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Maroni, Paola; Lombardi, Giovanni; Ferraretto, Anita; Bendinelli, Paola
Pathology, research and practice, August 2024, 2024-08-00, 20240801, Letnik: 260Journal Article
Autophagy is a catabolic pathway involved both in tissue homeostasis and in cellular response to stress. The precise role of autophagy in cancer is still undefined and seems to depend on the tumor stage, appearing tumor-suppressive in physiological conditions and helpful to tumor progression in the established tumor. Here we analyzed by immunohistochemistry Beclin-1, p62, and LC3B, autophagic markers, in human specimens of normal breast, bone metastasis together with pair-matched invasive breast carcinoma of no special type (IBC-NST) as well as non-metastatic breast carcinoma, to disclose the possibility that they could be early prognostic indicators of the evolution of the disease toward the worst outcome. Different regions of metastatic carcinomas, i.e., areas adjacent to the tumor without signs of neoplastic growth, dysplastic lesions, and areas with invasive growth were considered. The pattern of autophagic parameters showed differences among the stages of breast carcinoma progression with a trend that indicated the activation of autophagic process in normal breast (Beclin-1 more elevated than p62), a pattern that was maintained in non-metastatic carcinoma. As the neoplasia proceeds with malignancy, the modification of the pattern of expression of autophagic markers (low ratio between Beclin-1 and p62) in areas of invasive growth of carcinomas suggested inhibition of the process. Of note, the parameters showed a different pattern in bone metastasis with respect to bone metastatic (bm)-IBC-NST, suggesting the reactivation of the autophagic process in the new growth site, helpful to the colonization. The course of autophagy markers during tumor progression could have a prognostic value towards bone metastasis and reveal different roles of the process in different phases of neoplastic growth. The understanding of the role of autophagy in bone metastasis could disclose new therapeutic targets to improve the conditions of patients.
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