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Azad BB, Rota V, Yu L, Mcgirr R, Amant AHS, Lee TY, Dhanvantari S, Luyt LG. Synthesis and Evaluation of Optical and PET GLP-1 Peptide Analogues for GLP-1R Imaging. Mol Imaging 2017. [DOI: 10.2310/7290.2014.00057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Babak Behnam Azad
- Departments of Chemistry, Medical Biophysics, Medicine, Pathology, Medical Imaging, Oncology, The University of Western Ontario; Lawson Health Research Institute; London Regional Cancer Program, London, ON
| | - Vanessa Rota
- Departments of Chemistry, Medical Biophysics, Medicine, Pathology, Medical Imaging, Oncology, The University of Western Ontario; Lawson Health Research Institute; London Regional Cancer Program, London, ON
| | - Lihai Yu
- Departments of Chemistry, Medical Biophysics, Medicine, Pathology, Medical Imaging, Oncology, The University of Western Ontario; Lawson Health Research Institute; London Regional Cancer Program, London, ON
| | - Rebecca Mcgirr
- Departments of Chemistry, Medical Biophysics, Medicine, Pathology, Medical Imaging, Oncology, The University of Western Ontario; Lawson Health Research Institute; London Regional Cancer Program, London, ON
| | - André H. St. Amant
- Departments of Chemistry, Medical Biophysics, Medicine, Pathology, Medical Imaging, Oncology, The University of Western Ontario; Lawson Health Research Institute; London Regional Cancer Program, London, ON
| | - Ting-Yim Lee
- Departments of Chemistry, Medical Biophysics, Medicine, Pathology, Medical Imaging, Oncology, The University of Western Ontario; Lawson Health Research Institute; London Regional Cancer Program, London, ON
| | - Savita Dhanvantari
- Departments of Chemistry, Medical Biophysics, Medicine, Pathology, Medical Imaging, Oncology, The University of Western Ontario; Lawson Health Research Institute; London Regional Cancer Program, London, ON
| | - Leonard G. Luyt
- Departments of Chemistry, Medical Biophysics, Medicine, Pathology, Medical Imaging, Oncology, The University of Western Ontario; Lawson Health Research Institute; London Regional Cancer Program, London, ON
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Behnam Azad B, Rota V, Yu L, McGirr R, St Amant AH, Lee TY, Dhanvantari S, Luyt LG. Synthesis and evaluation of optical and PET GLP-1 peptide analogues for GLP-1R imaging. Mol Imaging 2016; 14. [PMID: 25762192 DOI: 0.2310/7290.2014.00057] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/29/2022] Open
Abstract
A fluorescein-GLP-1 (7-37) analog was generated to determine GLP-1R distribution in various cell types of the pancreas in both strains of mice and receptor-specific uptake was confirmed by blocking with exendin-4. Biodistribution studies were carried out using 68Ga-labeled GLP-1(7-37) peptides in CD1 and C57BL/6 mice. In addition, immunocompromised mice bearing GLP-1R-expressing insulinomas were evaluated by positron emission tomography (PET) imaging and ex vivo biodistribution studies. The optical GLP-1 probe strongly colocalized with immunofluorescence for insulin and glucagon, and more weakly with amylase (exocrine pancreas) and cytokeratin 19 (ductal cells), confirming its application for in situ GLP-1R imaging in various pancreatic cell types. Insulinomas were clearly visualized by in vivo PET. Reducing the peptide positive charge decreased renal retention as well as tumor uptake. Results demonstrate the application of the developed GLP-1 peptide analogues for in situ (optical) and in vivo (PET) imaging of GLP-1R expression.
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Veits GK, Wenz DR, Palmer LI, St. Amant AH, Hein JE, Read de Alaniz J. Cascade rearrangement of furylcarbinols with hydroxylamines: practical access to densely functionalized cyclopentane derivatives. Org Biomol Chem 2015; 13:8465-9. [DOI: 10.1039/c5ob00944h] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aza-Piancatelli rearrangement with hydroxylamines to 4-aminocyclopentenones is described. Subsequent transformations highlight the versatility of the cyclopentene scaffold and the value of the hydroxylamine in this transformation.
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Affiliation(s)
- Gesine K. Veits
- Department of Chemistry and Biochemistry
- University of California
- Santa Barbara
- USA
| | - Donald R. Wenz
- Department of Chemistry and Biochemistry
- University of California
- Santa Barbara
- USA
| | - Leoni I. Palmer
- Department of Chemistry and Biochemistry
- University of California
- Santa Barbara
- USA
| | - André H. St. Amant
- Department of Chemistry and Biochemistry
- University of California
- Santa Barbara
- USA
| | - Jason E. Hein
- Chemistry and Chemical Biology
- University of California
- Merced
- USA
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St. Amant AH, Engbers C, Hudson RH. A solid-phase CuAAC strategy for the synthesis of PNA containing nucleobase surrogates. Artif DNA PNA XNA 2013; 4:4-10. [PMID: 23422048 PMCID: PMC3654728 DOI: 10.4161/adna.23982] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 02/11/2013] [Accepted: 02/12/2013] [Indexed: 11/19/2022]
Abstract
The synthesis of an azide containing PNA monomer is described. The monomer was incorporated into two PNA sequences for the purpose of synthesizing an intercalating fluorophore-labeled PNA and a metal binding hairpin using a solid phase copper catalyzed azide-alkyne Huisgen cycloaddition (CuAAC). Click chemistry was performed using 2-ethynylfluorene or 1-ethynylpyrene to add a fluorophore to the PNA, which were tested for their ability to recognize an abasic site on a DNA target. A PNA hairpin possessing azide monomers at each termini was synthesized and reacted with 2-ethynylpyridine to form a hairpin that is stabilized by Ni²⁺.
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Affiliation(s)
- André H. St. Amant
- Department of Chemistry; The University of Western Ontario; London, ON Canada
| | - Christopher Engbers
- Department of Chemistry; The University of Western Ontario; London, ON Canada
| | - Robert H.E. Hudson
- Department of Chemistry; The University of Western Ontario; London, ON Canada
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St Amant AH, Bean LA, Guthrie JP, Hudson RHE. Click fleximers: a modular approach to purine base-expanded ribonucleoside analogues. Org Biomol Chem 2012; 10:6521-5. [PMID: 22752020 DOI: 10.1039/c2ob25678a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of nucleoside analogues incorporating 4-(5-pyrimidinyl)-1,2,3-triazole aglycons as expanded purine nucleobase mimics were accessed using the copper-catalyzed azide-alkyne Huisgen cycloaddition between a ribosyl azide and 5-alkynylpyrimidines. Depending on the nature of the alkyne employed, other nucleoside analogues that possess fluorescence or potential metal-binding properties were prepared. Computational studies were undertaken on the purine analogues and indicate that the heterocycles of the unfused nucleobase prefer a coplanar arrangement and the anti-glycosidic conformer is favoured in most instances.
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Affiliation(s)
- André H St Amant
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
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St Amant AH, Hudson RHE. Synthesis and oligomerization of Fmoc/Boc-protected PNA monomers of 2,6-diaminopurine, 2-aminopurine and thymine. Org Biomol Chem 2011; 10:876-81. [PMID: 22159214 DOI: 10.1039/c1ob06582c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Boc-protecting group strategy for Fmoc-based PNA (peptide nucleic acid) oligomerization has been developed for thymine, 2,6-diaminopurine (DAP) and 2-aminopurine (2AP). The monomers may be used interchangeably with standard Fmoc PNA monomers. The DAP monomer was incorporated into a PNA and was found to selectively bind to T (ΔT(m)≥ +6 °C) in a complementary DNA strand. The 2AP monomer showed excellent discrimination of T (ΔT(m)≥ +12 °C) over the other nucleobases. 2AP also acted as a fluorescent probe of the PNA:DNA duplexes and displayed fluorescence quenching dependent on the opposite base.
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Affiliation(s)
- André H St Amant
- Department of Chemistry, University of Western Ontario, London, Canada
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