PD 169316

IC50: A potent, selective and cell-permeable suppressor of p38 MAP kinase, with the IC50 value of 89 nM.

PD169316, a specific p38 MAPK inhibitor, blocks signal transduction mediated by both TGF-β and Activin A, but not bone morphogenetic protein (BMP) 4. Suppression on TGF-β signaling in a dose-dependent manner may then reduce Smad2 and Smad3 phosphorylation, block nuclear translocation and increase the expression of TGF-β target gene. [1]

In vitro: It was reported that pretreatment of CaOV3 cells with 10 M PD169316 caused a significant decrease in Smad2 and Smad3 phosphorylation which was mediated by TGF-β. The inhibitory effect of PD 169316 was proved to act in a dose-dependent manner. Study also demonstrated that PD169316 at 5 M or higher dose directly suppressed TGF-β signaling activity. [1]

In vivo: Based on an amyloid β (Aβ) rat model of Alzheimer's disease, the effect of PD 169316 on apoptosis induced by amyloid beta was examined. It was demonstrated that caspase-3 and Bax/Bcl-2 ratio, two marks of apoptosis, were significantly decreased in the rats pre-treated with PD169316 intracerebroventricularly. This study suggested the potential neuroprotective role of PD 169316 against the neuronal toxicity induced by Aβ. [2]

Clinical trial: So far, no clinical trial has been conducted.

References:
[1]Fu YX, O’Connor LM, Shepherd TG and Nachtigal MW.  The p38 MAPK inhibitor, PD169316, inhibits transforming growth factor β-induced Smad signaling in human ovarian cancer cells. Biochem Bioph Res Co. 2003. 310: 3917.
[2]Ashabi G, Alamdary SZ, Ramin M and Khodagholi F.  Reduction of hippocampal apoptosis by intracerebroventricular administration of extracellular signal-regulated protein kinase and/or P38 inhibitors in amyloid beta rat model of Alzheimer’s disease: involvement of nuclear-related factor-2 and nuclear factor-κb. Basic Clin. Pharmacol. Toxicol. 2013 Aug. 112: 145–55.

Pd-Catalyzed Acyl C-O Bond Activation for Selective Ring-Opening of alpha-Methylene-beta-lactones with Amines.[Pubmed:28375015]

Org Lett. 2017 Apr 21;19(8):1966-1969.

A Pd-catalyzed ring-opening of beta-lactones with various types of amines (primary, secondary, and aryl) to provide beta-hydroxy amides with excellent selectivity toward acyl C-O bond cleavage is reported. The utility of this protocol is demonstrated in an asymmetric kinetic resolution providing enantioenriched alpha-methylene-beta-lactones.

CD8 T-cell regulation by T regulatory cells and the programmed cell death protein 1 pathway.[Pubmed:28375543]

Immunology. 2017 Jun;151(2):146-153.

The primary function of the immune system is to protect the host from infectious microorganisms and cancers. However, a major component of the immune response involves the direct elimination of cells in the body and the induction of systemic inflammation, which may result in life-threatening immunopathology. Therefore, the immune system has developed complex mechanisms to regulate itself with a specialized subset of CD4 T lymphocytes (referred to as regulatory T cells) and immune checkpoint pathways, such as the programmed cell death protein 1 pathway. These immune regulatory mechanisms can be exploited by pathogens and tumours to establish persistence in the host, warranting a deeper understanding of how to fine-tune immune responses during these chronic diseases. Here, I discuss various features of immune regulatory pathways and what important aspects must be considered in the next generation of therapies to reverse immune exhaustion, understanding that this process is a natural mechanism to prevent the host from destroying itself.

Pd(II)-Catalyzed Direct ortho-C-H Acylation of Aromatic Ketones by Oxidative Decarboxylation of alpha-Oxocarboxylic Acids.[Pubmed:28374587]

Org Lett. 2017 Apr 21;19(8):2082-2085.

A Pd-catalyzed decarboxylative acylation of aromatic ketones with alpha-oxocarboxylic acids was developed, and 1,2-diacylbenzenes were formed in up to 90% yield with excellent ortho-selectivity. This work demonstrates the first successful attempt to direct C-H acylation of aromatic ketones without the need for prederivatization to imines. The acylation reaction was inhibited by radical scavengers such as TEMPO, and 2,2,6,6-tetramethylpiperidin-1-yl benzoate, the adduct of TEMPO and a benzoyl radical, has been isolated and characterized. This finding is compatible with the intermediacy of acyl radicals. A mechanism involving the reaction of the palladacyclic complexes of aryl ketones with acyl radicals is proposed.

Isocyanide insertion across the Pd-C bond of allenyl and propargyl palladium complexes bearing phosphoquinoline as a spectator ligand. Synthesis of a palladium complex bearing a coordinated cyclobutenyl fragment.[Pubmed:28374876]

Dalton Trans. 2017 Apr 19;46(16):5210-5217.

We have studied the insertion of p-toluenesulfonylmethyl isocyanide (TosMIC) on selected allenyl and propargyl complexes of palladium bearing diphenylphosphine quinoline as a spectator ligand. The fast process gives different products depending on the tautomer involved in the reaction. Thus, the unsubstituted allenyl species yields an insertion complex with the isocyanide coordinated between the metal and the first allenyl carbon. On the other hand, a mixture of phenyl substituted allenyl and propargyl palladium complexes yields a novel species characterized by a cyclo-butenyl fragment directly coordinated to palladium. The solid state structure of such a complex together with an exhaustive kinetic study of the whole process is reported.

PD 169316 is a potent, cell-permeable and selective p38 MAP kinase inhibitor, with IC50 of 89 nM. PD169316 selectively inhibits the kinase activity of the phosphorylated p38 without hindering upstream kinases to phosphorylate p38. PD169316 shows antiviral activity against Enterovirus71. PD169316 shows antiviral activity against Enterovirus71.

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