Publications by authors named "Lazarova D"

Purpose: Optimizing outcomes of aesthetic treatments with injectable products usually requires a consideration of the entire face to ensure balance, along with combination treatments that align with the patient's goals. To help injectors, a method of assessing the patient and developing an individualized, holistic treatment plan was developed. This methodology is termed Assessment, Anatomy, Range, and Treatment (AART™) and Holistic Individualized Treatments (HITs™).

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Primary tumors can inhibit the growth of secondary lesions, particularly metastases, in a phenomenon termed "concomitant resistance". Several mechanisms have been proposed for this effect, each supported by experimental data. In this paper, we hypothesize that concomitant resistance is a form of hormesis, a biphasic dose response in which a stimulus has a positive and/or stimulatory effect at low dosages and a negative, inhibitory, and/or toxic effect at higher dosages.

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Article Synopsis
  • * In experiments on glioblastoma mice, Q0/A significantly reduced tumor growth and improved survival rates, demonstrated by increased oxidative stress specifically in the tumor and increased blood flow to the tumor.
  • * The treatment showed stronger anticancer effects compared to a previous method (menadione/ascorbate) and had no noticeable side effects, suggesting it could be a safe option for targeted glioblastoma therapy.
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  • The study introduces a new approach to cancer treatment that targets cancerous mitochondria using "mitocans," specifically redox-cycling quinone/ascorbate (Q/A) pairs, which primarily harm cancer cells while sparing normal cells.
  • Eleven different Q/A combinations were tested on both cultured cancer cells and mice with tumors, leading to a significant reduction in cancer cell growth and survival without major negative effects on healthy cells.
  • The findings highlight that certain Q/A pairs, particularly benzoquinone/ascorbate, induce harmful oxidative stress in cancer cells while showing tolerable impacts on normal cells, attributed to changes in mitochondrial behavior and specific interactions within cancer cells.
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Tumorigenesis typically requires the accumulation of several driver gene mutations; therefore, there is a mutation threshold for the completion of the neoplastic process. Obesity increases the risk of cancer, and we have proposed that one mechanism whereby obesity raises the risk of microsatellite stable (MSS) colon cancer is by decreasing the mutation threshold. Therefore, obese MSS colon cancer patients should exhibit fewer driver gene mutations compared to normal body-mass index (BMI) patients.

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A considerable amount of data have accumulated in the last decade on the pronounced mitochondrial fatty acid oxidation (mFAO) in many types of cancer cells. As a result, mFAO was found to coexist with abnormally activated fatty acid synthesis (FAS) and the mevalonate pathway. Recent studies have demonstrated that overactivated mitochondrial β-oxidation may aggravate the impaired mitochondrial redox state and vice versa.

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Cancer metabolism is an extensively studied field since the discovery of the Warburg effect about 100 years ago and continues to be increasingly intriguing and enigmatic so far. It has become clear that glycolysis is not the only abnormally activated metabolic pathway in the cancer cells, but the same is true for the fatty acid synthesis (FAS) and mevalonate pathway. In the last decade, a lot of data have been accumulated on the pronounced mitochondrial fatty acid oxidation (mFAO) in many types of cancer cells.

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Article Synopsis
  • Glioblastoma is a highly aggressive brain tumor with an imbalance in redox states, making its treatment challenging due to its unique oxidative nature.
  • The study investigates a new treatment approach using a redox-active drug combination (menadione/ascorbate) to specifically target glioblastoma in both animal models and cell cultures, leading to reduced tumor growth and improved survival without harmful side effects.
  • Results showed that the treatment increased oxidative stress and disrupted the cancer cells' functionality while selectively harming glioblastoma cells, as opposed to normal cells, highlighting the potential for targeted therapies in cancer treatment.
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Background/aim: This study analysed the effect of α-tocopheryl succinate (α-TS) on the redox-state of leukemia and normal lymphocytes, as well as their sensitization to fifteen anticancer drugs.

Materials And Methods: Cell viability was analyzed by trypan blue staining and automated counting of live and dead cells. Apoptosis was analyzed by FITC-Annexin V test.

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Article Synopsis
  • - The study introduces a new drug combo, menadione/ascorbate (M/A), aimed at selectively targeting glioblastoma, comparing its effectiveness to the standard chemotherapy, temozolomide (TMZ).
  • - Experiments on glioblastoma mice showed that M/A treatment slowed tumor growth and improved survival rates without the side effects common with TMZ, though M/A's tumor shrinkage was not as significant.
  • - M/A was found to selectively harm glioblastoma cells by increasing mitochondrial superoxide production while leaving normal cells unharmed, suggesting a potential use alongside surgery and traditional treatments for better patient outcomes.
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The multiple-hit hypothesis of cancer, including colorectal cancer (CRC), states that neoplastic development requires a sequence of mutations and epigenetic changes in driver genes. We have previously proposed that obesity increases CRC risk by supporting neoplastic development through adipokine-induced signaling, and this proliferative signaling substitutes for specific driver gene mutations. In support of this hypothesis, analyses of The Cancer Genome Atlas (TCGA) mutation data have revealed that obese patients with microsatellite stable CRC exhibit fewer driver gene mutations than CRC patients with normal body mass index.

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Total redox capacity (TRC) and oxidative stress (OxiStress) of biological objects (such as cells, tissues, and body fluids) are some of the most frequently analyzed parameters in life science. Development of highly sensitive molecular probes and analytical methods for detection of these parameters is a rapidly growing sector of BioTech's R&D industry. The aim of the present study was to develop quantum sensors for tracking the TRC and/or OxiStress in living biological objects using electron-paramagnetic resonance (EPR), magnetic resonance imaging (MRI), and optical imaging.

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Article Synopsis
  • - M/A (menadione/ascorbate) shows a unique capability to kill cancer cells while sparing normal cells, with its anticancer effects linked to mitochondrial dysfunction specifically in cancer cells.
  • - The study revealed that M/A treatment in cancer cells led to significant mitochondrial superoxide production, reduced mitochondrial membrane potential, and lowered levels of ATP and other essential metabolites, showcasing a dose-dependent relationship.
  • - Normal cells displayed only mild oxidative stress from M/A, indicating that this treatment is selectively harmful to cancer cells, suggesting a targeted therapeutic potential for anticancer strategies.
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Background/aim: The aim of this study was to elucidate the possibility of sensitizing colon cancer cells to the chemotherapeutic drug SN38 and investigate its mechanism of action after combined treatment with electroporation (EP).

Materials And Methods: Cells were treated with SN38, EP and their combination for 24/48 h. The cell viability, actin cytoskeleton integrity, mitochondrial superoxide, hydroperoxides, total glutathione, phosphatidyl serine expression, DNA damages and expression of membrane ABC transporters were analyzed using conventional analytical tests.

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Background: Aesthetic physicians have several hundred injectable products to select from. Due to differences in their manufacturing technology, these products display varying biophysical qualities, such as their cohesivity and lift capacity. Currently, there is no guidance to objectively selecting the best product for a particular patient.

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This study reports a non-invasive magnetic resonance imaging (MRI) of kidney dysfunction in mice, based on the induction of redox-imbalance and oxidative stress in the renal tissues, using mito-TEMPO as redox-sensitive contrast probe. Kidney dysfunction was triggered by hypercholesterolemia. The mice were divided in three groups: (i) on normal diet (ND); (ii) on cholesterol diet (CD); (iii) on cholesterol plus cholestyramine diet (CC).

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The present study was directed to the development of EPR methodology for distinguishing cells with different proliferative activities, using "redox imaging." Three nitroxide radicals were used as redox sensors: (a) mito-TEMPO-cell-penetrating and localized mainly in the mitochondria; (b) methoxy-TEMPO-cell-penetrating and randomly distributed between the cytoplasm and the intracellular organelles; and (c) carboxy-PROXYL-nonpenetrating in living cells and evenly distributed in the extracellular environment. The experiments were conducted on eleven cell lines with different proliferative activities and oxidative capacities, confirmed by conventional analytical tests.

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Secondary bile acids (BAs) and short chain fatty acids (SCFAs), two major types of bacterial metabolites in the colon, cause opposing effects on colonic inflammation at chronically high physiological levels. Primary BAs play critical roles in cholesterol metabolism, lipid digestion, and host⁻microbe interaction. Although BAs are reabsorbed via enterohepatic circulation, primary BAs serve as substrates for bacterial biotransformation to secondary BAs in the colon.

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Deregulated Wnt signaling initiates most cases of colorectal cancer (CRC). Butyrate, a product of dietary fiber, hyperactivates Wnt signaling, resulting in induction of CRC cell apoptosis, which may in part explain the protective action of fiber. Nonsense mediated decay (NMD) of mRNAs containing premature stop codons (PTCs) affects tumorigenesis and upregulates Wnt signaling in human embryonic stem cells.

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Background/aim: Recent studies provided convincing evidence for the anticancer activity of combined application of vitamin C and pro-vitamin K3 (menadione). The molecular pathways underlying this process are still not well established. The present study aimed to investigate the effect of the combination of vitamin C plus pro-vitamin K3 on the redox status of leukemia and normal lymphocytes, as well as their sensitizing effect for a variety of anticancer drugs.

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The signing of the National Cancer Act of 1971 by President Nixon marked the beginning of our war on cancer. More than 45 years later, the war is still going steady, with the enemy being almost as strong as in 1971. Furthermore, the increasing rates of obesity not only among adults, but among children and adolescents, are the likely cause for the 30-year trend of colon cancer (CC) becoming a disease of the younger population in the U.

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Dietary fiber is linked to a reduced risk of colorectal cancer (CRC), and this protective activity is likely due to its fermentation product, butyrate. Dependent upon the hyperactivation of Wnt signaling, butyrate represses CRC cell growth and induces apoptosis. However, resistance to butyrate activity may allow for CRC development even in the context of relatively high fiber intake.

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We discuss the hypothesis that ZEB1-Wnt-p300 signaling integrates epithelial to mesenchymal transition (EMT) and resistance to histone deacetylase inhibitors (HDACis) in colorectal cancer (CRC) cells. The HDACi butyrate, derived from dietary fiber, has been linked to CRC prevention, and other HDACis have been proposed as therapeutic agents against CRC. We have previously discussed that resistance to butyrate likely contributes to colonic carcinogenesis, and we have demonstrated that butyrate resistance leads to cross-resistance to cancer therapeutic HDACis.

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Obesity is associated with colorectal cancer (CRC). This effect might be attributed to adipokine-supported signaling. We have established that propolis suppresses survival signaling in CRC cells in vitro; therefore, we ascertained the ability of a propolis supplement to modulate intestinal neoplastic development in C57BL/6J-ApcMin/+/J mice in the lean and obese state.

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Although neoplastic cells exhibit relatively higher sensitivity to hyperthermia than normal cells, hyperthermia has had variable success as an anti-cancer therapy. This variable outcome might be due to the fact that cancer cells themselves have differential degrees of sensitivity to high temperature. We hypothesized that the varying sensitivity of colorectal cancer (CRC) cells to hyperthermia depends upon the differential induction of survival pathways.

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