title: Stable tumor vessel normalization with pO₂ increase and endothelial PTEN activation by inositol trispyrophosphate brings novel tumor treatment.
abstract: Tumor hypoxia is a characteristic of cancer cell growth and invasion, promoting angiogenesis, which facilitates metastasis. Oxygen delivery remains impaired because tumor vessels are anarchic and leaky, contributing to tumor cell dissemination. Counteracting hypoxia by normalizing tumor vessels in order to improve drug and radio therapy efficacy and avoid cancer stem-like cell selection is a highly challenging issue. We show here that inositol trispyrophosphate (ITPP) treatment stably increases oxygen tension and blood flow in melanoma and breast cancer syngeneic models. It suppresses hypoxia-inducible factors (HIFs) and proangiogenic/glycolysis genes and proteins cascade. It selectively activates the tumor suppressor phosphatase and tensin homolog (PTEN) in vitro and in vivo at the endothelial cell (EC) level thus inhibiting PI3K and reducing tumor AKT phosphorylation. These mechanisms normalize tumor vessels by EC reorganization, maturation, pericytes attraction, and lowering progenitor cells recruitment in the tumor. It strongly reduces vascular leakage, tumor growth, drug resistance, and metastasis. ITPP treatment avoids cancer stem-like cell selection, multidrug resistance (MDR) activation and efficiently enhances chemotherapeutic drugs activity. These data show that counteracting tumor hypoxia by stably restoring healthy vasculature is achieved by ITPP treatment, which opens new therapeutic options overcoming hypoxia-related limitations of antiangiogenesis-restricted therapies. By achieving long-term vessels normalization, ITPP should provide the adjuvant treatment required in order to overcome the subtle definition of therapeutic windows for in vivo treatments aimed by the current strategies against angiogenesis-dependent tumors.
authors.affiliation: Centre de Biophysique Moléculaire, UPR CNRS 4301, rue Charles Sadron, 45071 Orléans Cedex 2, France. claudine.kieda@cnrs-orleans.fr
authors.forename: Claudine
authors.initials: C
authors.lastname: Kieda
authors.forename: Bouchra
authors.initials: B
authors.lastname: El Hafny-Rahbi
authors.forename: Guillaume
authors.initials: G
authors.lastname: Collet
authors.forename: Nathalie
authors.initials: N
authors.lastname: Lamerant-Fayel
authors.forename: Catherine
authors.initials: C
authors.lastname: Grillon
authors.forename: Alan
authors.initials: A
authors.lastname: Guichard
authors.forename: Jozef
authors.initials: J
authors.lastname: Dulak
authors.forename: Alicja
authors.initials: A
authors.lastname: Jozkowicz
authors.forename: Jerzy
authors.initials: J
authors.lastname: Kotlinowski
authors.forename: Konstantina C
authors.initials: KC
authors.lastname: Fylaktakidou
authors.forename: Aurélien
authors.initials: A
authors.lastname: Vidal
authors.forename: Philippe
authors.initials: P
authors.lastname: Auzeloux
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Miot-Noirault
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Beloeil
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Lehn
authors.forename: Claude
authors.initials: C
authors.lastname: Nicolau
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000098:blood supply / Q000188:drug therapy* / Q000378:metabolism; D002460:Cell Line; D045744:Cell Line, Tumor; D042783:Endothelial Cells / Q000378:metabolism; D005260:Female; D000860:Hypoxia / Q000188:drug therapy; D007295:Inositol Phosphates / Q000494:pharmacology / Q000627:therapeutic use*; D008545:Melanoma / Q000098:blood supply / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D009389:Neovascularization, Pathologic / Q000188:drug therapy; D010100:Oxygen / Q000378:metabolism; D051059:PTEN Phosphohydrolase / Q000378:metabolism; D012878:Skin Neoplasms / Q000098:blood supply / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D047368:Tumor Burden / Q000187:drug effects
chemical_list: D000970:Antineoplastic Agents; D007295:Inositol Phosphates; C516441:inositol trispyrophosphate; D051059:PTEN Phosphohydrolase; C487757:Pten protein, mouse; D010100:Oxygen