title: Alkoxymethylenephosphonate analogues of (Lyso) phosphatidic acid stimulate signaling networks coupled to the LPA2 receptor.
abstract: An efficient stereocontrolled synthesis afforded alkoxymethylenephosphonate (MP) analogues of lysophosphatidic acid (LPA) and phosphatidic acid (PA). The pharmacological properties of MP-LPA and MP-PA analogues were characterized for LPA receptor subtype-specific agonist and antagonist activity using Ca(2+)-mobilization assays in RH7777 cells expressing the individual LPA(1)-LPA(3) receptors and CHO cells expressing LPA(4). In addition, activation of a PPARgamma reporter gene construct expressed in CV-1 cells was assessed. These metabolically stabilized LPA analogues exhibited an unexpected pattern of partial agonist/antagonist activity for the LPA G-protein-coupled receptor family and the intracellular LPA receptor PPARgamma. Analogues were compared with 18:1 LPA for activation of downstream signaling in HT-29 colon cancer cells, which exclusively express LPA(2), and both SKOV3 and OVCAR3 ovarian cancer cells, which express LPA(1), LPA(2), and LPA(3). Unexpectedly, reverse phase protein arrays showed that four MP-LPA and MP-PA analogues selectively activated downstream signaling in HT-29 cells with greater potency than LPA. In particular, the oleoyl MP-LPA analogue strongly promoted phosphorylation and activation of AKT, MEK, and pS6 in HT-29 cells in a concentration-dependent manner. In contrast, the four MP-LPA and MP-PA analogues were equipotent with LPA for pathway activation in the SKOV3 and OVCAR3 cells. Taken together, these results suggest that the MP analogues may selectively activate signaling via the LPA(2) receptor subtype, while simultaneously suppressing signaling through the LPA(1) and LPA(3) subtypes.
authors.affiliation: Department of Medicinal Chemistry, University of Utah, 419 Wakara Way, Suite 205, Salt Lake City, UT 84108-1257, USA.
authors.forename: Joanna
authors.initials: J
authors.lastname: Gajewiak
authors.forename: Ryoko
authors.initials: R
authors.lastname: Tsukahara
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Tsukahara
authors.forename: Yuko
authors.initials: Y
authors.lastname: Fujiwara
authors.forename: Shuanxing
authors.initials: S
authors.lastname: Yu
authors.forename: Yiling
authors.initials: Y
authors.lastname: Lu
authors.forename: Mandi
authors.initials: M
authors.lastname: Murph
authors.forename: Gordon B
authors.initials: GB
authors.lastname: Mills
authors.forename: Gabor
authors.initials: G
authors.lastname: Tigyi
authors.forename: Glenn D
authors.initials: GD
authors.lastname: Prestwich
mesh_terms: D045744:Cell Line, Tumor; D006801:Humans; D008246:Lysophospholipids / Q000378:metabolism / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D009369:Neoplasms / Q000378:metabolism / Q000473:pathology; D063065:Organophosphonates / Q000737:chemistry*; D049368:Receptors, Lysophosphatidic Acid / Q000737:chemistry / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction
chemical_list: D008246:Lysophospholipids; D063065:Organophosphonates; D049368:Receptors, Lysophosphatidic Acid; C032881:lysophosphatidic acid