2013
DOI: 10.1117/12.2004637
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In-vivoluminescence model for the study of tumor regression and regrowth following combination regimens with differentiation-promoting agents and photodynamic therapy

Abstract: Photodynamic therapy with aminolevulinic acid can be modified by pretreatment regimens with drugs such as 5-Fluorouracil (5-FU) or Vitamin D (calcitriol) that enhance accumulation of protoporphyrin IX (PpIX) within tumor tissue which presumably will enhance the therapeutic response to light. However, histological approaches for monitoring therapeutic responses are poorly suited for studying long term survival because large numbers of mice need to be sacrificed. To address this limitation, a non-invasive model … Show more

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“…The preconditioning approach is based on the fact that differentiation treatment redirects the aberrant pathways and forces the cancer cells to undergo normal growth arrest, differentiation, and apoptosis 1316 . In our previous studies, we showed that nontoxic doses of Vit D (1,25(OH) 2 D 3 ) can increase the expression of porphyrin-synthetic enzymes in the heme biosynthesis pathway, resulting in the increased accumulation of protoporphyrin IX (PpIX), the PS synthesized preferentially in ALA-treated tumor cells 1719 . In addition, our mechanistic studies have also revealed that Vit D pretreatment enhances the activation of extrinsic apoptotic pathways, thereby improving tumor selective cell killing by ALA-PDT 18 .…”
Section: Introductionmentioning
confidence: 99%
“…The preconditioning approach is based on the fact that differentiation treatment redirects the aberrant pathways and forces the cancer cells to undergo normal growth arrest, differentiation, and apoptosis 1316 . In our previous studies, we showed that nontoxic doses of Vit D (1,25(OH) 2 D 3 ) can increase the expression of porphyrin-synthetic enzymes in the heme biosynthesis pathway, resulting in the increased accumulation of protoporphyrin IX (PpIX), the PS synthesized preferentially in ALA-treated tumor cells 1719 . In addition, our mechanistic studies have also revealed that Vit D pretreatment enhances the activation of extrinsic apoptotic pathways, thereby improving tumor selective cell killing by ALA-PDT 18 .…”
Section: Introductionmentioning
confidence: 99%