The aim of the present study was to compare the effectiveness and the safety of different topical agents (glycolic acid, mandelic acid, and grape juice acid mixture) in skin exfoliation by objective instrumental methods. To evaluate the exfoliating effects of these substances, a new experimental in vivo protocol based on DHA (dihydroxyacetone)-induced skin pigmentation was used. Skin acceptabil...

INTRODUCTION AND OBJECTIVES The starting dose for narrowband UV-B phototherapy is determined by a patient's skin phototype or minimal erythema dose (MED). Calculation of MED identifies patients with unsuspected photosensitivity. The aim of this study was to investigate the influence of factors such as concomitant use of photosensitizing agents, diagnosis, and combination with acitretin in patie...

Proton magnetic resonance imaging (MRI) and histological methods were used to evaluate photodynamic therapy (PDT)-induced hemorrhagic necrosis in the murine M1 tumor within 72 h of treatment of male DBA/2 mice. The effects of three photosensitizing drugs were investigated: Photofrin (n = 4), Zn (II) phthalocyanine (n = 7) and benzoporphyrin derivative monoacid ring A (n = 11). As noted in previ...

Among various photosensitizing dyes, 4, 4’-dimethyl 3, 3’-di-n-heptyl-8{2-(4-methyl-3-nheptylthiazole) }-2, 2’-dicarbocyanin diiodide (abb. NK19), even in an extremely low concentration, is known to inhibit the proliferation of bacteria and tissue culture cells (1, 2, 3). With respect to the mechanism of such inhibitory action no other property of this NKl9 is known except that it has a marked ...

Photooxidation reactions of 1,5-dihydroxynaphthalene (DHN) have been carried out in the presence of cyclometalated neutral and cationic iridium (Ir) complexes 1-6 as singlet oxygen ((1)O(2)) sensitizers in order to investigate the (1)O(2) generation quantum yield and photosensitizing durability of the complexes. The reactions allowed a successful kinetic study to provide the pseudo-first-order ...

Objective: On account of several complications and adverse effects associated with the use of conventional chemotherapeutic regimen, the advanced drug-targeted therapies have gained the remarkable attention of the researchers due to their fabulous pharmaceutical and therapeutic advantages. The present study was designed with the aim to synthesize manganese ferrite nanoparticles (MnFe2O4 NPs) an...

UNLABELLED This study evaluated the potential use of dynamic PET to monitor transient metabolic processes and to investigate the mechanisms of action of new photosensitizing drugs in the photodynamic therapy (PDT) of cancer. METHODS Rats bearing 2 mammary tumors received different phthalocyanine-based photosensitizers. The following day, the animals were positioned in a Sherbrooke small-anima...

Photodynamic therapy (PDT) is an effective option for the treatment of solid neoplastic tumors, as well as non-malignant diseases such as dermatological, ophthalmological and benign pathologies. PDT destroys cancer cells by photochemical generation of reactive oxygen species upon absorption of visible light by a photosensitizing agent (PS). Here, we describe the synthesis and characterization o...

BACKGROUND/AIMS 8-Methoxypsoralen (8-MOP), a formerly considered photosensitizing agent, induces apoptosis when used alone. On this basis, the present study was designed to explore the effects and mechanisms of 8-MOP-induced apoptosis in human hepatocellular carcinoma HepG2 cells, independent of its photoactivation. METHODS We analyzed the cell viability with MTT assay. Flow cytometry was use...

The potency of chloroaluminum sulfonated phthalocyanine (ClAlSPc) as a photosensitizing agent for photodynamic therapy of cancer was evaluated in vivo by its ability to be taken up and retained by murine tumors of diverse histological origin. Antitumor effects following laser irradiation were evaluated by measurement of the tumor weights of dissected-out tumor masses. Three tumors (Colo 26, a c...