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Malona J, Chuaqui C, Seletsky BM, Beebe L, Cantin S, Kalken DVAN, Fahnoe K, Wang Z, Browning B, Szabo H, Koopman LA, Oravecz T, McDonald JJ, Ramirez-Valle F, Gaur R, Mensah KA, Thomas M, Connarn JN, Hu H, Alexander MD, Corin AF. Discovery of CC-99677, a selective targeted covalent MAPKAPK2 (MK2) inhibitor for autoimmune disorders. Transl Res 2022; 249:49-73. [PMID: 35691544 DOI: 10.1016/j.trsl.2022.06.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 05/13/2022] [Accepted: 06/03/2022] [Indexed: 12/11/2022]
Abstract
As an anti-inflammatory strategy, MAPK-activated protein kinase-2 (MK2) inhibition can potentially avoid the clinical failures seen for direct p38 inhibitors, especially tachyphylaxis. CC-99677, a selective targeted covalent MK2 inhibitor, employs a rare chloropyrimidine that bonds to the sulfur of cysteine 140 in the ATP binding site via a nucleophilic aromatic substitutions (SNAr) mechanism. This irreversible mechanism translates biochemical potency to cells shown by potent inhibition of heat shock protein 27 (HSP27) phosphorylation in LPS-activated monocytic THP-1 cells. The cytokine inhibitory profile of CC-99677 differentiates it from known p38 inhibitors, potentially suppressing a p38 pathway inflammatory response while avoiding tachyphylaxis. Dosed orally, CC-99677 is efficacious in a rat model of ankylosing spondylitis. Single doses, 3 to 400 mg, in healthy human volunteers show linear pharmacokinetics and apparent sustained tumor necrosis factor-α inhibition, with a favorable safety profile. These results support further development of CC-99677 for autoimmune diseases like ankylosing spondylitis.
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Knight KAW, McDonald JJ, Davenport RJ. 128 Variety is the splice of life. Journal of Neurology, Neurosurgery and Psychiatry 2022. [DOI: 10.1136/jnnp-2022-abn.453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Case 1: A 42-year-old female presented with progressive exertional breathlessness over 2 years. She was breathless at rest and had bilateral Trendelenburg signs. Pulmonary function testing demonstrated a restrictive defect. Serum CK was elevated at 300. EMG demonstrated myotonia. We considered a wide differential, but a very low alpha glucosidase level led to genetic testing revealing GAA heterozygosity (c.-32–13T>G and c.1528G>A; p.(Trp516*) variants), confirming Pompe disease.Case 2: A 35-year-old female presented with a 20-year history of arm and leg weakness. Examination revealed proximal weakness affecting all four limbs but no respiratory involvement. Investigations dem- onstrated a raised CK of 1,000. Neurophysiology confirmed myopathic changes. An alpha glucosidase level was low on two occasions. Genetic testing confirmed GAA heterozygosity: (c.-32–13T>G variant and GAA exon 18 deletion) confirming Pompe disease.Pompe disease is an autosomal recessive condition caused by mutations in the GAA gene. Enzyme deficiency leads to impaired glycogen breakdown, with subsequent body tissue accumulation. GSD-II may present with varying phenotypes which are influenced by genotypic variations and level of enzyme activity, as these cases demonstrate. Diagnosis is important as enzyme replacement therapy is available. The clue is a low alpha-glucosidase level, a simple but crucial test to perform.kawknight@gmail.com89
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Liu H, Niu D, Tham Sjin RT, Dubrovskiy A, Zhu Z, McDonald JJ, Fahnoe K, Wang Z, Munson M, Scholte A, Barrague M, Fitzgerald M, Liu J, Kothe M, Sun F, Murtie J, Ge J, Rocnik J, Harvey D, Ospina B, Perron K, Zheng G, Shehu E, D’Agostino LA. Discovery of Selective, Covalent FGFR4 Inhibitors with Antitumor Activity in Models of Hepatocellular Carcinoma. ACS Med Chem Lett 2020; 11:1899-1904. [PMID: 33062171 DOI: 10.1021/acsmedchemlett.9b00601] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Accepted: 03/06/2020] [Indexed: 12/28/2022] Open
Abstract
Hepatocellular carcinoma (HCC) accounts for a majority of primary liver cancer and is one of the most common forms of cancer worldwide. Aberrant signaling of the FGF19-FGFR4 pathway leads to HCC in mice and is hypothesized to be a driver in FGF19 amplified HCC in humans. Multiple small molecule inhibitors have been pursued as targeted therapies for HCC in recent years, including several selective FGFR4 inhibitors that are currently being evaluated in clinical trials. Herein, we report a novel series of highly selective, covalent 2-amino-6,8-dimethyl-pyrido[2,3-d]pyrimidin-7(8H)-ones that potently and selectively inhibit FGFR4 signaling through covalent modification of Cys552, which was confirmed by X-ray crystallography. Correlative target occupancy and pFGFR4 inhibition were observed in vivo, as well as tumor regression in preclinical models of orthotopic and sorafenib-resistant HCC.
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Chamberlain PP, D’Agostino LA, Ellis JM, Hansen JD, Matyskiela ME, McDonald JJ, Riggs JR, Hamann LG. Evolution of Cereblon-Mediated Protein Degradation as a Therapeutic Modality. ACS Med Chem Lett 2019; 10:1592-1602. [PMID: 31857833 DOI: 10.1021/acsmedchemlett.9b00425] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 11/12/2019] [Indexed: 02/07/2023] Open
Abstract
Many cellular processes and pathways are mediated by the regulation of protein-protein complexes. For example, E3 ubiquitin ligases recruit substrate proteins and transfer a ubiquitin tag to target those proteins for destruction by the proteasome. It has now been shown that this cellular process for protein destruction can be redirected by small molecules in both laboratory and clinical settings. This presents a new paradigm in drug discovery, enabling the rapid removal of target proteins linked to disease. In this Innovations review, we will describe the work done on cereblon as a case study on the different strategies available for targeted protein degradation.
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Hong FC, Devine P, McDonald JJ, Cologne K, Brady RRW. Social media engagement amongst 2017 colorectal surgery Tripartite Meeting attendees: updates on contemporary social media use. Colorectal Dis 2018; 20:O114-O118. [PMID: 29509990 DOI: 10.1111/codi.14058] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 02/13/2018] [Indexed: 12/13/2022]
Abstract
AIM Engagement by medical professionals with social media (SM) is increasing. Variation is noted in engagement between SM platforms and between surgical specialities and geographical regions. We aimed to study SM engagement by colorectal surgeons attending an international conference. METHOD Surgeons were identified from the delegate list of the 2017 Annual Meeting of the American Society of Colon and Rectal Surgeons (ASCRS) and Tripartite Meeting (Seattle, Washington, USA). Delegates were searched on Twitter and LinkedIn for the presence of a matching profile. SM presence, activity, gender and geographical region were analysed. RESULTS Two hundred and seventy (13.2%) surgeons had Twitter accounts and 994 (44.3%) had LinkedIn profiles. UK surgeons were more likely to be on Twitter than surgeons from elsewhere (23.4% vs 12.7%, P = 0.0072). Significant variation in SM membership between each geographical region was noted, with usage rates for Twitter of 18.1% in Europe, 14.4% in North America, 12.9% in South America, 4.3% in Oceania, 3.7% in Asia and 0% in Africa. A similar picture for LinkedIn is seen. The #ASCRS17 meeting saw the highest participation of users to date (979 participants, over 7000 individual tweets and nearly 14 million impressions). CONCLUSION SM engagement by colorectal surgeons continues to increase. Significant geographical variation is noted, suggesting that SM's unique potential for education and networking may not yet be widely appreciated globally. Future work should include further analysis into tweet contents to gain insights and optimize the use of SM as an educational adjunct.
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Kilkenny J, McDonald JJ, Brady RR. Increased engagement with social media in colorectal surgery. Colorectal Dis 2017; 19:592-594. [PMID: 28477367 DOI: 10.1111/codi.13712] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 03/14/2017] [Indexed: 02/08/2023]
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Lui DH, McDonald JJ, de Beaux A, Tulloh B, Brady RRW. Contemporary engagement with social media amongst hernia surgery specialists. Hernia 2017; 21:509-515. [PMID: 28424931 DOI: 10.1007/s10029-017-1609-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Accepted: 04/04/2017] [Indexed: 11/25/2022]
Abstract
PURPOSE Healthcare professional engagement is increasing. This study aims to identify levels of adoption and engagement of several social media platforms by a large international cohort of hernia surgery specialists. METHODS Hernia specialists attending the 38th International Congress of the European Hernia Society were identified. A manual search was then performed on Twitter, ResearchGate, and LinkedIn to identify those who had named accounts. Where accounts were identified, data on markers of utilisation were assessed. RESULTS 759 surgeons (88.5% male) from 57 countries were identified. 334 surgeons (44%) engaged with a social media platform. 39 (5.1%) had Twitter accounts, 189 (24.9%) had ResearchGate accounts and 265 (34.9%) had LinkedIn accounts. 137 surgeons (18.1%) had accounts on 2 or more social media platforms. There was no gender association with social media account ownership (p > 0.05). Engagement in one social media platform was associated with increased engagement and utilisation on other platforms; LinkedIn users were more likely to have Twitter accounts (p < 0.001) and ResearchGate profiles (p < 0.001). Surgeons on all three SM platforms were more likely to have high markers of engagement across all SM platforms (multiple outcomes, p < 0.05). Geographical variation was noted with UK and South American Surgeons being more likely to be present on Twitter than their counterparts (p = 0.031). CONCLUSIONS The level of engagement with social media amongst Hernia surgeons is similar to other surgical specialities. Geographical variation in SM engagement is seen. Engagement with one SM platform is associated with presence on multiple platforms.
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Potts KE, Smidt ML, Tucker SP, Stiebel TR, McDonald JJ, Stallings WC, Bryant ML. In vitro Sequential Selection and Characterization of Human Immunodeficiency Virus Type 1 Variants with Reduced Sensitivity to Hydroxyethylurea Protease Inhibitors. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/095632029700800508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In vitro resistance to the human immunodeficiency virus (HIV) protease inhibitors SC-52151 and SC-55389A was evaluated in an in vitro sequential selection scheme. HIVRF variants were selected for reduced sensitivity to SC-52151 and subsequently passaged in both SC-52151 and a structurally different hydroxyethylurea protease inhibitor, SC-55389A, to select for dual-resistant virus. SC-52151 selection alone resulted in a 23-fold reduction in virus sensitivity whereas selection in both inhibitors resulted in 34- and eightfold reductions in virus sensitivity to SC-52151 and SC-55389A, respectively. Sequence analysis of the protease gene revealed that SC-52151 -resistant virus had a Gly to Val substitution at residue 48 (G48V) and, in 58% of subclones, an accompanying Val to Ala substitution at residue 82 (V82A). Dual-resistant virus had both G48V and V82A substitutions present and, in the majority of subclones, an lle to Thr and/or Leu to Pro substitution at residues 54 and 63, respectively. Drug susceptibility assays with limiting dilution-cloned HIVRFR (G48V/V82A) and HIVRFRR (G48V/154T/L63P/V82A) viruses demonstrated moderate to high-level cross-resistance to additional structurally non-related protease inhibitors. Recombinant HIVHXB2 proviral clones with G48V, L63P and V82A substitutions showed that one active site mutation was permissible, but the presence of both G48V and V82A substitutions together significantly reduced infectious virus production. Insight into the contributions of the observed substitutions to drug resistance is presented in molecular modelling studies.
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Park J, McDonald JJ, Petter RC, Houk KN. Molecular Dynamics Analysis of Binding of Kinase Inhibitors to WT EGFR and the T790M Mutant. J Chem Theory Comput 2016; 12:2066-78. [PMID: 27010480 DOI: 10.1021/acs.jctc.5b01221] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Epidermal growth factor receptor (EGFR) inhibitors interrupt EGFR-dependent cellular signaling pathways that lead to accelerated tumor growth and proliferation. Mutation of a threonine in the inhibitor binding pocket, known as the "gatekeeper", to methionine (T790M) confers acquired resistance to several EGFR-selective inhibitors. We studied interactions between EGFR inhibitors and the gatekeeper residues of the target protein. Thermodynamic integration (TI) with Amber14 indicates that the binding energies of gefitinib and AEE788 to the active state of the T790M mutant EGFR is 3 kcal/mol higher than to the wild type (WT), whereas ATP binding energy to the mutant is similar to the WT. Using metadynamics MD simulations with NAMD v2.9, the conformational equilibrium between the inactive resting state and the catalytically competent activate state was determined for the WT EGFR. When combined with the results obtained by Sutto and Gervasio, our simulations showed that the T790M point mutation lowers the free energy of the active state by 5 kcal/mol relative to the inactive state of the enzyme. Relative to the WT, the T790M mutant binds gefitinib more strongly. The T790M mutation is nevertheless resistant due to its increased binding of ATP. By contrast, the binding of AEE788 to the active state causes a conformational change in the αC-helix adjacent to the inhibitor binding pocket, that results in a 2 kcal/mol energy penalty. The energy penalty explains why the binding of AEE788 to the T790M mutant is unfavorable relative to binding to WT EGFR. These results establish the role of the gatekeeper mutation on inhibitor selectivity. Additional molecular dynamics (MD) simulations, TI, and metadynamics MD simulations reveal the origins of the changes in binding energy of WT and mutants.
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Park J, McDonald JJ, Petter RC, Houk K. The Influences of Drug-Resistant Mutations of EGFR to the Inhibitor Binding Affinity and the Drug Target Selectivity Profiles. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.2910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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McDonald JJ, Bisset C, Coleman MG, Speake D, Brady RRW. Contemporary use of social media by consultant colorectal surgeons. Colorectal Dis 2015; 17:165-71. [PMID: 25213268 DOI: 10.1111/codi.12780] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Accepted: 08/13/2014] [Indexed: 02/08/2023]
Abstract
AIM There is evidence of significant growth in the engagement of UK health-care professionals with 'open' social media platforms, such as Twitter and LinkedIn. Social media communication provides many opportunities and benefits for medical education and interaction with patients and colleagues. This study was undertaken to evaluate the uptake of public social media membership and the characteristics of use of such media channels amongst contemporary UK consultant colorectal surgeons. METHOD Colorectal surgeons were identified from the Association of Coloproctology of Great Britain and Ireland (ACPGBI) national registry of colorectal mortality outcomes and were cross-referenced with the General Medical Council (GMC) register. Individuals were identified by manual searching on a number of social media platforms. Matching accounts were then examined to confirm ownership and to evaluate key markers of use. RESULTS Six-hundred and eighteen individual consultant colorectal surgeons from 142 health authorities were studied (79.5% were ACPGBI members and 90.8% were male). Two-hundred and twenty-nine (37.1%) had LinkedIn profiles (37.7% male surgeons, 29.8% female surgeons; P = 0.2530). LinkedIn membership was significantly higher in ACPGBI members (P < 0.001) and in those with GMC registration before 1997 vs after this date (39% before 1997 vs 30% after 1997; P = 0.03). LinkedIn members had a mean of 62 connections (median = 22), and 19 (3.1%) surgeons had Twitter profiles with a mean of 82 (median = 16; range: 0-914) followers and their accounts were followed by a mean of 87 (median = 27; range: 0-642) persons. CONCLUSION UK consultant colorectal surgeons are less engaged with social media than reported studies from other health-care professional groups. Further education and appropriate guidance on usage may encourage uptake and confidence, particularly in younger consultants.
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Xing L, McDonald JJ, Kolodziej SA, Kurumbail RG, Williams JM, Warren CJ, O’Neal JM, Skepner JE, Roberds SL. Discovery of Potent Inhibitors of Soluble Epoxide Hydrolase by Combinatorial Library Design and Structure-Based Virtual Screening. J Med Chem 2011; 54:1211-22. [PMID: 21302953 DOI: 10.1021/jm101382t] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Becker DP, Barta TE, Bedell LJ, Boehm TL, Bond BR, Carroll J, Carron CP, Decrescenzo GA, Easton AM, Freskos JN, Funckes-Shippy CL, Heron M, Hockerman S, Howard CP, Kiefer JR, Li MH, Mathis KJ, McDonald JJ, Mehta PP, Munie GE, Sunyer T, Swearingen CA, Villamil CI, Welsch D, Williams JM, Yu Y, Yao J. Orally active MMP-1 sparing α-tetrahydropyranyl and α-piperidinyl sulfone matrix metalloproteinase (MMP) inhibitors with efficacy in cancer, arthritis, and cardiovascular disease. J Med Chem 2010; 53:6653-80. [PMID: 20726512 DOI: 10.1021/jm100669j] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
α-Sulfone-α-piperidine and α-tetrahydropyranyl hydroxamates were explored that are potent inhibitors of MMP's-2, -9, and -13 that spare MMP-1, with oral efficacy in inhibiting tumor growth in mice and left-ventricular hypertrophy in rats and in the bovine cartilage degradation ex vivo explant system. α-Piperidine 19v (SC-78080/SD-2590) was selected for development toward the initial indication of cancer, while α-piperidine and α-tetrahydropyranyl hydroxamates 19w (SC-77964) and 9i (SC-77774), respectively, were identified as backup compounds.
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Kolodziej SA, Hockerman SL, DeCrescenzo GA, McDonald JJ, Mischke DA, Munie GE, Fletcher TR, Stehle N, Swearingen C, Becker DP. MMP-13 selective isonipecotamide α-sulfone hydroxamates. Bioorg Med Chem Lett 2010; 20:3561-4. [DOI: 10.1016/j.bmcl.2010.04.111] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 04/23/2010] [Accepted: 04/26/2010] [Indexed: 11/24/2022]
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Kolodziej SA, Hockerman SL, Boehm TL, Carroll JN, DeCrescenzo GA, McDonald JJ, Mischke DA, Munie GE, Fletcher TR, Rico JG, Stehle NW, Swearingen C, Becker DP. Orally bioavailable dual MMP-1/MMP-14 sparing, MMP-13 selective alpha-sulfone hydroxamates. Bioorg Med Chem Lett 2010; 20:3557-60. [PMID: 20529684 DOI: 10.1016/j.bmcl.2010.04.130] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 04/23/2010] [Accepted: 04/27/2010] [Indexed: 01/14/2023]
Abstract
A series of phenyl piperidine alpha-sulfone hydroxamate derivatives has been prepared utilizing a combination of solution-phase and resin-bound library technologies to afford compounds that are potent and highly selective for MMP-13, are dual-sparing of MMP-1 and MMP-14 (MT1-MMP) and exhibit oral bioavailability in rats.
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Freskos JN, Fobian YM, Benson TE, Moon JB, Bienkowski MJ, Brown DL, Emmons TL, Heintz R, Laborde A, McDonald JJ, Mischke BV, Molyneaux JM, Mullins PB, Bryan Prince D, Paddock DJ, Tomasselli AG, Winterrowd G. Design of potent inhibitors of human β-secretase. Part 2. Bioorg Med Chem Lett 2007; 17:78-81. [PMID: 17049233 DOI: 10.1016/j.bmcl.2006.09.091] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Revised: 09/23/2006] [Accepted: 09/29/2006] [Indexed: 11/29/2022]
Abstract
We describe an optimized series of acyclic hydroxyethylamine transition state isosteres of beta-secretase that incorporates a variety of P(2) side chains that yield potent inhibitors with excellent cellular activity. A 2.2A crystal structure of compound 13 is shown.
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Freskos JN, Fobian YM, Benson TE, Bienkowski MJ, Brown DL, Emmons TL, Heintz R, Laborde A, McDonald JJ, Mischke BV, Molyneaux JM, Moon JB, Mullins PB, Bryan Prince D, Paddock DJ, Tomasselli AG, Winterrowd G. Design of potent inhibitors of human β-secretase. Part 1. Bioorg Med Chem Lett 2007; 17:73-7. [PMID: 17046251 DOI: 10.1016/j.bmcl.2006.09.092] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Revised: 09/23/2006] [Accepted: 09/29/2006] [Indexed: 11/18/2022]
Abstract
We describe a novel series of potent inhibitors of human beta-secretase. These compounds possess the hydroxyethyl amine transition state isostere. A 2.5A crystal structure of inhibitor 32 bound to BACE is provided.
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Teder-Sälejärvi WA, Di Russo F, McDonald JJ, Hillyard SA. Effects of spatial congruity on audio-visual multimodal integration. J Cogn Neurosci 2006; 17:1396-409. [PMID: 16197693 DOI: 10.1162/0898929054985383] [Citation(s) in RCA: 154] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Spatial constraints on multisensory integration of auditory (A) and visual (V) stimuli were investigated in humans using behavioral and electrophysiological measures. The aim was to find out whether cross-modal interactions between A and V stimuli depend on their spatial congruity, as has been found for multisensory neurons in animal studies (Stein & Meredith, 1993). Randomized sequences of unimodal (A or V) and simultaneous bimodal (AV) stimuli were presented to right- or left-field locations while subjects made speeded responses to infrequent targets of greater intensity that occurred in either or both modalities. Behavioral responses to the bimodal stimuli were faster and more accurate than to the unimodal stimuli for both same-location and different-location AV pairings. The neural basis of this cross-modal facilitation was studied by comparing event-related potentials (ERPs) to the bimodal AV stimuli with the summed ERPs to the unimodal A and V stimuli. These comparisons revealed neural interactions localized to the ventral occipito-temporal cortex (at 190 msec) and to the superior temporal cortical areas (at 260 msec) for both same- and different-location AV pairings. In contrast, ERP interactions that differed according to spatial congruity included a phase and amplitude modulation of visual-evoked activity localized to the ventral occipito-temporal cortex at 100-400 msec and an amplitude modulation of activity localized to the superior temporal region at 260-280 msec. These results demonstrate overlapping but distinctive patterns of multisensory integration for spatially congruent and incongruent AV stimuli.
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Becker DP, Villamil CI, Barta TE, Bedell LJ, Boehm TL, Decrescenzo GA, Freskos JN, Getman DP, Hockerman S, Heintz R, Howard SC, Li MH, McDonald JJ, Carron CP, Funckes-Shippy CL, Mehta PP, Munie GE, Swearingen CA. Synthesis and Structure−Activity Relationships of β- and α-Piperidine Sulfone Hydroxamic Acid Matrix Metalloproteinase Inhibitors with Oral Antitumor Efficacy. J Med Chem 2005; 48:6713-30. [PMID: 16220987 DOI: 10.1021/jm0500875] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
alpha-Piperidine-beta-sulfone hydroxamate derivatives were explored that are potent for matrix metalloproteinases (MMP)-2, -9, and -13 and are sparing of MMP-1. The investigation of the beta-sulfones subsequently led to the discovery of hitherto unknown alpha-sulfone hydroxamates that are superior to the corresponding beta-sulfones in potency for target MMPs, selectivity vs MMP-1, and exposure when dosed orally. alpha-Piperidine-alpha-sulfone hydroxamate 35f (SC-276) was advanced through antitumor and antiangiogenesis assays and was selected for development. Compound 35f demonstrates excellent antitumor activity vs MX-1 breast tumor in mice when dosed orally as monotherapy or in combination with paclitaxel.
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Kroemer RT, Vulpetti A, McDonald JJ, Rohrer DC, Trosset JY, Giordanetto F, Cotesta S, McMartin C, Kihlén M, Stouten PFW. Assessment of Docking Poses: Interactions-Based Accuracy Classification (IBAC) versus Crystal Structure Deviations. ACTA ACUST UNITED AC 2004; 44:871-81. [PMID: 15154752 DOI: 10.1021/ci049970m] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Six docking programs (FlexX, GOLD, ICM, LigandFit, the Northwestern University version of DOCK, and QXP) were evaluated in terms of their ability to reproduce experimentally observed binding modes (poses) of small-molecule ligands to macromolecular targets. The accuracy of a pose was assessed in two ways: First, the RMS deviation of the predicted pose from the crystal structure was calculated. Second, the predicted pose was compared to the experimentally observed one regarding the presence of key interactions with the protein. The latter assessment is referred to as interactions-based accuracy classification (IBAC). In a number of cases significant discrepancies were found between IBAC and RMSD-based classifications. Despite being more subjective, the IBAC proved to be a more meaningful measure of docking accuracy in all these cases.
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Nagarajan SR, De Crescenzo GA, Getman DP, Lu HF, Sikorski JA, Walker JL, McDonald JJ, Houseman KA, Kocan GP, Kishore N, Mehta PP, Funkes-Shippy CL, Blystone L. Discovery of novel benzothiazolesulfonamides as potent inhibitors of HIV-1 protease. Bioorg Med Chem 2003; 11:4769-77. [PMID: 14556792 DOI: 10.1016/j.bmc.2003.07.001] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The human immunodeficiency virus (HIV) has been shown to be the causative agent for AIDS. The HIV virus encodes for a unique aspartyl protease that is essential for the production of enzymes and proteins in the final stages of maturation. Protease inhibitors have been useful in combating the disease. The inhibitors incorporate a variety of isosteres including the hydroxyethylurea at the protease cleavage site. We have shown that the replacement of t-butylurea moiety by benzothiazolesulfonamide provided inhibitors with improved potency and antiviral activities. Some of the compounds have shown good oral bioavailability and half-life in rats. The synthesis of benzothiazole derivatives led us to explore other heterocycles. During the course of our studies, we also developed an efficient synthesis of benzothiazole-6-sulfonic acid via a two-step procedure starting from sulfanilamide.
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Feng Y, Likos JJ, Zhu L, Woodward H, Munie G, McDonald JJ, Stevens AM, Howard CP, De Crescenzo GA, Welsch D, Shieh HS, Stallings WC. Solution structure and backbone dynamics of the catalytic domain of matrix metalloproteinase-2 complexed with a hydroxamic acid inhibitor. BIOCHIMICA ET BIOPHYSICA ACTA 2002; 1598:10-23. [PMID: 12147339 DOI: 10.1016/s0167-4838(02)00307-2] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
MMP-2 is a member of the matrix metalloproteinase family that has been implicated in tumor cell metastasis and angiogenesis. Here, we describe the solution structure of a catalytic domain of MMP-2 complexed with a hydroxamic acid inhibitor (SC-74020), determined by three-dimensional heteronuclear NMR spectroscopy. The catalytic domain, designated MMP-2C, has a short peptide linker replacing the internal fibronectin-domain insertion and is enzymatically active. Distance geometry-simulated annealing calculations yielded 14 converged structures with atomic root-mean-square deviations (r.m.s.d.) of 1.02 and 1.62 A from the mean coordinate positions for the backbone and for all heavy atoms, respectively, when 11 residues at the N-terminus are excluded. The structure has the same global fold as observed for other MMP catalytic domains and is similar to previously solved crystal structures of MMP-2. Differences observed between the solution and the crystal structures, near the bottom of the S1' specificity loop, appear to be induced by the large inhibitor present in the solution structure. The MMP-2C solution structure is compared with MMP-8 crystal structure bound to the same inhibitor to highlight the differences especially in the S1' specificity loop. The finding provides a structural explanation for the selectivity between MMP-2 and MMP-8 that is achieved by large inhibitors.
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Teder-Sälejärvi WA, McDonald JJ, Di Russo F, Hillyard SA. An analysis of audio-visual crossmodal integration by means of event-related potential (ERP) recordings. BRAIN RESEARCH. COGNITIVE BRAIN RESEARCH 2002; 14:106-14. [PMID: 12063134 DOI: 10.1016/s0926-6410(02)00065-4] [Citation(s) in RCA: 224] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Crossmodal integration was studied in humans by presenting random sequences of auditory (brief noise bursts), visual (flashes), and audiovisual (simultaneous noise bursts and flashes) stimuli from a central location at irregular intervals between 600 and 800 ms. The subjects' task was to press a button to infrequent and unpredictable (P=0.15) target stimuli that could be either a more intense noise burst, a brighter flash, or a combination of the two. In accordance with previous studies, behavioral data showed that bimodal target stimuli were responded to much faster and were identified more accurately than the unimodal target stimuli. The neural basis of this crossmodal interaction was investigated by subtracting the ERPs to the auditory (A) and the visual (V) stimuli alone from the ERP to the combined audiovisual (AV) stimuli (i.e. interaction=AV-(A+V)). Using this approach, we replicated previous reports of both early (at around 40 ms) and late (after 100 ms) ERP interaction effects. However, it appears that the very early interaction effects can be largely accounted for by an anticipatory ERP that precedes both the unimodal and bimodal stimuli. In calculating the ERP interaction this slow shift is subtracted twice, resulting in an apparent shift of the opposite polarity that may be confounded with actual crossmodal interactions.
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McDonald JJ, Brooks CL. Theoretical approach to drug design. 2. Relative thermodynamics of inhibitor binding by chicken dihydrofolate reductase to ethyl derivatives of trimethoprim substituted at 3'-, 4'-, and 5'-positions. J Am Chem Soc 2002. [DOI: 10.1021/ja00006a058] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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McDonald JJ, Brooks CL. A theoretical approach to drug design. 3. Relative thermodynamics of inhibitor binding by E. coli dihydrofolate reductase to ethyl derivatives of trimethoprim substituted at the 3', 4', and 5' positions. J Am Chem Soc 2002. [DOI: 10.1021/ja00032a020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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