Navegando por Assunto "Stress"

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    Evaluation of the effect of hydrocortisone in 2D and 3D HEp-2 cell culture
    (CDRR Editors) Fonseca, Marcelo de Oliveira; Godoi, Bruno Henrique; Silva, Newton Soares da; Pacheco-Soares, Cristina
    Introduction: Cancer is one of the diseases with the highest incidence globally and that associated with the patient'semotional state, can act positively or negatively in the treatment. Cortisol is a principal primary stress hormone in the human body. The corticoids can increase cell proliferation and reactive oxygen species that contribute to DNA damage. Prolonged exposure to stress can contribute to tissues becoming insensitive to cortisol, the primary human stress hormone. Objective: This study explores cortisol's influence on tumor cell development, particularly in human cells of carcinoma of the human laryngeal (HEp-2). Methodology: HEp-2 cells were exposed toincreasing cortisol (hydrocortisone) concentrations for 24 or 48 hours, and cytotoxicity (MTT assay) proliferation assay (crystal violet assay), and immunolabeled 3D culture for fibronectin and FAK were analyzed. Results: The group treated with hydrocortisone showed a significant increase in mitochondrial activity, as for the evaluation by the violet crystal, the treated group showed similar behavior to the control. The 3D culture showed dispersed cells within 24hours with reduced FAK labeling; however, no changes were observed within 48 hours. Conclusion: Although some cases favored corticosteroid use in cancer patients, a more detailed analysisis necessary before prescribing them.
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    Influence of Hydrocortisone in Chemotherapy and Photodynamic Therapy in HEp-2 Cells
    (Clinics in Oncology) Moraes, Carlos Dailton Guedes de Oliveira; Godoi, Bruno Henrique; Silva, Newton Soares da; Soares, Cristina Pacheco
    Aim: Cancer cells exhibit resistance to the immune response by regulating and altering the expression of mediators responsible for immune cell recruitment and disease progression. Cortisol is a natural hormone that may be associated with diseases such as cancer by stimulating stress and altering the cellular environment, favoring uncontrolled division and contributing to the inhibition of the immune response. In contrast, current therapeutic strategies do not present significant concerns about stress as a variable in cancer diagnosis and prognosis. The response of HEp-2 cells to stress induced by hydrocortisone and to treatment with Cyclophosphamide (CP) and Photodynamic Therapy (PDT) was analyzed. Methods: One mM of hydrocortisone induced stress in the cells. Cells were treated with 200 μg/ mL of cyclophosphamide or Aluminum Phthalocyanine Tetrasulfonate (AlPcS4) photosensitizer, LED irradiation (660 nm wavelength), intensity of 25 mW/cm2, power of 70 mW, fluence of 5 J/ cm2, characterizing the PDT. All groups were evaluated after 24 h and 48 h. Results: Assessment of stress-inducing mitochondrial activity and cell viability were performed, and the results demonstrated that hydrocortisone significantly altered the rate of cell death, compromising the effects of CP. Conclusion: However, hydrocortisone did not change the cell death rates caused by PDT, indicating the possibility of this hormone as an alternative therapy.