Myo-Inositol trispyrophosphate

myo-Inositol trispyrophosphate (ITPP) is an inositol phosphate, a pyrophosphate, a drug candidate, and a putative performance-enhancing substance, which exerts its biological effects by increasing tissue oxygenation.^[1]

myo-Inositol trispyrophosphate

Names
Other names ITPP myo-Inositol cyclic 1,2:3,4:5,6-tris(dihydrogen pyrophosphate) myo-Inositol cyclic 1,2:3,4:5,6-tris(P,P'-dihydrogen diphosphate) Hexahydrobis[1,3,5,2,4]trioxadiphosphepino[6,7-g:6',7'-i][1,3,5,2,4]benzotrioxadiphosphepine-2,4,7,9,12,14-hexol 2,4,7,9,12,14-hexaoxide
Identifiers
CAS Number	623552-11-4
3D model (JSmol)	Interactive image
ChemSpider	8615402
MeSH	C516441
PubChem CID	10439981
InChI InChI=1S/C6H12O21P6/c7-28(8)19-1-2(20-29(9,10)25-28)4-6(24-33(17,18)27-32(15,16)23-4)5-3(1)21-30(11,12)26-31(13,14)22-5/h1-6H,(H,7,8)(H,9,10)(H,11,12)(H,13,14)(H,15,16)(H,17,18) Key: HEDKSUBRULAYNO-UHFFFAOYSA-N InChI=1S/C6H12O21P6/c7-28(8)19-1-2(20-29(9,10)25-28)4-6(24-33(17,18)27-32(15,16)23-4)5-3(1)21-30(11,12)26-31(13,14)22-5/h1-6H,(H,7,8)(H,9,10)(H,11,12)(H,13,14)(H,15,16)(H,17,18) Key: HEDKSUBRULAYNO-UHFFFAOYSA-N
SMILES C12C(C3C(C4C1OP(=O)(OP(=O)(O4)O)O)OP(=O)(OP(=O)(O3)O)O)OP(=O)(OP(=O)(O2)O)O
Properties
Chemical formula	C6H12O21P6
Molar mass	605.984 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chemistry

ITPP is a pyrophosphate derivative of phytic acid with the molecular formula C₆H₁₂O₂₁P₆.^[1]

Biological effects

ITPP is a membrane-permeant allosteric regulator of hemoglobin that mildly reduces its oxygen-binding affinity, which shifts the oxygen-hemoglobin dissociation curve to the right and thereby increases oxygen release from the blood into tissue.^[1] Phytic acid, in contrast, is not membrane-permeant due to its charge distribution.^[1]

Rodent studies in vivo demonstrated increased tissue oxygenation and dose-dependent increases in endurance during physical exercise, in both healthy mice and transgenic mice expressing a heart failure phenotype.^[1]

The substance is believed to have a high potential for use in athletic doping, and liquid chromatography–mass spectrometry tests have been developed to detect ITPP in urine tests.^[2] Its use as a performance-enhancing substance in horse racing has also been suspected and similar tests have been developed for horses^[3]

ITPP has been studied for potential adjuvant use in the treatment of cancer in conjunction with chemotherapy, due to its effects in reducing tissue hypoxia.^[4] Human clinical trials were registered in 2014 under the compound number OXY111A.^[5] The substance has also been examined in the context of other illnesses involving hypoxia, such as cardiovascular disease and dementia^[2]

See also

• Phytic acid
• Inositol
• Inositol phosphate
• Inositol trisphosphate
• myo-Inositol