Psychological aspects of Eros

Based on a lecture given at the Summer Conference of the Guild of Pastoral Psychology, 29 Aug 1991SIGLEGBUnited Kingdo

Synthesis, cytotoxic activity and quantum chemical calculations of new 7-thioxopyrazolo[1,5-f]pyrimidin-2-one derivatives

The reactions of 1-amino-2-thioxo-1,2-dihydropyrimidin derivatives 1 and 2 with chloroacetyl chloride in the presence of sodium acetate led to the formation of 7-thioxopyrazolo [1,5-f]pyrimidin-2(1H,3H,7H)-one derivatives (3 and 4) in 78-80% yields. The structure of these newly synthesized compounds 3 and 4 were fully characterized by H-1 NMR, C-13 NMR, FT-IR spectroscopies and elemental analyses. The quantum-chemical calculations were made to find molecular properties of the 3 and 4 by using DFT/B3LYP method with 6-311++G(2d, 2p) basis set. Quantum chemical features such as HOMO, LUMO, energy gap, ionization potential, chemical hardness, softness, electronegativity, dipole moment and etc. values for gas and solvent phase of neutral molecules were calculated and discussed. Furthermore, the cytotoxic activities of 3 and 4 were tested against human liver cancerous cell line (HepG2) and human breast cancerous cell line (MDA-MB-231) for 24 h and 48 h, respectively. (C) 2019 Elsevier B.V. All rights reserved

Photoactivation of Endogenous Latent Transforming Growth Factor- 1 Directs Dental Stem Cell Differentiation for Regeneration

Rapid advancements in the field of stem cell biology have led to many current efforts to exploit stem cells as therapeutic agents in regenerative medicine. However, current ex vivo cell manipulations common to most regenerative approaches create a variety of technical and regulatory hurdles to their clinical translation, and even simpler approaches that use exogenous factors to differentiate tissue-resident stem cells carry significant off-target side effects. We show that non-ionizing, low-power laser (LPL) treatment can instead be used as a minimally invasive tool to activate an endogenous latent growth factor complex, transforming growth factor–β1 (TGF-β1), that subsequently differentiates host stem cells to promote tissue regeneration. LPL treatment induced reactive oxygen species (ROS) in a dose-dependent manner, which, in turn, activated latent TGF-β1 (LTGF-β1) via a specific methionine residue (at position 253 on LAP). Laser-activated TGF-β1 was capable of differentiating human dental stem cells in vitro. Further, an in vivo pulp capping model in rat teeth demonstrated significant increase in dentin regeneration after LPL treatment. These in vivo effects were abrogated in TGF-β receptor II (TGF-βRII) conditional knockout (DSPP(Cre)TGF-βRII(fl/fl)) mice or when wild-type mice were given a TGF-βRI inhibitor. These findings indicate a pivotal role for TGF-β in mediating LPL-induced dental tissue regeneration. More broadly, this work outlines a mechanistic basis for harnessing resident stem cells with a light-activated endogenous cue for clinical regenerative applications