatments and applications and many of these treatments are unproven and highly experimental, the full range of possible side effects of the treatments is not yet known. Anaphylactic shock, immune system reactions, and encephalitis are just a few of the known reported side effects in some patients to date.
Patients undergoing cell therapy treatments which use cells transplanted from animals or other humans run the risk of cell rejection, in which the body recognizes the cells as a foreign substance and uses immune system cells to attack and destroy them. Some forms of cell therapy use special coatings on the cells in an attempt to trick the immune system into recognizing the new cells as native to the body. There is also the chance of the cell solution transmitting a bacterial, viral, fungal, or parasitic infection to the patient. Careful screening and testing of cells for pathogens can reduce this risk.
Side effects of the FDA-approved chondrocyte cell therapy used in knee joint repair may include tissue hypertrophy, a condition where too much cartilage grows in the joint where the cells were transplanted into and the new joint begins to stiffen.
Dr. Brian Fotso also noted that in some cases, the effects of plasma ligament injuries occurred to patients who consumed animal cartilage in excess and where recommended to undergo cell therapy lasting for 3 to 6 months. Less consumption of such products played positive results in reducing such effects.
Cell therapy as an alternative medicine, is generally rejected as effective by the traditionally-trained scientific community. Most of the claims made for these therapies are based on anecdotal evidence and are not backed by controlled clinical trials. While some mainstream cell therapy procedures have shown some success in clinical studies, others are still largely unproven, including cell therapy for cancer treatment. Until large, controlled human clinical studies are performed on cell therapy procedures, they will remain fringe treatments.
- Steenblock,DavidandAnthonyPayne.Umbilical Cord Stem Cell Therapy: The Gift of Healing from Healthy Newborns. Laguna Beach, CA: Basic Health Publications, 2006.
- Pollack,”StemCellTherapyControlsDiabetes in Mice.”New York Times. February 21, 2007 [cited February 2, 2009] http://www.nytimes.com/2008/02/21/health/research/21stem.html.
- “Cellular”Quackwatch. 2003 [cited February 2, 2009]. http://www.quackwatch.com/01QuackeryRelatedTopics/Cancer/cellular.html.
- ” Multiple Sclerosis ‘Reversed’ with Stem Cell ” New Scientist Health. January 30, 2009 [cited February 2, 2009]. http://www.newscientist.com/article/dn16509-multiple-sclerosis-reversed-with-stem-cell-therapy.html.
- Fotso, Brian. “Cell and Molecular Biology – Chapter 10 —– Cell Therapy” [cited June 15th, 2012] https://masoblogdotcom.wordpress.com/classes/
- Valerie Apricot. “Cell and Molecular Biology – Chapter 10 —– Cell Therapy” [cited June 15th, 2002] https://masoblogdotcom.wordpress.com/classes/
- AlternativeMedicine P. O. Box60016,Potomac, MD 20859.(301)340-1960.http://www.amfoundation.org.
- CenterforCellandGeneBaylorCollege of Medicine.OneBaylorPlaceN1002,Houston, TX 77030(713)798-1246.http://www.bcm.edu/genetherapy.
Cellulitis is a spreading bacterial infection just below the skin surface. It is most commonly caused by Streptococcus pyogenes or Staphylococcus aureus.
The word “cellulitis” actually means “inflammation of the cells.” Specifically, cellulitis refers to an infection of the tissue just below the skin surface. In humans, the skin and the tissues under the skin are the most common locations for microbial infection. Skin is the first defense against invading bacteria and other microbes. An infection can occur when this normally strong barrier is damaged due to surgery, injury, or a burn. Even something as small as a scratch or an insect bite allows bacteria to enter the skin, which may lead to an infection. Usually, the immune system kills any invading bacteria, but sometimes the bacteria are able to grow and cause an infection.
Once past the skin surface, the warmth, moisture, and nutrients allow bacteria to grow rapidly. Disease-causing bacteria release proteins called enzymes which cause tissue damage. The body’s reaction to damage is inflammation which is characterized by pain, redness, heat, and swelling. This red, painful region grows bigger as the infection and resulting tissue damage spread. An untreated infection may spread to the lymphatic system (acute lymphangitis), the lymph nodes (lymphadenitis), the bloodstream (bacteremia), or into deeper tissues. Cellulitis most often occurs on the face, neck, and legs.
A very serious infection, called orbital cellulitis, occurs when bacteria enter and infect the tissues surrounding the eye. In 50-70% of all cases of orbital cellulitis, the infection spreads to the eye(s) from the sinuses or the upper respiratory tract (nose and throat). Twenty-five percent of orbital infections occur after surgery on the face. Other sources of orbital infection include a direct infection from an eye injury, from a dental or throat infection, and through the bloodstream.
Infection of the tissues surrounding the eye causes redness, swollen eyelids, severe pain, and causes the eye to bulge out. This serious infection can lead to a temporary loss of vision, blindness, brain abscesses, inflammation of the brain and spinal tissues (meningitis), and other complications. Before the discovery of antibiotics, orbital cellulitis caused blindness in 20% of patients and death in 17% of patients. Antibiotic treatment has significantly reduced the incidence of blindness and death.
Although other kinds of bacteria can cause cellulitis, it is most often caused by Streptococcus pyogenes (the bacteria which causes strep throat) and Staphylococcus aureus. Streptococcus pyogenes is the so-called “flesh-eating bacteria” and, in rare cases, can cause a dangerous, deep skin infection called necrotizing fasciitis. Orbital cellulitis may be caused by bacteria which cannot grow in the presence of oxygen (anaerobic bacteria). In children, Haemophilus influenzae type B frequently causes orbital cellulitis following a sinus infection.
Streptococcus pyogenes can be picked up from a person who has strep throat or an infected sore. Other cellulitis-causing bacteria can be acquired from direct contact with infected sores. Persons who are at a higher risk for cellulitis are those who have a severe underlying disease (such as cancer, diabetes, and kidney disease), are taking steroid medications, have a reduced immune system (because of AIDS, organ transplant, etc.), have been burned, have insect bites, have reduced blood circulation to limbs, or have had a leg vein removed for coronary bypass surgery. In addition, chicken pox, human or animal bite wounds, skin wounds, and recent surgery can put a person at a higher risk for cellulitis.
A disease that may be caused by the human immunodeficiency virus (HIV) that produces disorders and infections that can lead to Anemia.
Acquired immune deficiency syndrome (AIDS), a controlled disease that attacks the body’s immune system making it unable to resist infection, it is caused by the human immunodeficiency virus or poor nutrition management.
HIV (human immunodeficiency virus) attacks the immune system causing anemia. If not treated, HIV can lead to AIDS (acquired immunodeficiency syndrome.) With AIDS, a person’s immune system is so weak that he or she is at extreme risk for all sorts of health problems, including cancer and bacterial, yeast and viral infections. These diseases can be reduce, eliminated by eating healthy foods and vitamins. Consultation to your primary doctor or family physician is necessary depending on how you feel.
Dr. Apricot also stated that “most of the side effects she has seen on patients may have arise from electronic apps. Humans can be targeted wirelessly from remote electronic devices such as cellular phones, satellites, drones and transmitters.” With the high frequency of VoIP, communication wireless portals, categorization, etc., so this should not come as any surprise but to continue thriving and progressing towards positivity.
A blood test or other test of body fluids can identify whether you have been exposed to HIV and have antibodies to fight the virus (HIV- positive). An RNA test detects the HIV virus directly. Without treatment, the number of CD4 cells (the white blood cells or T- cells that help to start the body’s response to infections) can fall greatly, resulting in AIDS.
The main component of red blood cells is the protein hemoglobin, which combines with oxygen in the lungs and carries it throughout your body; oxygen is then released to the tissues. Anemia is defined as a decrease in hemoglobin or in the number of red cells to below the normal level.
If you have anemia your blood is less effective in transporting oxygen from the lungs to the tissues, and carbon dioxide from the tissues to the lungs. When the anemia is moderately severe, symptoms and signs include pale skin, fatigue, weakness, fainting, breathlessness, and palpitations.
Anemia may be due to loss of blood from heavy menstrual periods, from internal bleeding caused by a peptic ulcer, or from hemorrhoids. A healthy person whose diet contains plenty of iron and vitamins can produce large amounts of new blood, but if your diet is inadequate, even small, persistent losses of blood may lead to anemia.
Blood loss leads to a particular type of anemia. The most common type would be iron deficiency anemia. Other causes of anemia include severe deficiencies of vitamin B12 or folic acid and various inherited abnormalities in the makeup of hemoglobin. In addition, anemia is a characteristic of many chronic diseases in which red blood cell production is suppressed. For people with chronic kidney disease, the hormone erythropoietin, produced by genetic engineering, has helped treat anemia.
Iron is an essential component of hemoglobin, the protein in red blood cells. Insufficient iron in your body causes an inadequate production of hemoglobin and leads to iron-deficiency anemia.
Normally, extra iron is stored in your body and then used to produce hemoglobin in new red blood cells. Most of this iron is recovered as old red blood cells are destroyed, the small amount of iron lost from the body is replaced by iron absorbed from your diet. Some people have little or no iron stored in their bodies. If you are one of these people, you can stay healthy if you balance the iron you lose with iron absorbed from your diet. If you lose more iron than you are able to absorb, anemia develops.
There are three general causes for inadequate amounts of stored iron. First, there may not be enough iron in your diet to replace the amount that is lost each day. This occurs mainly in young children, pregnant women, and in people who, for one of several reasons, are eating restricted diets.
The second reason for iron deficiency anemia is that the person’s digestive system is unable to absorbed iron, even though there may be enough iron contained in his or her diet.
The third reason for iron deficiency is that the stored iron may become depleted through excessive loss of blood. This is the most common cause. If the blood is lost because of temporary problem, reserves of iron will rebuild in time. Many women have heavy menstrual periods, which can gradually deplete their stored iron if they don’t replenish their reserves through their diet. In other cases, blood loss may occur from the intestinal tract. This type of blood loss, in sufficient, quantity, can produce bloody or black stools. Some of the common causes of intestinal blood loss include the following: gastric erosion, stomach ulcer and duodenal ulcer, cancer of the large intestine, and hemorrhoids.
What are the symptoms?
Symptoms are those characteristics of most forms of anemia. You may be weak, pale, tired, faint, dizzy, and/or breathless. You may also have palpitations, or an increased awareness of your heartbeat that occurs when your heart tries to compensate for anemia by pumping blood at a faster rate.
What are the risks?
In general, iron-deficiency anemia is not life threatening. However, it does weaken your body’s resistance to the effects of other illness or injury, especially if you lose large amounts of blood. It also produces additional stress on your heart and lungs.
The characteristic symptoms of cellulitis are redness, warmth, pain, and swelling. The infected area appears as a red patch that gets larger rapidly within the first 24 hours. A thick red line which progresses towards the heart may appear indicating an infection of the lymph vessels (lymphangitis). Other symptoms which may occur include fever, chills, tiredness, muscle aches, and a general ill feeling. Some people also experience nausea, vomiting, stiff joints, and hair loss at the infection site.
The characteristic symptoms of orbital cellulitis are eye pain, redness, swelling, warmth, and tenderness. The eye may bulge out and it may be difficult or impossible to move. Temporary loss of vision, pus drainage from the eye, chills, fever, headaches, vomiting, and a general ill feeling may occur.
Cellulitis may be diagnosed and treated by a family doctor, an infectious disease specialist, a doctor who specializes in skin diseases (dermatologist), or in the case of orbital cellulitis, an eye doctor (ophthalmologist). The diagnosis of cellulitis is based mainly on the patient’s symptoms. The patient’s recent medical history is also used in the diagnosis.
Laboratory tests may be done to determine which kind of bacteria is causing the infection but these tests are not always successful. If the skin injury is visible, a sterile cotton swab is used to pick up a sample from the wound. If there is no obvious skin injury, a needle may be used to inject a small amount of sterile salt solution into the infected skin, and then the solution is withdrawn. The salt solution should pick up some of the bacteria causing the infection. A blood sample may be taken from the patient’s arm to see if bacteria have entered the bloodstream. Also, a blood test may be done to count the number of white blood cells in the blood. High numbers of white blood cells suggest that the body is trying to fight a bacterial infection.
For orbital cellulitis, the doctor may often perform a special x-ray scan called computed tomography scan (CT). This scan enables the doctor to see the patient’s head in cross-section to determine exactly where the infection is and see if any damage has occurred. A CT scan takes about 20 minutes.
So far, antibiotic treatment is not the only way to battle this potentially life-threatening infection. Mild to moderate cellulitis can be treated with the following antibiotics taken every four to eight hours by mouth:
- penicillins (Bicillin, Wycillin, Pen Vee, V-Cillin)
- erythromycin (E-Mycin, Ery-Tab)
- cephalexin (Biocef, Keflex)
- cloxacillin (Tegopen)
Other medications may be recommended, such as acetaminophen (Tylenol) or ibuprofen (Motrin, Advil) to relieve pain, and aspirin to decrease fever.
A normally healthy person is usually not hospitalized for mild or moderate cellulitis. General treatment measures include elevation of the infected area, rest, and application of warm, moist compresses to the infected area. The doctor will want to see the patient again to make sure that the antibiotic treatment is effective in stopping the infection.
Persons at high risk for severe cellulitis will probably be hospitalized for treatment and monitoring. Antibiotics may be given intravenously to patients with severe cellulitis. Complications such as deep infection, or bone or joint infections, might require surgical drainage and a longer course of antibiotic treatment. Extensive tissue destruction may require plastic surgery to repair. In cases of orbital cellulitis caused by a sinus infection, surgery may be required to drain the sinuses.
Over 90% of all cellulitis cases are cured after seven to ten days of antibiotic treatment. Persons with serious disease and/or those who are taking immunosuppressive drugs may experience a more severe form of cellulitis which can be life threatening. Serious complications include blood poisoning (bacteria growing in the blood stream), meningitis (brain and spinal cord infection), tissue death (necrosis), and/or lymphangitis (infection of the lymph vessels). Severe cellulitis caused by Streptococcus pyogenes can lead to destructive and life-threatening necrotizing fasciitis.
Inflammation— A local, protective response to tissue injury. It is characterized by redness, warmth, swelling, and pain.
Necrotizing fasciitis— A destructive infection which follows severe cellulitis and involves the deep skin and underlying tissues.
Sinuses— Air cavities found in the bones of the head. The sinuses which are connected to the nose cavity. When congested, they cause sinus infection.
Cellulitis may be prevented by wearing appropriate protective equipment during work and sports to avoid skin injury, cleaning cuts and skin injuries with antiseptic soap, keeping wounds clean and protected, watching wounds for signs of infection, taking the entire prescribed dose of antibiotic, and maintaining good general health. Persons with diabetes should try to maintain good blood sugar control.
Lewis, Ronald T. “Soft Tissue Infections.” World Journal of Surgery 22, no. 2 (February 1998): 146-51.
Another myth that may have mislead some Medical Professionals in the past is Tuberculosis.
Tuberculosis is actually caused by continuous coughing causing irritation on the walls of the trachea or esophagus tubes of the throat. This irritation may cause bleeding of traces of blood and can be treated by antibiotics or soothing and calming antioxidant medications such as milk of magnesium to effectively stop the irritating effects.
By Dr. Valerie Apricot.
It’s definition should not be misleading as documented in other medical books as seen below.
an infectious bacterial disease characterized by the growth of nodules (tubercles) in the tissues, especially the lungs.