A cell in the immune system.
Macrophages are large phagocytes, which can engulf and destroy microorganisms and other foreign particles.
They are found in most body tissues.
Macrophages are large phagocytes, which can engulf and destroy microorganisms and other foreign particles.
They are found in most body tissues.
The cause is thought to be bacterial; affected tissues are found to contain macrophages (a type of scavenging cell) containing rod-shaped bacteria. Treatment is with antibiotic drugs for at least 1 year. Dietary supplements are used to correct nutritional deficiencies occurring as a result of malabsorption.... whipple’s disease
Habitat: Cultivated throughout India, wild on coasts of Maharashtra, Gujarat and South India.
English: Curacao Aloe, Barbados Aloe, Indian Aloe, Jaffarabad Aloe.Ayurvedic: Kanyaasaara, Eleyaka (dried juice of the leaves). Kumaari, Kumaarikaa, Kanyaa, Grihkanyaa, Ghritkumaarika (plant).Unani: Gheekwaar, Sibr.Siddha/Tamil: Sotru Kattraazhai, Kumaari. Moosaambaram (dried juice).Folk: Elwaa, Musabbar (dried juice of leaves).Action: Purgative (causes griping), emmenagogue. Gel—topically emollient, anti-inflammatory, antimicrobial (used for wound healing, sunburn).
Key application: In occasional constipation; contraindicated in intestinal obstruction and acutely inflamed intestinal diseases, ulcerative colitis, appendicitis. (German Commission E, ESCOP, WHO.)The Ayurvedic Pharmacopoeia of India recommends the use of dried juice of leaves in dysmenorrhoea and diseases of the liver.Aloe vera improved the hypoglycaemic effect of glyburide (gliben- clamide) when one tablespoonful aloe juice was given orally in the morning and at bedtime to 36 diabetic patients for 42 days. The juice (same dose) showed antihyperglycaemic activity (independently). (Francis Brinker.)Anthraquinone glycosides, known as aloin, in small doses act as a tonic to the digestive system, and at higher doses become a strong purgative, as well as increase colonic secretions and peristaltic contractions. Resin fraction is also as important as aloin in cathartic action. In A. barbadensis the highest percentage of aloin is 21.8%.Aloe produces pelvic congestion and is used for uterine disorders, generally with Fe and carminatives. The pulp is used in menstrual suppressions.A molecule in the Aloe vera gel, ace- mannan, stimulates macrophages and releases immune system potentiators; enhances function of T cells and interferon production. Animal studies have shown promising results in sarcoma.The carboxypeptidase and salicylate components of Aloe gel can inhibit bradykinin, a pain-producing agent; C-glycosyl chromone appears to reduce topical inflammation. Aloe gel also slows or inhibits the synthesis of thromboxane, which may accelerate the healing of burns. (Natural Medicines Comprehensive Database, 2007.)Dosage: Leaf pulp juice—10-20 ml. (CCRAS.) Dried leaf pulp juice— 125-500 mg powder. (API Vol. I.)... aloe barbadensisHabitat: Throughout India, from Himachal Pradesh to Assam and Mizoram, and all over southern India.
English: Creat.Ayurvedic: Kaalmegha, Bhuunimba, Bhuuminimbaka, Vishwambharaa, Yavtikta, Kalpanaatha, Kiraata-tikta (var.).Unani: Kiryaat.Siddha/Tamil: Nilavembu.Action: Hepatoprotective, cholin- ergic, antispasmodic, stomachic, anthelmintic, alterative, blood purifier, febrifuge. It acts well on the liver, promoting secretion of bile. Used in jaundice and torpid liver, flatulence and diarrhoea of children, colic, strangulation of intestines and splenomegaly; also for cold and upper respiratory tract infections.
Key application: As bitter tonic, febrifuge and hepatoprotective. (Indian Herbal Pharmacopoeia.)Kaalmegha, officinal in IP, consists of dried leaves and tender shoots, which yield not less than 1% andro- grapholide on dry-weight basis.Several active constituents have been identified from the leaf and rhizome, including andrographolide, deoxyan- drographolide and other diterpenes.Andrographolide exhibited strong choleretic action when administered i.p. to rats. It induces increase in bile flow together with change in physical properties of bile secretion. It was found to be more potent than sily- marin.Andrographolide was found to be almost devoid of antihepatitis-B virus surface antigen-like activity (when compared with picroliv.)The leaf and stem extracts of Kaal- megha/andrographolide given s.c. or orally did not change blood sugar level of normal or diabetic rats.Alcoholic extract of the plant exhibited antidiarrhoeal activity against E. coli enterotoxins in animal models.Clinical evidence of effectiveness of andrographis in humans is limited to the common cold. Preliminary evidence suggests that it might increase antibody activity and phagocytosis by macrophages, and might have mast cell-stabilizing and antiallergy activity. (Natural Medicines Comprehensive Database, 2007.)The herb is contraindicated inbleed- ing disorders, hypotension, as well as male and female sterility (exhibited infertility in laboratory animals).Dosage: Whole plant—5-10 ml juice; 50-100 ml decotion; 1-3 g powder. (CCRAS.)... andrographis panicultataAction: Oxytocic, abortifacient, emmenagogue.
Aristolochic acid and its Me es- ter—strongly abortifacient, showed damage to liver and kidney. Roots— anti-oestrogenic. A cytotoxic lignan, savinin, has been isolated from the roots.Aristolochic acid also has an effect against adenosarcoma and HeLa cells in culture; however, it is suspected to be carcinogenic.Aristolochia extracts show a pronounced enhancement of phagocytosis by leucocytes, granulocytes and peritoneal macrophages, due to the presence of aristolochic acids.Tardolyt-coated tablets, which contain 0.3 mg of aristolochic acid, increase phagocytosis in healthy men.Aristolochic acid also exhibits reduction of some of the toxic effects of prednisolone, chloramphenicol and tetracycline in experiments in vitro, and a reduction in the rate of recurrent herpes lesions in vivo.... aristolochia longaGranulocytes Also known as polymorphonuclear leucocytes (‘polys’), these normally constitute 70 per cent of the white blood cells. They are divided into three groups according to the staining reactions of these granules: neutrophils, which stain with neutral dyes and constitute 65–70 per cent of all the white blood cells; eosinophils, which stain with acid dyes (e.g. eosin) and constitute 3–4 per cent of the total white blood cells; and basophils, which stain with basic dyes (e.g. methylene blue) and constitute about 0·5 per cent of the total white blood cells.
Lymphocytes constitute 25–30 per cent of the white blood cells. They have a clear, non-granular cytoplasm and a relatively large nucleus which is only slightly indented. They are divided into two groups: small lymphocytes, which are slightly larger than erythrocytes (about 8 micrometres in diameter); and large lymphocytes, which are about 12 micrometres in diameter.
Monocytes Motile phagocytic cells that circulate in the blood and migrate into the tissues, where they develop into various forms of MACROPHAGE such as tissue macrophages and KUPFFER CELLS.
Site of origin The granulocytes are formed in the red BONE MARROW. The lymphocytes are formed predominantly in LYMPHOID TISSUE. There is some controversy as to the site of origin of monocytes: some say they arise from lymphocytes, whilst others contend that they are derived from histiocytes – i.e. the RETICULO-ENDOTHELIAL SYSTEM.
Function The leucocytes constitute one of the most important of the defence mechanisms against infection. This applies particularly to the neutrophil leucocytes (see LEUCOCYTOSIS). (See also ABSCESS; BLOOD – Composition; INFLAMMATION; PHAGOCYTOSIS; WOUNDS.)... leucocytes
A target cell is also a cell that is the focus of attack by macrophages (killer cells – see MACROPHAGE) or ANTIBODIES; it may also be the site of action of a speci?c hormone (see HORMONES).... target cell
Causes The cause of fever is the release of fever-producing proteins (pyrogens) by phagocytic cells called monocytes and macrophages, in response to a variety of infectious, immunological and neoplastic stimuli. The lymphocytes (see LYMPHOCYTE) play a part in fever production because they recognise the antigen and release substances called lymphokines which promote the production of endogenous pyrogen. The pyrogen then acts on the thermoregulatory centre in the HYPOTHALAMUS and this results in an increase in heat generation and a reduction in heat loss, resulting in a rise in body temperature.
The average temperature of the body in health ranges from 36·9 to 37·5 °C (98·4 to 99·5 °F). It is liable to slight variations from such causes as the ingestion of food, the amount of exercise, the menstrual cycle, and the temperature of the surrounding atmosphere. There are, moreover, certain appreciable daily variations, the lowest temperature being between the hours of 01.00 and 07.00 hours, and the highest between 16.00 and 21.00 hours, with tri?ing ?uctuations during these periods.
The development and maintenance of heat within the body depends upon the metabolic oxidation consequent on the changes continually taking place in the processes of nutrition. In health, this constant tissue disintegration is exactly counterbalanced by the consumption of food, whilst the uniform normal temperature is maintained by the adjustment of the heat developed, and of the processes of exhalation and cooling which take place, especially from the lungs and skin. During a fever this balance breaks down, the tissue waste being greatly in excess of the food supply. The body wastes rapidly, the loss to the system being chie?y in the form of nitrogen compounds (e.g. urea). In the early stage of fever a patient excretes about three times the amount of urea that he or she would excrete on the same diet when in health.
Fever is measured by how high the temperature rises above normal. At 41.1 °C (106 °F) the patient is in a dangerous state of hyperpyrexia (abnormally high temperature). If this persists for very long, the patient usually dies.
The body’s temperature will also rise if exposed for too long to a high ambient temperature. (See HEAT STROKE.)
Symptoms The onset of a fever is usually marked by a RIGOR, or shivering. The skin feels hot and dry, and the raised temperature will often be found to show daily variations – namely, an evening rise and a morning fall.
There is a relative increase in the pulse and breathing rates. The tongue is dry and furred; the thirst is intense, while the appetite is gone; the urine is scanty, of high speci?c gravity and containing a large quantity of solid matter, particularly urea. The patient will have a headache and sometimes nausea, and children may develop convulsions (see FEBRILE CONVULSION).
The fever falls by the occurrence of a CRISIS – that is, a sudden termination of the symptoms – or by a more gradual subsidence of the temperature, technically termed a lysis. If death ensues, this is due to failure of the vital centres in the brain or of the heart, as a result of either the infection or hyperpyrexia.
Treatment Fever is a symptom, and the correct treatment is therefore that of the underlying condition. Occasionally, however, it is also necessary to reduce the temperature by more direct methods: physical cooling by, for example, tepid sponging, and the use of antipyretic drugs such as aspirin or paracetamol.... fever
Habitat: Native of Europe; grown in Jammu & Kashmir, Himachal Pradesh and Uttar Pradesh.
English: German Chamomile, Chamomile. German chamomile flower is equated with Matricaria recutita L. (synonym Chamomilla recutita L.) and Roman Chamomile flower with Anthemis nobilis L. (synonym Chamamaelum nobilis L.)Unani: Baabunaa.Action: Sedative, anticonvulsant, carminative, antispasmodic, analgesic, anti-inflammatory, antiseptic. See also Anthemis nobilis.
Key application (German Chamomile) ? In inflammatory diseases of the gastrointestinal tract and gastrointestinal spasm. Externally, in skin, mucous membrane and ano-genital inflammation and bacterial skin diseases. (German Commission E, The British Herbal Compendium.) As anti-inflammatory and anti- spasmodic. (The British Herbal Pharmacopoeia.)The flowers of German chamomile gave volatile oil up to about 2%, containing alpha-bisabolol up to 50%, azu- lenes including chamazulene, guiazu- line and matricine; flavonoids including apigenin and luteolin and their glycosides, patuletin and quercetin; spiroethers; coumarins; polysaccha- rides.The flowers are used as herbal tea for cough and cold and for promoting the flow of gastric secretion and bile. In chamomlile extracts, chamazulene has been found responsible for anti- inflammatory activity. Matricine and (-)-alpha-bisabolol also show anti- inflammatory and analgesic activity. Bisabolol exhibits ulceroprotective effect. Natural (-)-alpha-bisabolol has been shown to be significantly effective in healing burns; (-)-alpha-bisabolol, spiroethers and apigenin exhibit spasmolytic effect comparable with that of papaverine.The polysaccharides are immunos- timulating and activate macrophages and B lymphocytes; play an important role in wound healing.Crude aqueous extract of the plant has been reported to significantly delay the onset of convulsions and reduce mortality rate produced by picrotoxin experimentally.... matricaria chamomillamacro- A prefix meaning large, as in macrophage (a large cell in the immune system) or macroglossia.... lysozyme
Habitat: Native to tropical America; introduced into Indian gardens.
Action: Leaves and branch tips— a decoction is used in rheumatism; also for whooping cough and respiratory problems.
Solvent extracts of the leaves (etha- nol, acetone and M-hexane) were found active against Gram-positive bacteria.Synonym: W. viridiflora Meissn. W. indica var. virdiflora Hook. f.Family: Thymelaeaceae.Habitat: Eastern Assam; as a weed in Tamil Nadu.
English: Small-Leaf Salago.Folk: Salago.Action: Root bark—diuretic, vesicant, purgative and piscicidal.
The root bark is reported to contain a flavone glycoside, wikstroemin, which exhibited diuretic activity.In Chinese folk medicine, the bark is used for schistosomiasis.The stem contains wikstromol, a lig- nin prototype which exhibited anti- neoplastic activity. Daphnoretin, isolated from the plant, caused platelet aggregation in the blood of rabbits. A polysaccharide, comprising glucose, arabinose, galacturonic acid, galactose and xylose, protected mice against radiation and enhanced the formation of macrophages.... wigandia caracasanaWhen haemolysis is due to a defect inside the red cells, the underlying problem is abnormal rigidity of the cell membrane. This causes the cells to become trapped, at an early stage of their life-span, in the small blood vessels of the spleen, where they are destroyed by macrophages (cells that ingest foreign particles). Abnormal rigidity may result from an inherited defect of the cell membrane (as in hereditary spherocytosis), a defect of the haemoglobin in the cell (as in sickle-cell anaemia), or a defect of one of the cell’s enzymes. An inherited deficiency of the glucose-6phosphate dehydrogenase enzyme (see G6PD deficiency) may result in episodes of haemolytic anaemia since the red cells are prone to damage by infectious illness or certain drugs or foods.
Haemolytic anaemias due to defects outside the red cells fall into 3 main groups. First are disorders in which red cells are destroyed by buffeting (by artificial surfaces such as replacement heart valves, abnormal blood-vessel linings, or a blood clot in a vessel, for example). In the 2nd group, the red cells are destroyed by the immune system. Immune haemolytic anaemias may occur if foreign blood cells enter the bloodstream, as occurs in an incompatible blood transfusion, or they may be due to an autoimmune disorder. In haemolytic disease of the newborn, the baby’s red cells are destroyed by the mother’s antibodies crossing the placenta. Thirdly, the red cells may be destroyed by microorganisms; the most common cause is malaria. People with haemolytic anaemia may have symptoms common to all types of anaemia, such as fatigue and breathlessness, or symptoms specifically due to haemolysis, such as jaundice.
Diagnosis is made by examination of the blood (see blood film). Some inherited anaemias can be controlled by removing the spleen (see splenectomy). Others, such as G6PD deficiency, can be prevented by avoiding the drugs or foods that precipitate haemolysis. Anaemias due to immune processes can often be controlled by immunosuppressant drugs. Transfusions of red cells are sometimes needed for emergency treatment of life-threatening anaemia.... anaemia, haemolytic
A lymph node consists of a thin, fibrous outer capsule and an inner mass of lymphoid tissue. Penetrating the capsule are several small lymphatic vessels (whichcarry lymph into the node). Each node contains sinuses (spaces), in which the lymph is filtered. The flow of the lymph slows as it moves through narrow channels in the sinuses; this reduction in flow allows macrophages (white blood cells that engulf and destroy foreign and dead material) time to filter microorganisms from the lymph. Germinal centres in the lymph node release white blood cells called lymphocytes, which also help to fight infection. A single, larger vessel carries lymph out of the node.... lymph node
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