1
|
Zapata A, Nguyen ML, Ling C, Rogers J, Domiano S, Hayzelden C, Wheeler KE. The role of human serum and solution chemistry in fibrinogen peptide-nanoparticle interactions. NANOSCALE ADVANCES 2020; 2:2429-2440. [PMID: 32864565 PMCID: PMC7448706 DOI: 10.1039/c9na00793h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
In living systems, the biomolecules that coat nanoparticles (NPs) alter the NP biological identity and response. Although some biomolecules are more effective in mediating NP stability or biological fate, it is difficult to monitor an individual biomolecule within the complexity of the biota. To understand the dependence of protein-NP interactions on common variations in blood, we have evaluated binding between silica NPs and a model gamma-fibrinogen (GF) peptide. Fibrinogen is commonly identified within the protein corona fingerprint of human serum, but its abundance on the NP varies. To assess the relative importance of human serum and solution conditions, GF peptide and silica NP interactions were evaluated with and without serum across pH, NaCl concentrations, and glucose concentrations. Initial evaluation of the GF peptide and silica NP complexes using circular dichroism and dynamic light scattering show little change in the secondary structure of the peptide and no significant agglomeration of NPs, suggesting peptide-NP complexes are stable across study conditions. Fluorescence anisotropy was used to monitor GF peptide-NP binding. Both with and without serum, binding constants for the gamma-fibrinogen peptide vary significantly upon addition of diluted HS (1:500) and 29 mM sodium chloride. Yet, results indicated that gamma-fibrinogen binding interactions with silica NPs are comparatively insensitive to physiologically relevant pH changes and dramatic increases in glucose concentrations. Results highlight the importance of blood chemistries, which vary across individuals and disease states, in mediating protein corona formation.
Collapse
Affiliation(s)
- Angela Zapata
- Department of Chemistry & Biochemistry, Santa Clara UniversitySanta ClaraCA 95053USA
| | - Mai-Loan Nguyen
- Department of Chemistry & Biochemistry, Santa Clara UniversitySanta ClaraCA 95053USA
| | - Caleb Ling
- Department of Chemistry & Biochemistry, Santa Clara UniversitySanta ClaraCA 95053USA
| | - Jacqueline Rogers
- Department of Chemistry & Biochemistry, Santa Clara UniversitySanta ClaraCA 95053USA
| | - Sangeetha Domiano
- Department of Chemistry & Biochemistry, Santa Clara UniversitySanta ClaraCA 95053USA
| | - Clive Hayzelden
- Department of Biology, San Francisco State UniversitySan FranciscoCA 94132USA
| | - Korin E. Wheeler
- Department of Chemistry & Biochemistry, Santa Clara UniversitySanta ClaraCA 95053USA
| |
Collapse
|
2
|
Fattori J, Indolfo NDC, Campos JCLDO, Videira NB, Bridi AV, Doratioto TR, Assis MAD, Figueira ACM. Investigation of Interactions between DNA and Nuclear Receptors: A Review of the Most Used Methods. NUCLEAR RECEPTOR RESEARCH 2014. [DOI: 10.11131/2014/101090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Juliana Fattori
- Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas-SP, Brazil
| | - Nathalia de Carvalho Indolfo
- Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas-SP, Brazil
| | | | - Natália Bernardi Videira
- Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas-SP, Brazil
| | - Aline Villanova Bridi
- Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas-SP, Brazil
| | - Tábata Renée Doratioto
- Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas-SP, Brazil
| | - Michelle Alexandrino de Assis
- Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas-SP, Brazil
| | - Ana Carolina Migliorini Figueira
- Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), P.O. Box 6192, Campinas-SP, Brazil
| |
Collapse
|
3
|
Banerjee V, Kar RK, Datta A, Parthasarathi K, Chatterjee S, Das KP, Bhunia A. Use of a small peptide fragment as an inhibitor of insulin fibrillation process: a study by high and low resolution spectroscopy. PLoS One 2013; 8:e72318. [PMID: 24009675 PMCID: PMC3756998 DOI: 10.1371/journal.pone.0072318] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 07/10/2013] [Indexed: 01/13/2023] Open
Abstract
A non-toxic, nine residue peptide, NIVNVSLVK is shown to interfere with insulin fibrillation by various biophysical methods. Insulin undergoes conformational changes under certain stress conditions leading to amyloid fibrils. Fibrillation of insulin poses a problem in its long-term storage, reducing its efficacy in treating type II diabetes. The dissociation of insulin oligomer to monomer is the key step for the onset of fibrillation. The time course of insulin fibrillation at 62°C using Thioflavin T fluorescence shows an increase in the lag time from 120 min without peptide to 236 min with peptide. Transmission electron micrographs show branched insulin fibrils in its absence and less inter-fibril association in its presence. Upon incubation at 62°C and pH 2.6, insulin lost some α-helical structure as seen by Fourier transformed infra-red spectroscopy (FT-IR), but if the peptide is added, secondary structure is almost fully maintained for 3 h, though lost partially at 4 h. FT-IR spectroscopy also shows that insulin forms the cross beta structure indicative of fibrils beyond 2 h, but in the presence of the peptide, α-helix retention is seen till 4 h. Both size exclusion chromatography and dynamic light scattering show that insulin primarily exists as trimer, whose conversion to a monomer is resisted by the peptide. Saturation transfer difference nuclear magnetic resonance confirms that the hydrophobic residues in the peptide are in close contact with an insulin hydrophobic groove. Molecular dynamics simulations in conjunction with principal component analyses reveal how the peptide interrupts insulin fibrillation. In vitro hemolytic activity of the peptide showed insignificant cytotoxicity against HT1080 cells. The insulin aggregation is probed due to the inter play of two key residues, Phe(B24) and Tyr(B26) monitored from molecular dynamics simulations studies. Further new peptide based leads may be developed from this nine residue peptide.
Collapse
Affiliation(s)
| | - Rajiv K. Kar
- Biomolecular NMR and Drug Design Laboratory, Department of Biophysics, Bose Institute, Kolkata, India
| | - Aritreyee Datta
- Biomolecular NMR and Drug Design Laboratory, Department of Biophysics, Bose Institute, Kolkata, India
| | | | - Subhrangsu Chatterjee
- Biomolecular NMR and Drug Design Laboratory, Department of Biophysics, Bose Institute, Kolkata, India
| | - Kali P. Das
- Department of Chemistry, Bose Institute, Kolkata, India
| | - Anirban Bhunia
- Biomolecular NMR and Drug Design Laboratory, Department of Biophysics, Bose Institute, Kolkata, India
| |
Collapse
|
4
|
Zhang C, Nordeen SK, Shapiro DJ. Fluorescence anisotropy microplate assay to investigate the interaction of full-length steroid receptor coactivator-1a with steroid receptors. Methods Mol Biol 2013; 977:339-51. [PMID: 23436375 DOI: 10.1007/978-1-62703-284-1_27] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Estrogens, acting via estrogen receptor (ER) play key roles in growth, differentiation, and gene regulation in the reproductive, central nervous, and skeletal systems. ER-mediated gene transcription contributes to the development and spread of breast, uterine, and liver cancer. Steroid receptor coactivator-1a (SRC1a) belongs to the P160 family of coactivators, which is the best known of the many coactivators implicated in ER-mediated transactivation. Binding of full-length P160 coactivators to steroid receptors has been difficult to investigate in vitro. This chapter details how to investigate the interaction of SRC1a with ER using the fluorescence anisotropy/polarization microplate assay (FAMA).
Collapse
Affiliation(s)
- Chen Zhang
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | | | | |
Collapse
|
5
|
Kretzer NM, Cherian MT, Mao C, Aninye IO, Reynolds PD, Schiff R, Hergenrother PJ, Nordeen SK, Wilson EM, Shapiro DJ. A noncompetitive small molecule inhibitor of estrogen-regulated gene expression and breast cancer cell growth that enhances proteasome-dependent degradation of estrogen receptor {alpha}. J Biol Chem 2010; 285:41863-73. [PMID: 21041310 DOI: 10.1074/jbc.m110.183723] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The mechanisms responsible for 17β-estradiol (E(2))-stimulated breast cancer growth and development of resistance to tamoxifen and other estrogen receptor α (ERα) antagonists are not fully understood. We describe a new tool for dissecting ERα action in breast cancer, p-fluoro-4-(1,2,3,6,-tetrahydro-1,3-dimethyl-2-oxo-6-thionpurin-8-ylthio) (TPSF), a potent small-molecule inhibitor of estrogen receptor α that does not compete with estrogen for binding to ERα. TPSF noncompetitively inhibits estrogen-dependent ERα-mediated gene expression with little inhibition of transcriptional activity by NF-κB or the androgen or glucocorticoid receptor. TPSF inhibits E(2)-ERα-mediated induction of the proteinase inhibitor 9 gene, which is activated by ERα binding to estrogen response element DNA, and the cyclin D1 gene, which is induced by tethering ERα to other DNA-bound proteins. TPSF inhibits anchorage-dependent and anchorage-independent E(2)-ERα-stimulated growth of MCF-7 cells but does not inhibit growth of ER-negative MDA-MB-231 breast cancer cells. TPSF also inhibits ERα-dependent growth in three cellular models for tamoxifen resistance; that is, 4-hydroxytamoxifen-stimulated MCF7ERαHA cells that overexpress ERα, fully tamoxifen-resistant BT474 cells that have amplified HER-2 and AIB1, and partially tamoxifen-resistant ZR-75 cells. TPSF reduces ERα protein levels in MCF-7 cells and several other cell lines without altering ERα mRNA levels. The proteasome inhibitor MG132 abolished down-regulation of ERα by TPSF. Thus, TPSF affects receptor levels at least in part due to its ability to enhance proteasome-dependent degradation of ERα. TPSF represents a novel class of ER inhibitor with significant clinical potential.
Collapse
Affiliation(s)
- Nicole M Kretzer
- Department of Biochemistry, University of Illinois, Urbana, Illinois 61801-3602, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Pabona JMP, Velarde MC, Zeng Z, Simmen FA, Simmen RCM. Nuclear receptor co-regulator Krüppel-like factor 9 and prohibitin 2 expression in estrogen-induced epithelial cell proliferation in the mouse uterus. J Endocrinol 2009; 200:63-73. [PMID: 18835980 PMCID: PMC2612732 DOI: 10.1677/joe-08-0383] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Estrogen, acting through its cognate receptor estrogen receptor-alpha (ESR1), is a critical regulator of uterine endometrial epithelial proliferation. Although the dynamic communication between endometrial stromal (ST) and epithelial cells is considered to be an important component in this process, key molecular players in particular compartments remain poorly defined. Here, we used mice null for Krüppel-like factor 9 (KLF9) to evaluate the contribution of this nuclear protein in ST-epithelial interactions underlying proliferative effects of estrogen. We found that in ovariectomized mice administered estradiol-17beta (E(2)) for 24 h, Klf9 null mutation resulted in lack of E(2)-induced proliferative response in all endometrial compartments. We demonstrated a negative association between Klf9 expression and nuclear levels of ESR1 transcriptional corepressor prohibitin (PHB) 2 in uterine ST and epithelial cells of E(2)-treated wild-type (WT) and Klf9 null mice. In early pregnancy uteri of WT mice, the temporal pattern of Klf9 transcript levels was inversely associated with that of Phb2. Deletion of Klf9 up-regulated uterine Phb2 expression and increased PHB2 nuclear localization in endometrial ST and epithelial cells, with no effects on the expression of the related Phb1. In the human endometrial ST cell line treated with E(2) for 24 h, Klf9 siRNA targeting augmented PHB2 transcript and increased nuclear PHB2 protein levels, albeit this effect was not to the extent seen in vivo with Klf9 null mutants. Our findings suggest a novel mechanism for control of estrogen-induced luminal epithelial proliferation involving ST KLF9 regulation of paracrine factor(s) to repress epithelial expression of corepressor PHB2.
Collapse
Affiliation(s)
- J M P Pabona
- Department of Physiology and Biophysics, University of Arkansas for Medical Sciences and Arkansas Children's Nutrition Center, Little Rock, Arkansas 72202, USA
| | | | | | | | | |
Collapse
|
7
|
Vaz B, Möcklinghoff S, Brunsveld L. Targeting the Nuclear Receptor–Cofactor Interaction. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/9783527623297.ch2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
8
|
Mao C, Patterson NM, Cherian MT, Aninye IO, Zhang C, Montoya JB, Cheng J, Putt KS, Hergenrother PJ, Wilson EM, Nardulli AM, Nordeen SK, Shapiro DJ. A new small molecule inhibitor of estrogen receptor alpha binding to estrogen response elements blocks estrogen-dependent growth of cancer cells. J Biol Chem 2008; 283:12819-30. [PMID: 18337247 PMCID: PMC2442351 DOI: 10.1074/jbc.m709936200] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2007] [Revised: 03/12/2008] [Indexed: 12/21/2022] Open
Abstract
Estrogen receptor alpha (ERalpha) plays an important role in several human cancers. Most current ERalpha antagonists bind in the receptor ligand binding pocket and compete for binding with estrogenic ligands. Instead of the traditional approach of targeting estrogen binding to ER, we describe a strategy using a high throughput fluorescence anisotropy microplate assay to identify small molecule inhibitors of ERalpha binding to consensus estrogen response element (cERE) DNA. We identified small molecule inhibitors of ERalpha binding to the fluorescein-labeled (fl)cERE and evaluated their specificity, potency, and efficacy. One small molecule, theophylline, 8-[(benzylthio)methyl]-(7CI,8CI) (TPBM), inhibited ERalpha binding to the flcERE (IC(50) approximately 3 microm) and inhibited ERalpha-mediated transcription of a stably transfected ERE-containing reporter gene. Inhibition by TPBM was ER-specific, because progesterone and glucocorticoid receptor transcriptional activity were not significantly inhibited. In tamoxifen-resistant breast cancer cells that overexpress ERalpha, TPBM inhibited 17beta-estradiol (E(2))-ERalpha (IC(50) 9 microm) and 4-hydroxytamoxifen-ERalpha-mediated gene expression. Chromatin immunoprecipitation showed TPBM reduced E(2).ERalpha recruitment to an endogenous estrogen-responsive gene. TPBM inhibited E(2)-dependent growth of ERalpha-positive cancer cells (IC(50) of 5 microm). TPBM is not toxic to cells and does not affect estrogen-independent cell growth. TPBM acts outside of the ER ligand binding pocket, does not act by chelating the zinc in ER zinc fingers, and differs from known ERalpha inhibitors. Using a simple high throughput screen for inhibitors of ERalpha binding to the cERE, a small molecule inhibitor has been identified that selectively inhibits ERalpha-mediated gene expression and estrogen-dependent growth of cancer cells.
Collapse
Affiliation(s)
- Chengjian Mao
- Department of Biochemistry, and Chemistry, University of Illinois, Urbana, Illinois 61810-3602, USA
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|