Navegando por Autor "Pacheco Soares, Cristina"

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    Action of Photodynamic Therapy at Low Fluence in 9 L/lacZ Cells after Interaction with Chlorins
    (MDPI) Vitorio, Gabrielle dos Santos; Godoi, Bruno Henrique; Pinto, Juliana Guerra; Ferreira, Isabelle; Pacheco Soares, Cristina; Ferreira-Strixino, Juliana
    Gliosarcoma (GS) is a primary malignant neoplasm of the central nervous system, treated with an unfavorable prognosis with surgery, radiotherapy, and chemotherapy. The treatment for GS consists of surgical resection, almost always accompanied by radiotherapy and/or chemotherapy, given the invasive behavior of the tumor. Photodynamic Therapy (PDT) is studied as an alternative method that combines light, a photosensitizer (PS), and molecular oxygen. This study aimed to compare the effects of PDT using the photosensitizers Fotoenticine (FTC) and Photodithazine (PDZ) at low concentrations and fluences. For this study, 9 L/lacZ cells, concentrations of 1.55 µg mL−1 , 12.5 µg mL−1 , and 50 µg mL−1 of chlorins and fluences of 1, 5, and 10 J/cm2 were used. A test was also carried out with Trypan Blue in L929 cells at the mentioned concentrations at 5 J/cm2 . Both chlorins were internalized in the cytoplasm, with a significant reduction in viability (>95%) in almost all groups and altered cell adhesion and morphology after PDT. HSP70 expression decreased in both PS, while HSP27 increased only in PDT with FTC, and although there was a change in cell adhesion in the 9 L/LacZ lineage it was not observed in the L929 fibroblast lineage. Both chlorins were effective, highlighting the concentration of 50 µg mL−1 at the fluence of 5 J/cm2 ; according to the present study, the PDZ showed better results.
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    Effects of photobiomodulation on the growth of intestinal bacteria
    (CDRR Editor) Supino, Carolina; Pacheco Soares, Cristina; Silva, Newton Soares da
    Necrotizing enterocolitis is an inflammatory bowel disease that occurs in newborns, more commonly in preterm infants. It is the leading cause of death from gastrointestinal diseases in neonates, and is characterized by the development of diffuse intestinal necrosis in premature infants subjected to stress. The high incidence and lack of effective treatment strategies suggest that new approaches to treating the disease are needed. It is in this context that the possibility of using photobiomodulation as a therapeutic modality arises. However, studies on the use of photobiomodulation in intestinal bacteria are scarce. To study the effect of photobiomodulation used in clinical parameters on the growth of bacteria commonly present in the newborn microbiota. Four strains of bacteria were chosen to be studied, two belonging to healthy intestinal microbiota, Lactobacillus acidophilus and Lactobacillus reuteri, and two pathogenic bacteria, Escherichia coli and Staphylococcus aureus. These bacteria were cultivated in planktonic growth and irradiated with LED at a wavelength of 660 nm and a power density of 0.025 W/cm , at fluences of 1, 5 and 10 J/cm . The evaluation of cell growth was performed through absorbance readings in the periods of 4h, 24h and 48h after irradiation. The growth of L. acidophilus, L. reuteri and S. aureus did not undergo biomodulation in any of the fluences. The growth of E. coli was stimulated at 1 J/cm2 when compared to the Control group, with statistical significance (p<0.005). In the other fluencies there was no biostimulation for the E. coli bacteria. The use of a wavelength of 660 nm in the fluences of 5 J/cm2 and 10 J/cm2 in the studied bacteria did not lead to a significant change in the growth rate.