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Saliva
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This article is about the substance produced in the mouth. For other uses, see Saliva (disambiguation).
Not to be confused with Salvia.
Saliva is a watery substance formed in the mouths of animals, secreted by the salivary glands. Human saliva comprises 99.5% water, plus electrolytes, mucus, white blood cells, epithelial cells (which can be used to extract DNA), glycoproteins, enzymes (such as amylase and lipase), antimicrobial agents such as secretory IgA and lysozyme.[1] The enzymes found in saliva are essential in beginning the process of digestion of dietary starches and fats. These enzymes also play a role in breaking down food particles entrapped within dental crevices, thus protecting teeth from bacterial decay.[2] Furthermore, saliva serves a lubricative function, wetting food and permitting the initiation of swallowing, and protecting the mucosal surfaces of the oral cavity from desiccation.[3]
Various animal species have special uses for saliva that go beyond pre-digestion. Some swifts use their gummy saliva to build nests. Aerodramus nests form the basis of bird's nest soup.[4] Cobras, vipers, and certain other members of the venom clade hunt with venomous saliva injected by fangs. Some caterpillars, produce silk fiber from salivary glands.[citation needed]
Contents
[hide]
1 Contents
2 Daily salivary output
3 Functions
3.1 Lubricant
3.2 Digestion
3.3 Role in taste
3.4 Other
4 Production
5 Behaviour
5.1 Spitting
5.2 Glue to construct bird nests
5.3 Wound licking
6 Substitutes
7 See also
8 References
9 Further reading
10 External links
Contents[edit]
Produced in salivary glands, human saliva is 99.5% water, but also contains many important substances, including electrolytes, mucus, antibacterial compounds and various enzymes.[1]
Water: 99.5%
Electrolytes:
2–21 mmol/L sodium (lower than blood plasma)
10–36 mmol/L potassium (higher than plasma)
1.2–2.8 mmol/L calcium (similar to plasma)
0.08–0.5 mmol/L magnesium
5–40 mmol/L chloride (lower than plasma)
25 mmol/L bicarbonate (higher than plasma)
1.4–39 mmol/L phosphate
Iodine (mmol/L concentration is usually higher than plasma, but dependent variable according to dietary iodine intake)
Mucus (mucus in saliva mainly consists of mucopolysaccharides and glycoproteins)
Antibacterial compounds (thiocyanate, hydrogen peroxide, and secretory immunoglobulin A)
Epidermal growth factor (EGF)
Various enzymes; there are three major enzymes found in saliva:
α-amylase (EC3.2.1.1), or ptyalin, secreted by the acinar cells of the parotid and submandibular glands, starts the digestion of starch before the food is even swallowed; it has a pH optimum of 7.4
Lingual lipase, which is secreted by the acinar cells of the sublingual gland; has a pH optimum around 4.0 so it is not activated until entering the acidic environment of the stomach
Kallikrein, an enzyme that proteolytically cleaves high-molecular-weight kininogen to produce bradykinin, which is a vasodilator; it is secreted by the acinar cells of all three major salivary glands
Antimicrobial enzymes that kill bacteria
Lysozyme
Salivary lactoperoxidase
Lactoferrin[5]
Immunoglobulin A[5]
Proline-rich proteins (function in enamel formation, Ca2+-binding, microbe killing and lubrication)[5]
Minor enzymes include salivary acid phosphatases A+B, N-acetylmuramoyl-L-alanine amidase, NAD(P)H dehydrogenase (quinone), superoxide dismutase, glutathione transferase, class 3 aldehyde dehydrogenase, glucose-6-phosphate isomerase, and tissue kallikrein (function unknown)[5]
Cells: possibly as many as 8 million human and 500 million bacterial cells per mL. The presence of bacterial products (small organic acids, amines, and thiols) causes saliva to sometimes exhibit foul odor
Opiorphin, a pain-killing substance found in human saliva
Haptocorrin, a protein which binds to Vitamin B12 to protect it against degradation in the stomach, before it binds to intrinsic factor
Daily salivary output[edit]
There is much debate about the amount of saliva that is produced in a healthy person per day; estimates range from 0.75 to 1.5 litres per day while it is generally accepted that during sleep the amount drops to nearly zero.[3][6] In humans, the submandibular gland contributes around 70–75% of secretion, while the parotid gland secretes about 20–25% and small amounts are secreted from the other salivary glands.
Functions[edit]
Saliva contributes to the digestion of food and to the maintenance of oral hygiene. Without normal salivary function the frequency of dental caries, gum disease (gingivitis and periodontitis), and other oral problems increases significantly.[citation needed]
Lubricant[edit]
Saliva coats the oral mucosa, mechanically protecting it from trauma during eating, swallowing and speaking. In people with little saliva (xerostomia), soreness of the mouth is very common, and the food (especially dry food) sticks to the inside of the mouth.
Digestion[edit]
The digestive functions of saliva include moistening food and helping to create a food bolus. This lubricative function of saliva allows the food bolus to be passed easily from the mouth into the esophagus. Saliva contains the enzyme amylase, also called ptyalin, which is capable of breaking down starch into simpler sugars such as maltose and dextrin that can be further broken down in the small intestine. Only about 30% starch digestion takes place in the mouth cavity. Salivary glands also secrete salivary lipase (a more potent form of lipase) to begin fat digestion. Salivary lipase plays a large role in fat digestion in newborn infants as their pancreatic lipase still needs some time to develop.[7]
Role in taste[edit]
Saliva is very important in the sense of taste. It is the liquid medium in which chemicals are carried to taste receptor cells (mostly associated with lingual papillae). Persons with little saliva often complain of dysgeusia (i.e. disordered taste, e.g. reduced ability to taste, or having a bad, metallic taste at all times).
Other[edit]
Saliva maintains the pH of the mouth. Saliva is supersaturated with various ions. Certain salivary proteins prevent precipitation, which would form salts. These ions act as a buffer, keeping the acidity of the mouth within a certain range, typically pH 6.2–7.4. This prevents minerals in the dental hard tissues from dissolving.
Saliva secretes carbonic anhydrase (gustin), which is thought to play a role in the development of taste buds.[8]
Saliva contains EGF. EGF results in cellular proliferation, differentiation, and survival.[9] EGF is a low-molecular-weight polypeptide first purified from the mouse submandibular gland, but since then found in many human tissues including submandibular gland, parotid gland. Salivary EGF, which seems also regulated by dietary inorganic iodine, also plays an important physiological role in the maintenance of oro-esophageal and gastric tissue integrity. The biological effects of salivary EGF include healing of oral and gastroesophageal ulcers, inhibition of gastric acid secretion, stimulation of DNA synthesis as well as mucosal protection from intraluminal injurious factors such as gastric acid, bile acids, pepsin, and trypsin and to physical, chemical and bacterial agents.[10]
Production[edit]
The production of saliva is stimulated both by the sympathetic nervous system and the parasympathetic.[11]
The saliva stimulated by sympathetic innervation is thicker, and saliva stimulated parasympathetically is more watery.
Sympathetic stimulation of saliva is to facilitate respiration, whereas parasympathetic stimulation is to facilitate digestion.
Parasympathetic stimulation leads to acetylcholine (ACh) release onto the salivary acinar cells. ACh binds to muscarinic receptors, specifically M3, and causes an increased intracellular calcium ion concentration (through the IP3/DAG second messenger system). Increased calcium causes vesicles within the cells to fuse with the apical cell membrane leading to secretion. ACh also causes the salivary gland to release kallikrein, an enzyme that converts kininogen to lysyl-bradykinin. Lysyl-bradykinin acts upon blood vessels and capillaries of the salivary gland to generate vasodilation and increased capillary permeability respectively. The resulting increased blood flow to the acini allows production of more saliva. In addition, Substance P can bind to Tachykinin NK-1 receptors leading to increased intracellular calcium concentrations and subsequently increased saliva secretion. Lastly, both parasympathetic and sympathetic nervous stimulation can lead to myoepithelium contraction which causes the expulsion of secretions from the secretory acinus into the ducts and eventually to the oral cavity.
Sympathetic stimulation results in the release of norepinephrine. Norepinephrine binding to α-adrenergic receptors will cause an increase in intracellular calcium levels leading to more fluid vs. protein secretion. If norepinephrine binds β-adrenergic receptors, it will result in more protein or enzyme secretion vs. fluid secretion. Stimulation by norepinephrine initially decreases blood flow to the salivary glands due to constriction of blood vessels but this effect is overtaken by vasodilation caused by various local vasodilators.
Saliva production may also be pharmacologically stimulated by so-called sialagogues. It can also be suppressed by so-called antisialagogues.
A building being renovated in the Carrollton section of New Orleans
Behaviour[edit]
Spitting[edit]
Spitting is the act of forcibly ejecting saliva or other substances from the mouth. It is often considered rude and a social taboo in many parts of the world, including Western countries, where it is frequently forbidden by local laws (as it was thought to facilitate the spread of disease). These laws are generally not strictly enforced. In Singapore, the fine for spitting may be as high as SGD$2,000 for multiple offenses, and one can even be arrested. In some other parts of the world, expectoration is more socially acceptable (even if officially disapproved of or illegal), and spittoons are still a common appearance in some cultures. Some animals, including humans in some cases, use spitting as an automatic defensive move. Camels are well known for doing this, though most domestic camels are trained not to.
Glue to construct bird nests[edit]
Many birds in the swift family, Apodidae, produce a viscous saliva during nesting season to glue together materials to construct a nest.[12] Two species of swifts in the genus Aerodramus build their nests using only their saliva, the base for bird's nest soup.[13]
Wound licking[edit]
Main article: Wound licking
A common belief is that saliva contained in the mouth has natural disinfectants, which leads people to believe it is beneficial to "lick their wounds". Researchers at the University of Florida at Gainesville have discovered a protein called nerve growth factor (NGF) in the saliva of mice. Wounds doused with NGF healed twice as fast as untreated and unlicked wounds; therefore, saliva can help to heal wounds in some species. NGF has not been found in human saliva; however, researchers find human saliva contains such antibacterial agents as secretory IgA, lactoferrin, lysozyme and peroxidase.[14] It has not been shown that human licking of wounds disinfects them, but licking is likely to help clean the wound by removing larger contaminants such as dirt and may help to directly remove infective bodies by brushing them away. Therefore, licking would be a way of wiping off pathogens, useful if clean water is not available to the animal or person.
Substitutes[edit]
A number of commercially available saliva substitutes exist.[15]
See also[edit]
Spittle cures
References[edit]
^ Jump up to: a b Physiology: 6/6ch4/s6ch4_6 - Essentials of Human Physiology
Jump up ^ Fejerskov, O.; Kidd, E. (2007). Dental Caries: The Disease and Its Clinical Management (2nd ed.). Wiley-Blackwell. ISBN 978-1-4051-3889-5.
^ Jump up to: a b Edgar, M.; Dawes, C.; O'Mullane, D. (2004). Saliva and Oral Health (3rd ed.). British Dental Association. ISBN 0-904588-87-4.
Jump up ^ Marcone, Massimo F. (2005). "Characterization of the edible bird's nest the "Caviar of the East"". Food Research International. 38 (10): 1125–1134. doi:10.1016/j.foodres.2005.02.008. Retrieved 2014-04-17.
^ Jump up to: a b c d Boron, Walter F. (2003). Medical Physiology: A Cellular And Molecular Approach. Elsevier/Saunders. p. 928. ISBN 1-4160-2328-3.
Jump up ^ Dawes, C. (1972). "Circadian rhythms in human salivary flow rate and composition". Journal of Physiology. 220 (3): 529–545. PMC 1331668  . PMID 5016036.
Jump up ^ Maton, Anthea (1993). Human Biology and Health. Prentice Hall. ISBN 0-13-981176-1.
Jump up ^ Manuel Ramos-Casals; Haralampos M. Moutsopoulos; John H. Stone. Sjogren's syndrome: Diagnosis and Therapeutics. Springer, 2011. p. 522.
Jump up ^ Herbst RS (2004). "Review of epidermal growth factor receptor biology". International Journal of Radiation Oncology, Biology, Physics. 59 (2 Suppl): 21–6. PMID 15142631. doi:10.1016/j.ijrobp.2003.11.041.
Jump up ^ Venturi S, Venturi M (2009). "Iodine in evolution of salivary glands and in oral health". Nutrition and Health. 20 (2): 119–134. PMID 19835108. doi:10.1177/026010600902000204.
Jump up ^ Physiology: 6/6ch4/s6ch4_7 - Essentials of Human Physiology
Jump up ^ Ramel, Gordon, "Digestion", The Amazing World of Birds, Earthlife Web, retrieved 2012-07-29
Jump up ^ "Swiftlet". 2011-12-27. Retrieved 2012-07-29.
Jump up ^ Jorma (2002). "Antimicrobial Agents in Saliva—Protection for the Whole Body". Journal of Dental Research. 81 (12): 807–809.
Jump up ^ Myers, Eugene N.; Ferris, Robert L. (2007). Salivary Gland Disorders. Springer Science & Business Media. p. 191. ISBN 9783540470724.
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2011) (Learn how and when to remove this template message)
Further reading[edit]
Bahar, G.; Feinmesser, R.; Shpitzer, T.; Popovtzer, A.; Nagler, R. M. (2007). "Salivary analysis in oral cancer patients: DNA and protein oxidation, reactive nitrogen species, and antioxidant profile". Cancer. 109 (1): 54–59. PMID 17099862. doi:10.1002/cncr.22386.
Banerjee, R. K.; Bose, A. K.; Chakraborty, T. K.; De, S. K.; Datta, A. G. (1985). "Peroxidase-catalysed iodotyrosine formation in dispersed cells of mouse extrathyroidal tissues". J Endocrinol. 106 (2): 159–165. PMID 2991413. doi:10.1677/joe.0.1060159.
Banerjee, R. K.; Datta, A. G. (1986). "Salivary peroxidases". Mol Cell Biochem. 70 (1): 21–29. PMID 3520291. doi:10.1007/bf00233801.
Bartelstone, H. J. (1951). "Radioiodine penetration through intact enamel with uptake by bloodstream and thyroid gland". J Dent Res. 30 (5): 728–733. PMID 14888774. doi:10.1177/00220345510300051601.
Bartelstone, H. J.; Mandel, I. D.; Oshry, E.; Seildlin, S. M. (1947). "Use of radioactive iodine as a tracer in the Study of the Physiology of teeth". Science. 106 (2745): 132. doi:10.1126/science.106.2745.132-a.
Edgar, M.; Dawes, C.; O'Mullane, D. (2004). Saliva and Oral Health (3rd ed.). British Dental Association. ISBN 0-904588-87-4.
External links[edit]
Wikimedia Commons has media related to Saliva.
The dictionary definition of saliva at Wiktionary
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