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Kaczorowska A, Malinga-Drozd M, Kałas W, Kopaczyńska M, Wołowiec S, Borowska K. Biotin-Containing Third Generation Glucoheptoamidated Polyamidoamine Dendrimer for 5-Aminolevulinic Acid Delivery System. Int J Mol Sci 2021; 22:1982. [PMID: 33671436 PMCID: PMC7922973 DOI: 10.3390/ijms22041982] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 02/10/2021] [Accepted: 02/15/2021] [Indexed: 01/10/2023] Open
Abstract
Polyamidoamine PAMAM dendrimer generation 3 (G3) was modified by attachment of biotin via amide bond and glucoheptoamidated by addition of α-D-glucoheptono-1,4-lacton to obtain a series of conjugates with a variable number of biotin residues. The composition of conjugates was determined by detailed 1-D and 2-D NMR spectroscopy to reveal the number of biotin residues, which were 1, 2, 4, 6, or 8, while the number of glucoheptoamide residues substituted most of the remaining primary amine groups of PAMAM G3. The conjugates were then used as host molecules to encapsulate the 5-aminolevulinic acid. The solubility of 5-aminolevulinic acid increased twice in the presence of the 5-mM guest in water. The interaction between host and guest was accompanied by deprotonation of the carboxylic group of 5-aminolevulinic acid and proton transfer into internal ternary nitrogen atoms of the guest as evidenced by a characteristic chemical shift of resonances in the 1H NMR spectrum of associates. The guest molecules were most likely encapsulated inside inner shell voids of the host. The number of guest molecules depended on the number of biotin residues of the host, which was 15 for non-biotin-containing glucoheptoamidated G3 down to 6 for glucoheptoamidated G3 with 8 biotin residues on the host surface. The encapsulates were not cytotoxic against Caco-2 cells up to 200-µM concentration in the dark. All encapsulates were able to deliver 5-aminolevulinic acid to cells but aqueous encapsulates were more active in this regard. Simultaneously, the reactive oxygen species were detected by staining with H2DCFDA in Caco-2 cells incubated with encapsulates. The amount of PpIX was sufficient for induction of reactive oxygen species upon 30-s illumination with a 655-nm laser beam.
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Affiliation(s)
- Aleksandra Kaczorowska
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, 27 Wybrzeże Wyspiańskiego Str., 50-370 Wrocław, Poland; (A.K.); (M.K.)
| | | | - Wojciech Kałas
- Department of Experimental Oncology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Rudolfa Weigla 12 Str., 53-114 Wrocław, Poland;
| | - Marta Kopaczyńska
- Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, 27 Wybrzeże Wyspiańskiego Str., 50-370 Wrocław, Poland; (A.K.); (M.K.)
| | - Stanisław Wołowiec
- Medical College, University of Rzeszów, Warzywna 1a, 35-310 Rzeszów, Poland;
| | - Katarzyna Borowska
- Department of Histology and Embryology with Experimental Cytology Unit, Medical University of Lublin, 11 Radziwiłowska Str., 20–080 Lublin, Poland;
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Palau VE, Chakraborty K, Wann D, Lightner J, Hilton K, Brannon M, Stone W, Krishnan K. γ-Tocotrienol induces apoptosis in pancreatic cancer cells by upregulation of ceramide synthesis and modulation of sphingolipid transport. BMC Cancer 2018; 18:564. [PMID: 29769046 PMCID: PMC5956825 DOI: 10.1186/s12885-018-4462-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 04/30/2018] [Indexed: 11/27/2022] Open
Abstract
Background Ceramide synthesis and metabolism is a promising target in cancer drug development. γ-tocotrienol (GT3), a member of the vitamin E family, orchestrates multiple effects that ensure the induction of apoptosis in both, wild-type and RAS-mutated pancreatic cancer cells. Here, we investigated whether these effects involve changes in ceramide synthesis and transport. Methods The effects of GT3 on the synthesis of ceramide via the de novo pathway, and the hydrolysis of sphingomyelin were analyzed by the expression levels of the enzymes serine palmitoyl transferase, ceramide synthase-6, and dihydroceramide desaturase, and acid sphingomyelinase in wild-type RAS BxPC3, and RAS-mutated MIA PaCa-2 and Panc 1 pancreatic cancer cells. Quantitative changes in ceramides, dihydroceramides, and sphingomyelin at the cell membrane were detected by LCMS. Modulation of ceramide transport by GT3 was studied by immunochemistry of CERT and ARV-1, and the subsequent effects at the cell membrane was analyzed via immunofluorescence of ceramide, caveolin, and DR5. Results GT3 favors the upregulation of ceramide by stimulating synthesis at the ER and the plasma membrane. Additionally, the conversion of newly synthesized ceramide to sphingomyelin and glucosylceramide at the Golgi is prevented by the inhibition of CERT. Modulation ARV1 and previously observed inhibition of the HMG-CoA pathway, contribute to changes in membrane structure and signaling functions, allows the clustering of DR5, effectively initiating apoptosis. Conclusions Our results suggest that GT3 targets ceramide synthesis and transport, and that the upregulation of ceramide and modulation of transporters CERT and ARV1 are important contributors to the apoptotic properties demonstrated by GT3 in pancreatic cancer cells.
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Affiliation(s)
- Victoria E Palau
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA.,Department of Pharmaceutical Sciences, Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Kanishka Chakraborty
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Daniel Wann
- Department of Internal Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA
| | - Janet Lightner
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Keely Hilton
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Marianne Brannon
- Department of Pediatrics, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - William Stone
- Department of Pediatrics, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA
| | - Koyamangalath Krishnan
- Division of Hematology-Oncology, Department of Internal Medicine, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, USA.
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Walls ZF, Schwengels M, Palau V. Intracellular sequestration of HER2 via targeted subcellular peptide delivery. J Drug Target 2018. [DOI: 10.1080/1061186x.2018.1450411] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Zachary F. Walls
- Department of Pharmaceutical Sciences, Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, USA
- Center of Excellence for Inflammation, Infectious Disease and Immunity, East Tennessee State University, Johnson City, TN, USA
| | | | - Victoria Palau
- Department of Pharmaceutical Sciences, Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, USA
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Membrane-free culture and real-time barrier integrity assessment of perfused intestinal epithelium tubes. Nat Commun 2017; 8:262. [PMID: 28811479 PMCID: PMC5557798 DOI: 10.1038/s41467-017-00259-3] [Citation(s) in RCA: 186] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 06/14/2017] [Indexed: 12/15/2022] Open
Abstract
In vitro models that better reflect in vivo epithelial barrier (patho-)physiology are urgently required to predict adverse drug effects. Here we introduce extracellular matrix-supported intestinal tubules in perfused microfluidic devices, exhibiting tissue polarization and transporter expression. Forty leak-tight tubules are cultured in parallel on a single plate and their response to pharmacological stimuli is recorded over 125 h using automated imaging techniques. A study comprising 357 gut tubes is performed, of which 93% are leak tight before exposure. EC50-time curves could be extracted that provide insight into both concentration and exposure time response. Full compatibility with standard equipment and user-friendly operation make this Organ-on-a-Chip platform readily applicable in routine laboratories. Efforts to determine the effects of drugs on epithelial barriers could benefit from better in vitro models. Here the authors develop a microfluidic device supporting the growth and function of extracellular matrix-supported intestinal tubules, and evaluate the effect of staurosporine and acetylsalicylic acid on barrier integrity.
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LeJeune TM, Tsui HY, Parsons LB, Miller GE, Whitted C, Lynch KE, Ramsauer RE, Patel JU, Wyatt JE, Street DS, Adams CB, McPherson B, Tsui HM, Evans JA, Livesay C, Torrenegra RD, Palau VE. Mechanism of Action of Two Flavone Isomers Targeting Cancer Cells with Varying Cell Differentiation Status. PLoS One 2015; 10:e0142928. [PMID: 26606169 PMCID: PMC4659548 DOI: 10.1371/journal.pone.0142928] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 10/28/2015] [Indexed: 12/11/2022] Open
Abstract
Apoptosis can be triggered in two different ways, through the intrinsic or the extrinsic pathway. The intrinsic pathway is mediated by the mitochondria via the release of cytochrome C while the extrinsic pathway is prompted by death receptor signals and bypasses the mitochondria. These two pathways are closely related to cell proliferation and survival signaling cascades, which thereby constitute possible targets for cancer therapy. In previous studies we introduced two plant derived isomeric flavonoids, flavone A and flavone B which induce apoptosis in highly tumorigenic cancer cells of the breast, colon, pancreas, and the prostate. Flavone A displayed potent cytotoxic activity against more differentiated carcinomas of the colon (CaCo-2) and the pancreas (Panc28), whereas flavone B cytotoxic action is observed on poorly differentiated carcinomas of the colon (HCT 116) and pancreas (MIA PaCa). Apoptosis is induced by flavone A in better differentiated colon cancer CaCo-2 and pancreatic cancer Panc 28 cells via the intrinsic pathway by the inhibition of the activated forms of extracellular signal-regulated kinase (ERK) and pS6, and subsequent loss of phosphorylation of Bcl-2 associated death promoter (BAD) protein, while apoptosis is triggered by flavone B in poorly differentiated colon cancer HCT 116 and MIA PaCa pancreatic cancer cells through the extrinsic pathway with the concomitant upregulation of the phosphorylated forms of ERK and c-JUN at serine 73. These changes in protein levels ultimately lead to activation of apoptosis, without the involvement of AKT.
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Affiliation(s)
- Timothy M. LeJeune
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Hei Yin Tsui
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Laura B. Parsons
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Gerald E. Miller
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Crystal Whitted
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Kayla E. Lynch
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Robert E. Ramsauer
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Jasmine U. Patel
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Jarrett E. Wyatt
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Doris S. Street
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Carolyn B. Adams
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Brian McPherson
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Hei Man Tsui
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Julie A. Evans
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | - Christopher Livesay
- Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
| | | | - Victoria E. Palau
- Division of Hematology-Oncology, Department of Internal Medicine, James Quillen College of Medicine, East Tennessee State University, Johnson City, TN, 37614, United States of America
- Department of Pharmaceutical Sciences, Bill Gatton College of Pharmacy, East Tennessee State University, Johnson City, TN, 37614, United States of America
- * E-mail:
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