Inositol

Source: Wikipedia, the free encyclopedia.
myo-Inositol[1]
myo-Inositol
myo-Inositol
Names
IUPAC name
myo-Inositol
Systematic IUPAC name
(1R,2S,3r,4R,5S,6s)-Cyclohexane-1,2,3,4,5,6-hexol
Other names
cis-1,2,3,5-trans-4,6-Cyclohexanehexol
Cyclohexanehexol
Mouse antialopecia factor
Nucite
Phaseomannite
Phaseomannitol
Rat antispectacled eye factor
Scyllite (for the isomer scyllo-inositol)
Vitamin B8
Identifiers
3D model (
JSmol
)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard
 100.027.295 Edit this at Wikidata
IUPHAR/BPS
KEGG
UNII
  • InChI=1S/C6H12O6/c7-1-2(8)4(10)6(12)5(11)3(1)9/h1-12H/t1-,2-,3-,4+,5-,6- checkY
    Key: CDAISMWEOUEBRE-GPIVLXJGSA-N checkY
  • InChI=1/C6H12O6/c7-1-2(8)4(10)6(12)5(11)3(1)9/h1-12H/t1-,2-,3-,4+,5-,6-
    Key: CDAISMWEOUEBRE-GPIVLXJGBG
  • O[C@@H]1[C@@H](O)[C@H](O)[C@H](O)[C@H](O)[C@H]1O
Properties
C6H12O6
Molar mass 180.16 g/mol
Density 1.752 g/cm3
Melting point 225 to 227 °C (437 to 441 °F; 498 to 500 K)
Pharmacology
A11HA07 (WHO)
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
0
0
Flash point 143 °C (289 °F; 416 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Inositol, primarily the

neurotransmitters, and growth factors and participates in osmoregulation.[2] Concerning regulation of osmosis, in most mammalian cells the intracellular concentrations of myo-inositol are 5 to 500 times greater than the extracellular concentrations.[3]

It is a

steroid hormones bind to their receptors.[5]

Inositol is promoted as a dietary supplement in the management of polycystic ovary syndrome (PCOS). However, there is only evidence of very low quality for its efficacy in increasing fertility for IVF in women with PCOS.[6]

Overview

myo-Inositol plays an important role as the structural basis for a number of

secondary messengers in eukaryotic cells, the various inositol phosphates. In addition, inositol serves as an important component of the structural lipids phosphatidylinositol (PI) and its various phosphates, the phosphatidylinositol phosphate
(PIP) lipids.

Inositol or its phosphates and associated lipids are found in many foods, in particular fruit, especially cantaloupe and oranges.[7] In plants, the hexaphosphate of inositol, phytic acid or its salts, the phytates, serve as phosphate stores in seed, for example in nuts and beans.[8] Phytic acid also occurs in cereals with high bran content. Phytate is, however, not directly bioavailable to humans in the diet, since it is not digestible. Some food preparation techniques partly break down phytates to change this. However, inositol in the form of glycerophospholipids, as found in certain plant-derived substances such as lecithins, is well absorbed and relatively bioavailable.

myo-Inositol (free of phosphate) was once considered a member of the

essential nutrient.[9]

Isomers and structure

myo-Inositol is the biologically important form of cyclohexane-1,2,3,4,5,6-hexol. It is a

enantiomers (mirror-image forms). All the others are meso compounds.[10]

myo- scyllo- muco- chiro-
neo- allo- epi- cis-

In its most stable

axial.[11]

Biosynthesis

In humans, myo-Inositol is

IMPA1) to give free myo-inositol. In humans, most inositol is synthesized in the kidneys, followed by testicles, typically in amounts of a few grams per day.[2]

At the peripheral level, myo-inositol is converted to D-chiro-inositol by a specific epimerase. Only a minor fraction of myo-inositol is converted into D-chiro-inositol.[3] The activity of this epimerase is insulin dependent, causing a reduction of D-chiro-inositol in muscle, fat, and liver when there is insulin resistance.[12][3] D-chiro-inositol reduces the conversion of testosterone to estrogen, thereby increases the levels of testosterone and worsening PCOS.[3]

Phytic acid in plants

2D-structure of phytic acid
Inositolhexaphosphate, or phytic acid

Inositol hexaphosphate, also called

developing countries.[15][16]

Inositol penta- (IP5), tetra- (IP4), and triphosphate (IP3) are also called "phytates".

Biological function

Inositol, phosphatidylinositol and some of their mono- and polyphosphates function as secondary messengers in a number of intracellular signal transduction pathways. They are involved in a number of biological processes, including:

In one important family of pathways, phosphatidylinositol 4,5-bisphosphate (PIP2) is stored in cellular membranes until it is released by any of a number of signalling proteins and transformed into various secondary messengers, for example diacylglycerol and inositol triphosphate.[23]

Industrial uses

Explosives industry

At the 1936 meeting of the American Chemical Society, professor Edward Bartow of the University of Iowa presented a commercially viable means of extracting large amounts of inositol from the phytic acid naturally present in waste corn. As a possible use for the chemical, he suggested 'inositol nitrate' as a more stable alternative to nitroglycerin.[24] Today, inositol nitrate is used to gelatinize nitrocellulose in many modern explosives and solid rocket propellants.[25]

Road salt

When plants are exposed to increasing concentrations of

road salt, the plant cells become dysfunctional and undergo apoptosis, leading to inhibited growth. Inositol pretreatment could reverse these effects.[26]

Research and clinical applications

Psychiatry

Depression

Large doses of inositol have been studied for treatment of depression, but further study is needed to determine whether this is an effective treatment.[27]

Panic disorder and obsessive-compulsive disorder

Inositol has been found to have modest to moderate effects in patients with

obsessive-compulsive disorder.[28][29]

Trichotillomania

High doses of inositol are sometimes used to treat trichotillomania (compulsive hair-pulling) and related disorders,[30] but a small (N=38) double-blinded placebo-controlled trial did not find a statistically significant improvement with inositol.[31]

Other illnesses

D-chiro-inositol is an important messenger molecule in insulin signaling.[32] Inositol supplementation has been shown to significantly decrease triglycerides and LDL cholesterol in patients with metabolic diseases.[32]

myo-Inositol is important for thyroid hormone synthesis.[33] Depletion of myo-inositol may predispose to development of hypothyroidism.[33] Patients with hypothyroidism have a higher demand for myo-inositol than healthy subjects.[33]

Inositol should not be routinely implemented for the management of preterm babies who have or are at a risk of

folic acid.[35]

Inositol is considered a safe and effective treatment for polycystic ovary syndrome (PCOS).[36] It works by increasing insulin sensitivity, which helps to improve ovarian function and reduce hyperandrogenism.[37] It is also shown to reduce the risk of metabolic disease in women with PCOS.[38] In addition, thanks to its role as FSH second messenger, myo-inositol is effective in restoring FSH/LH ratio and menstrual cycle regularization.[39] myo-Inositol's role as FSH second messenger leads to a correct ovarian follicle maturation and consequently to a higher oocyte quality. Improving the oocyte quality in both women with or without PCOS, myo-inositol can be considered as a possible approach for increasing the chance of success in assisted reproductive technologies.[40][41] In contrast, D-chiro-inositol can impair oocyte quality in a dose-dependent manner.[42] The high level of DCI seems to be related to elevated insulin levels retrieved in about 70% of PCOS women.[43] In this regard, insulin stimulates the irreversible conversion of myo-inositol to D-chiro-inositol causing a drastic reduction of myo-inositol. myo-Inositol depletion is particularly damaging to ovarian follicles because it is involved in FSH signaling, which is impaired due to myo-inositol depletion.[12] Recent evidence reports a faster improvement of the metabolic and hormonal parameters when these two isomers are administered in their physiological ratio. The plasmatic ratio of myo-inositol and D-chiro-inositol in healthy subjects is 40:1 of myo- and D-chiro-inositol respectively.[44] The use of the 40:1 ratio shows the same efficacy of myo-inositol alone but in a shorter time. In addition, the physiological ratio does not impair oocyte quality.[45]

The use of inositols in PCOS is gaining more importance, and an efficacy higher than 70% with a strong safety profile is reported. On the other hand, about 30% of patients could show as inositol-resistant.[46] New evidence regarding PCOS aetiopathogenesis describes an alteration in the species and the quantity of each strain characterizing the normal gastrointestinal flora. This alteration could lead to chronic, low-level inflammation and malabsorption.[47] A possible solution could be represented by the combination of myo-inositol and α-lactalbumin. This combination shows a synergic effect in increasing myo-inositol absorption.[48] A recent study reported that the myo-inositol and α-lactalbumin combination is able to increase myo-inositol plasmatic content in inositol-resistant patients with a relative improvement of hormonal and metabolic parameters.[49]

Despite its antinutrient effect, phytic acid has potential uses in endodontics, adhesive, preventive, and regenerative dentistry, and in improving the characteristics and performance of dental materials.[50]

Use as a cutting agent

Inositol has been used as an adulterant or

cutting agent for many illegal drugs, such as cocaine, methamphetamine, and sometimes heroin,[51] probably because of its solubility, powdery texture, or reduced sweetness
(50%) compared to more common sugars.

Inositol is also used as a stand-in

film prop for cocaine in filmmaking.[52][53]

Nutritional sources

myo-Inositol is naturally present in a variety of foods, although tables of food composition do not always distinguish between

natto, produces phytase enzymes that may convert phytic acid to a more bioavailable form of inositol polyphosphate in the gut.[55] Additionally, Bacteroides species in the gut secrete vesicles containing an active enzyme which converts the phytate molecule into bioavailable phosphorus and inositol polyphosphate, which is an important signaling molecule in the human body.[56]

myo-Inositol can also be found as an ingredient in energy drinks,[57] either in conjunction with or as a substitute for glucose.[58]

In humans, myo-inositol is naturally made from glucose-6-phosphate through enzymatic dephosphorylation.[54]

References

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External links

Wikimedia Commons has media related to Inositol.
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