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1.
Curr Pharm Teach Learn ; 16(1): 64-68, 2024 01.
Artigo em Inglês | MEDLINE | ID: mdl-38158324

RESUMO

BACKGROUND AND PURPOSE: Engaging in therapeutic lifestyle changes (TLC) such as healthy eating and physical activity can help prevent or manage various conditions. This study's purpose is to describe a TLC elective course and examine its impact on student knowledge, empathy, and perceptions of confidence with lifestyle modifications counseling. EDUCATIONAL ACTIVITY AND SETTING: An elective was developed to increase student pharmacists' knowledge and confidence in educating patients about lifestyle modifications. Activities were intended to foster student empathy. A questionnaire, given at course initiation and conclusion, incorporated a knowledge quiz and Kiersma-Chen Empathy Scale (KCES). Student perceptions of confidence were assessed at course conclusion. FINDINGS: Knowledge significantly increased (P < .001) from 54.1% at course initiation to 75% at course conclusion when comparing average quiz scores. Average KCES scores (out of 105 points) were 84.9 (n = 26) and 86 (n = 22) at course initiation and conclusion, respectively, showing no significant change in empathy scores (P = .01). For each course topic, most students reported being somewhat or very confident in their TLC counseling abilities at course conclusion. SUMMARY: An elective course significantly improved TLC knowledge and perceived confidence regarding TLC counseling was high at course conclusion. Although there was no significant change in KCES scores, including dedicated TLC instruction in pharmacy curricula can help students build knowledge and confidence in TLC counseling in preparation for pharmacy practice.


Assuntos
Educação em Farmácia , Estudantes de Farmácia , Humanos , Empatia , Estilo de Vida , Currículo , Estudantes de Farmácia/psicologia
2.
Molecules ; 28(15)2023 Jul 28.
Artigo em Inglês | MEDLINE | ID: mdl-37570703

RESUMO

Six new sesquiterpene coumarin ethers, namely turcicanol A (1), turcicanol A acetate (2), turcicanol B (3), turcica ketone (4), 11'-dehydrokaratavicinol (5), and galbanaldehyde (6), and one new sulfur-containing compound, namely turcicasulphide (7), along with thirty-two known secondary metabolites were isolated from the root of the endemic species Ferula turcica Akalin, Miski, & Tuncay through a bioassay-guided isolation approach. The structures of the new compounds were elucidated by spectroscopic analysis and comparison with the literature. Cell growth inhibition of colon cancer cell lines (COLO205 and HCT116) and kidney cancer cell lines (UO31 and A498) was used to guide isolation. Seventeen of the compounds showed significant activity against the cell lines.


Assuntos
Anestésicos Gerais , Antineoplásicos Fitogênicos , Antineoplásicos , Ferula , Sesquiterpenos , Ferula/química , Compostos de Enxofre/análise , Estrutura Molecular , Éteres , Antineoplásicos Fitogênicos/farmacologia , Antineoplásicos/análise , Cumarínicos/química , Sesquiterpenos/química , Enxofre/análise , Raízes de Plantas/química
3.
Curr Pharm Teach Learn ; 15(5): 488-493, 2023 05.
Artigo em Inglês | MEDLINE | ID: mdl-37127463

RESUMO

BACKGROUND AND PURPOSE: This study evaluated the perceived impact of using Flip (Microsoft Corp.) to facilitate a group project in a socially distanced environment. EDUCATIONAL ACTIVITY AND SETTING: Student groups were assigned a self-care scenario, and students independently traveled to local pharmacies to identify a pertinent nonprescription product. Students individually recorded a review of the product using Flip. Subsequently, students reviewed and replied to group member videos to compare products. Students worked as a group to develop consensus regarding the most appropriate product recommendation for their scenario. At semester end, students completed a questionnaire about their experiences using Flip for the project. FINDINGS: Sixty-eight students (91%) completed the perceptions questionnaire at course conclusion. Students found Flip enjoyable (68%) and easy to use (74%). The majority of students (82%) viewed all of their group members' Flip videos, and most (88%) agreed or strongly agreed Flip facilitated group work in a socially distanced environment. SUMMARY: Students overall perceived Flip as enjoyable and easy to use. Though utilization of Flip was initially due social distancing requirements, the positive student feedback encouraged continued use of this platform asynchronously. Flip provides a unique mechanism for facilitating group projects in multiple different environments.


Assuntos
Medicamentos sem Prescrição , Estudantes , Humanos , Inquéritos e Questionários
4.
Curr Pharm Teach Learn ; 14(4): 457-461, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-35483811

RESUMO

INTRODUCTION: Studies have examined the impact of team formation strategies to performance on team assessments and perceptions of team dynamics. This study assessed the impact of intentional vs. randomized team formation strategies on a semester-long self-care pharmacotherapy course taught using team-based learning. METHODS: Students were intentionally assigned to teams in fall 2018 and randomized to teams in fall 2019. Performance on team readiness assessment tests (TRATs) was compared. Student perceptions regarding team dynamics were evaluated using a questionnaire. RESULTS: The were no significant differences in TRAT scores between the intentional (n = 91; average 99.8%) and randomized (n = 68; average 99.9%) cohorts (P = .33). Response rates for the student perception questionnaires for the intentional and randomized cohorts were 85.7% and 77.9%, respectively. No significant differences existed between cohorts for any questionnaire items. CONCLUSIONS: The type and number of criteria used to intentionally develop teams has varied across the literature and has generally failed to show significant differences in performance on team assessments regardless of team formation strategy. There have been varied findings with respect to the impact of team formation criteria on student perceptions related to team dynamics. In this study, intentionally assigning teams in a single semester-long course primarily using community pharmacy experience and significant relationships did not produce significant differences in team performance or student perceptions compared to randomization. For teams in a single semester course, randomization may be an efficient way of assigning students to teams without negatively impacting team performance or perceptions of team dynamics.


Assuntos
Educação em Farmácia , Estudantes de Farmácia , Currículo , Educação em Farmácia/métodos , Avaliação Educacional/métodos , Humanos , Autocuidado
5.
Curr Pharm Teach Learn ; 14(2): 245-249, 2022 02.
Artigo em Inglês | MEDLINE | ID: mdl-35190169

RESUMO

Background Limited literature is available evaluating retrospective student perceptions of the utility of a postgraduate preparation elective at graduation and career onset and its impact on residency match rates. This project sought to explore the perceived usefulness of a third-year elective course from 2016 to 2019 on post-graduation preparation and to compare the match rate of students enrolled vs. not enrolled in the elective. Impact The majority of students pursuing residency programs (94%) perceived the elective course as helpful in navigating the postgraduate training process. Of the students pursuing other employment, 77.8% found the elective to be helpful in navigating the employment process. The top five activities identified as most useful included: cover letters, letters of intent, and thank you cards overview; curriculum vitae workshop; interviewing tips; mock interviews; and overview of postgraduate training opportunities. The match rate was not statistically different between those who completed the elective (60.7%) vs. all school graduates (64.7%) (P =.70). Recommendations Consideration should be given to the topics to be included in this type of elective course depending on the targeted audience. Additionally, it may be more beneficial to introduce these types of topics and activities to students earlier in their didactic career and integrate them into different parts of the curriculum. Discussion The post-graduation preparation elective course was perceived positively by students in terms of preparing for their postgraduate plans. Limitations and confounders make it difficult to determine the true impact of this type of elective on successful residency match rates.


Assuntos
Internato e Residência , Estudantes de Farmácia , Humanos , Estudos Retrospectivos
6.
Curr Pharm Teach Learn ; 13(10): 1358-1362, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-34521532

RESUMO

BACKGROUND AND PURPOSE: Students visiting local pharmacies can enhance their learning about nonprescription products while improving their understanding of the patient self-care experience. This study was designed to examine student perceptions of an activity utilizing Flipgrid to share a simulated patient experience in the nonprescription aisle. EDUCATIONAL ACTIVITY AND SETTING: Student groups traveled to local pharmacies to review available products pertaining to a self-care scenario. Students submitted brief video recordings with product recommendations and counseling points via the Flipgrid platform. Following the activity, students submitted brief reflections. At course conclusion, students completed a questionnaire regarding perceptions of Flipgrid. FINDINGS: Sixty-eight students completed the activity. Response rates were 91.2% for the project reflection and 79.4% for the Flipgrid questionnaire. In the reflections (n = 62), the majority of students (87.1%) found it easy or extremely easy to locate pertinent nonprescription products; no student found it extremely difficult. All except four students indicated the assignment helped develop empathy, and all except two indicated a greater likelihood to help a patient in the aisle. In the Flipgrid questionnaire (n = 54), most students found the platform enjoyable (74.1%) and easy to use (79.6%). SUMMARY: Students perceived that the project increased empathy for assisting patients with selection of nonprescription products. Students found the Flipgrid platform enjoyable and easy to use. This activity can be utilized to simulate a patient self-care experience, and the Flipgrid platform is a novel way to share information between student groups in pharmacy education.


Assuntos
Educação em Farmácia , Estudantes de Farmácia , Humanos , Medicamentos sem Prescrição/uso terapêutico , Avaliação de Resultados da Assistência ao Paciente , Autocuidado
7.
J Enzyme Inhib Med Chem ; 35(1): 1953-1963, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-33143469

RESUMO

Bioisosteric replacement and scaffold hopping are powerful strategies in drug design useful for rationally modifying a hit compound towards novel lead therapeutic agents. Recently, we reported a series of thienopyrimidinones that compromise dynamics at the p66/p51 HIV-1 reverse transcriptase (RT)-associated Ribonuclease H (RNase H) dimer interface, thereby allosterically interrupting catalysis by altering the active site geometry. Although they exhibited good submicromolar activity, the isosteric replacement of the thiophene ring, a potential toxicophore, is warranted. Thus, in this article, the most active 2-(3,4-dihydroxyphenyl)-5,6-dimethylthieno[2,3-d]pyrimidin-4(3H)-one 1 was selected as the hit scaffold and several isosteric substitutions of the thiophene ring were performed. A novel series of highly active RNase H allosteric quinazolinone inhibitors was thus obtained. To determine their target selectivity, they were tested against RT-associated RNA-dependent DNA polymerase (RDDP) and integrase (IN). Interestingly, none of the compounds were particularly active on (RDDP) but many displayed micromolar to submicromolar activity against IN.


Assuntos
Fármacos Anti-HIV/síntese química , Transcriptase Reversa do HIV/metabolismo , Pirimidinonas/química , Quinazolinonas/síntese química , Inibidores da Transcriptase Reversa/síntese química , Ribonuclease H do Vírus da Imunodeficiência Humana/antagonistas & inibidores , Fármacos Anti-HIV/farmacologia , Domínio Catalítico , Desenho de Fármacos , Humanos , Modelos Moleculares , Ligação Proteica , Multimerização Proteica , Quinazolinonas/farmacologia , Inibidores da Transcriptase Reversa/farmacologia , Relação Estrutura-Atividade , Tiofenos/química
8.
J Am Pharm Assoc (2003) ; 60(5S): S15-S22, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32280022

RESUMO

OBJECTIVES: To determine patient and prescriber perceptions of depression screening within the community pharmacy setting and to assess the best strategies for patient engagement and care coordination. DESIGN: Qualitative semistructured key informant interviews using the Consolidated Framework for Implementation Research as a theoretical framework. SETTING AND PARTICIPANTS: A community pharmacy in the metropolitan Piedmont region of North Carolina from February 2019 to May 2019. Prescriber and patient interviews were audio recorded, transcribed, and independently coded by 2 investigators. A qualitative analysis was completed, with a selection of supporting quotations for each theme. OUTCOME MEASURES: Qualitative analysis of prescriber and patient perceptions of depression screening provided in community pharmacies, strategies for patient engagement, and coordination of care for depression screenings. RESULTS: Twelve patients and 4 prescribers participated in the study. The patient perceptions were categorized into 3 key themes: (1) private and confidential screenings; (2) disparate views regarding the potential interventions that pharmacists could offer; and (3) mental health stigma concerns. The prescriber perceptions were categorized into 3 key themes: (1) support for expanded access to depression screenings provided in community pharmacies; (2) necessity of referral algorithms for transitions of care; and (3) communication of full screening results for positive and negative screens. A mutual theme was identified among patients and prescribers: the view that mental health care provided at a community pharmacy was influenced by an established relationship with a community pharmacist. CONCLUSION: This study describes patient and provider perceptions of depression screening within the community pharmacy setting. Prescribers were supportive of community pharmacists' ability to close the gaps in access to care for patients with mental health conditions, whereas patients had mixed feelings that may have been influenced by concerns of privacy, confidentiality, and stigma. This deeper understanding of prescriber and patient perceptions of how community pharmacies could expand access to depression screening may provide a roadmap for offering these interventions in community pharmacies.


Assuntos
Serviços Comunitários de Farmácia , Farmácias , Atitude do Pessoal de Saúde , Depressão/diagnóstico , Humanos , North Carolina , Percepção , Farmacêuticos
9.
Curr Pharm Teach Learn ; 11(12): 1287-1295, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31836155

RESUMO

BACKGROUND AND PURPOSE: To examine the educational outcomes comparing flipped classroom method versus a didactic method with active learning in two semesters of a modified team-based learning (TBL) self-care pharmacotherapy course and explore student-identified preferences for teaching modality. EDUCATIONAL ACTIVITY AND SETTING: Grade performance on readiness assurance processes, both individual (iRAP) and team (tRAP), and exam questions were compared in two semester-long course offerings. Additionally, students were surveyed pre- and post-course. FINDINGS: The mean iRAP scores were 81.9% for the didactic method and 80.7% for the flipped method (p = .092). The mean tRAP scores were 93.6% for both didactic and flipped methods (p = .979). Mean exam performance for content taught using didactic and flipped methods were 83.3% and 83.5%, respectively (p = .730). Pre-course respondents indicated the following preferences: didactic (27.7%), flipped (9%), combination (58.2%), no preference (5.1%). Post-course, 46.8% preferred didactic, 5.7% preferred flipped, and 47.5% preferred a combination. Respondents perceived the didactic method helped develop deeper understanding, stimulated greater interest, and improved retention; however, they felt the flipped method improved critical thinking and application. SUMMARY: There were no statistically significant differences in student outcomes comparing teaching methods while student preference for the flipped classroom decreased.


Assuntos
Tratamento Farmacológico/métodos , Autocuidado/métodos , Ensino/normas , Currículo/tendências , Tratamento Farmacológico/estatística & dados numéricos , Avaliação Educacional/métodos , Humanos , Aprendizagem Baseada em Problemas , Autocuidado/estatística & dados numéricos , Inquéritos e Questionários , Ensino/estatística & dados numéricos
10.
Curr Pharm Teach Learn ; 10(9): 1272-1279, 2018 09.
Artigo em Inglês | MEDLINE | ID: mdl-30497631

RESUMO

BACKGROUND AND PURPOSE: To determine if a disease state simulation assignment increases empathy, comfort, and knowledge in diabetes nutrition counseling. EDUCATIONAL ACTIVITY AND SETTING: One-hundred forty students completing ambulatory care experiential rotations over two academic years were invited to participate in the study. Students in the intervention group completed an empathy assignment, which involved developing and following a diet plan appropriate for a patient with diabetes followed by a reflection of their experiences. Students completed a pre- and post-intervention survey assessing empathy, comfort with counseling, and knowledge of diabetes nutrition. FINDINGS: Fifty-three students (31 in the intervention, 22 in the non-intervention group) completed the pre- and post-survey and provided informed consent. Empathy scores on the Kiersma Chen Empathy Scale (range 15-105) improved by 6.4 points in students in the intervention group compared to a decline of 1.2 in students in the non-intervention group (p = 0.045). Comfort in counseling on a diabetes diet, measured on a 10-point scale, increased significantly more in students completing the empathy assignment (4.7 vs 3.5; p = 0.044). Knowledge (0-100%) improved by 9.7% and 8.6% in the intervention and non-intervention groups, respectively (p = 0.859). DISCUSSION: Similar to other studies using disease state simulations, the findings of this study show increased confidence in counseling and empathy. Given that the assignment used in this study is more specific to nutrition counseling, its use may be most helpful in settings where pharmacists are responsible for diabetes nutrition counseling. SUMMARY: Implementation of a similar assignment could be considered for experiential rotations with nutrition counseling.


Assuntos
Aconselhamento/educação , Diabetes Mellitus/dietoterapia , Empatia , Simulação de Paciente , Estudantes de Farmácia/psicologia , Adulto , Atitude do Pessoal de Saúde , Aconselhamento/métodos , Educação em Farmácia/métodos , Feminino , Humanos , Masculino , Psicometria/instrumentação , Psicometria/métodos , Psicometria/estatística & dados numéricos , Estudantes de Farmácia/estatística & dados numéricos , Inquéritos e Questionários
11.
Curr Pharm Teach Learn ; 9(6): 1151-1159, 2017 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-29233385

RESUMO

BACKGROUND AND PURPOSE: To determine if traditional didactic lecture or the jigsaw learning method is more effective to teach the medication therapy management (MTM) core elements in a first year pharmacy course. EDUCATIONAL ACTIVITY AND SETTING: Traditional didactic lecture and a pre-class reading assignment were used in the fall semester cohort, and the jigsaw method was used in the spring semester cohort. Jigsaw is a cooperative learning strategy requiring students to assume responsibility for learning, and subsequently teaching peers. The students were responsible for reading specific sections of the pre-class reading, and then teaching other students in small groups about their specific reading assignments. To assess potential differences, identical pre- and post-tests were administered before and after the MTM section. Additionally, grade performance on an in-class project and final exam questions were compared, and students were surveyed on perceptions of teaching method used. FINDINGS: A total of 45 and 43 students completed both the pre- and post-test in the fall and spring (96% and 93% response rate), respectively. Improvement in post-test scores favored the traditional method (p = 0.001). No statistical differences were noted between groups with grade performance on the in-class project and final exam questions. However, students favored the jigsaw method over traditional lecture and perceived improvements in problem solving skills, listening/communication skills and encouragement of cooperative learning (p = 0.018, 0.025 and 0.031). SUMMARY: Although students favored the jigsaw learning method, traditional didactic lecture was more effective for the pre- and post-knowledge test performance. This may indicate that traditional didactic lecture is more effective for more foundational content.


Assuntos
Conduta do Tratamento Medicamentoso/educação , Percepção , Estudantes de Farmácia/psicologia , Ensino/normas , Adulto , Currículo/normas , Educação em Farmácia , Avaliação Educacional/métodos , Feminino , Humanos , Masculino , Inquéritos e Questionários
12.
Curr Pharm Teach Learn ; 9(4): 713-718, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-29233447

RESUMO

BACKGROUND AND PURPOSE: Mentorship programs can play a significant role in the professional development of a variety of individuals, including student pharmacists and practitioners. Many mentorship programs have been described in the literature, but the literature pertaining to mentorship programs for student pharmacists specifically is varied. EDUCATIONAL ACTIVITY AND SETTING: A leadership society at one school of pharmacy established a formal mentorship program to aid the professional development of student pharmacists. This year-long program matched third-year student pharmacists with practicing pharmacists. This paper describes the development of the program, along with perceived benefits and challenges associated with implementation. FINDINGS: The mentor (n=8) and mentee (n=17) respondents provided positive feedback (100% and 94%, respectively) regarding the mentorship program. Most mentors and mentees noted they enjoyed having the opportunity to network and gained different perspectives on issues related to pharmacy. The challenges most noted by both the mentors and mentees were time limitations and scheduling conflicts. More consistent communication between mentors and mentees was noted as an area of improvement for future programs. DISCUSSION: The described program may create avenues to achieve professional development elements of the 2016 Accreditation Council for Pharmacy Education (ACPE) Standards and 2013 Center for Advancement of Pharmacy Education (CAPE) Outcomes. Continued, regular evaluation is important to help with process improvement, address challenges, and ensure the program is meeting desired objectives. Adjustments may be needed based on participant feedback, available resources, and student interest. SUMMARY: Overall, the program was successful, helping participants grow personally and professionally. With modifications, other institutions may utilize this data to develop similar programs.


Assuntos
Mentores/educação , Percepção , Desenvolvimento de Pessoal/métodos , Estudantes de Farmácia/psicologia , Educação em Farmácia/métodos , Humanos , Mentores/psicologia , Farmacêuticos/psicologia , Avaliação de Programas e Projetos de Saúde/métodos , Desenvolvimento de Pessoal/tendências
13.
Medchemcomm ; 7(9): 1789-1792, 2016 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-28090282

RESUMO

α-Hydroxytropolones are established inhibitors of several therapeutically relevant binuclear metalloenzymes, and thus lead drug targets for various human diseases. We have leveraged a recently-disclosed three-component oxidopyrylium cycloaddition in the first solid-phase synthesis of α-hydroxytropolones. We also showed that, while minor impurities exist after cleavage and aqueous wash, the semi-crude products display activity in HIV RT-associated RNaseH enzymatic and cell-based assays consistent with pure molecules made in solution phase. These proof-of-principle studies demonstrate the feasibility of solid-phase α-hydroxytropolone synthesis and its potential to serve as a powerful platform for α-hydroxytropolone-based drug discovery and development.

14.
Medchemcomm ; 7(9): 1783-1788, 2016 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-28093576

RESUMO

HIV Reverse Transcriptase-associated ribonuclease H activity is a promising enzymatic target for drug development that has not been successfully targeted in the clinic. While the α-hydroxytropolone-containing natural products ß-thujaplicinol and manicol have emerged as some of the most potent leads described to date, structure-function studies have been limited to the natural products and semi-synthetic derivatives of manicol. Thus, a library of α-hydroxytropolones synthesized through a convenient oxidopyrylium cycloaddition/ring-opening sequence have been tested in in vitro and cell-based assays, and have been analyzed using computational support. These studies reveal new synthetic α-hydroxytropolones that, unlike the natural product leads they are derived from, demonstrate protective antiviral activity in cellular assays.

15.
Curr Pharm Teach Learn ; 8(3): 353-358, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-30070245

RESUMO

OBJECTIVE: Advanced pharmacy practice experiences (APPEs) provide an opportunity for students to showcase health and wellness knowledge and skills attained during didactic education. The primary objective of this study was to assess preceptor perceptions of how well pharmacy year four (PY4) students are prepared to provide guideline-based and patient-specific therapeutic lifestyle change (TLC) counseling at onset of an APPE rotation. A secondary objective included assessment of differences in counseling abilities if the preceptor considered the student normal weight versus overweight or obese, or if they were a known smoker. METHODS: A questionnaire containing Likert questions about perceptions regarding TLC counseling was distributed electronically in October 2014 to 708 PY4 preceptors from two pharmacy schools. Only preceptors who routinely provided TLC counseling were included in data analysis that were done using descriptive statistics. The project was approved by both universities' institutional review boards. RESULTS: The survey was completed by 165 PY4 preceptors (response rate = 23.3%), and 67 met inclusion criteria. Regarding nutrition counseling, a greater percentage of preceptors agreed that students more adequately provided counseling per guidelines (79.1%) versus individual patient needs (62.6%). Preceptors perceived students of normal weight were more likely to provide adequate lifestyle-modification counseling to overweight/obese patients (81%) compared to students that were overweight/obese themselves (69%). Students of normal weight were perceived to be more likely to adequately counsel normal weight patients on lifestyle modifications (81%) compared to students that were overweight/obese (64%). Students who smoked were perceived to adequately counsel about not smoking, though, to a lesser degree than students who were non-smokers. IMPLICATIONS: While students are perceived as adequately equipped to provide guideline-based recommendations, there is room for improvement in providing patient-specific counseling. Additionally, it is perceived that student health status related to weight impacts TLC counseling.

16.
J Nat Prod ; 78(11): 2776-81, 2015 Nov 25.
Artigo em Inglês | MEDLINE | ID: mdl-26467198

RESUMO

A high-throughput screening assay for modulators of Trp53/NF1 mutant astrocytoma cell growth was adapted for use with natural product extracts and applied to a novel collection of prefractionated/partially purified extracts. Screening 68 427 samples identified active fractions from 95 unique extracts, including the terrestrial plant Millettia ichthyotona. Only three of these extracts showed activity in the crude extract form, thus demonstrating the utility of a partial purification approach for natural product screening. The NF1 screening assay was used to guide purification of active compounds from the M. ichthyotona extract, which yielded the two rotenones deguelin (1) and dehydrodeguelin (2). The deguelins have been reported to affect growth of a number of cancer cell lines. They potently inhibited growth of only one of a panel of NF1/Trp53 mutant murine astrocytoma cell lines, possibly related to epigenetic factors, but had no effect on the growth of normal astrocytes. These results suggest the potential utility of deguelins as tools for further investigating NF1 astrocytoma cell growth. These bioprobes were identified only as a result of screening partially purified natural product extracts.


Assuntos
Astrocitoma/tratamento farmacológico , Produtos Biológicos/isolamento & purificação , Produtos Biológicos/farmacologia , Fabaceae/química , Millettia/química , Rotenona/análogos & derivados , Animais , Astrócitos/efeitos dos fármacos , Astrócitos/metabolismo , Produtos Biológicos/química , Ciclo Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Humanos , Camundongos , Estrutura Molecular , Rotenona/química , Rotenona/isolamento & purificação , Rotenona/farmacologia
17.
Tetrahedron Lett ; 56(28): 4215-4219, 2015 Jul 08.
Artigo em Inglês | MEDLINE | ID: mdl-26139946

RESUMO

Two new HIV-inhibitory depsipeptides, stellettapeptins A (1) and B (2), were isolated from an extract of the marine sponge Stelletta sp., collected from northwestern Australia. Structures of these cyclic nonribosomal peptides were elucidated on the basis of extensive NMR data analysis, and chemical degradation and derivatization studies. Stellettapeptins contain numerous nonproteinogenic amino acid residues and they are the first peptides reported to contain a 3-hydroxy-6,8-dimethylnon-4-(Z)-enoic acid moiety. Compounds 1 and 2 potently inhibit infection of human T-lymphoblastoid cells by HIV-1RF with EC50 values of 23 and 27 nM, respectively.

18.
Phytochem Lett ; 7: 42-45, 2014 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-24443661

RESUMO

A neurofibromatosis type 1 (NF1) based bioassay-guided phytochemical investigation on Simarouba berteroana led to the isolation of one new canthin-6-one-9-methoxy-5-O-ß-D-glucopyranoside (1), seven known canthine alkaloids (2-8), two known quassinoids (9-10) and a known neo-lignan (11). The structures of all compounds were established by HRMS, 1D- and 2D-NMR analysis and comparison with previously reported data. Most of the compounds inhibited the proliferation of an Nf1- and p53-deficient mouse glioma cell line at non-cytotoxic concentrations.

19.
J Med Chem ; 56(13): 5436-45, 2013 Jul 11.
Artigo em Inglês | MEDLINE | ID: mdl-23631411

RESUMO

The thienopyrimidinone 5,6-dimethyl-2-(4-nitrophenyl)thieno[2,3-d]pyrimidin-4(3H)-one (DNTP) occupies the interface between the p66 ribonuclease H (RNase H) domain and p51 thumb of human immunodeficiency virus reverse transcriptase (HIV RT), thereby inducing a conformational change incompatible with catalysis. Here, we combined biochemical characterization of 39 DNTP derivatives with antiviral testing of selected compounds. In addition to wild-type HIV-1 RT, derivatives were evaluated with rationally designed, p66/p51 heterodimers exhibiting high-level DNTP sensitivity or resistance. This strategy identified 3',4'-dihydroxyphenyl (catechol) substituted thienopyrimidinones with submicromolar in vitro activity against both wild type HIV-1 RT and drug-resistant variants. Thermal shift analysis indicates that, in contrast to active site RNase H inhibitors, these thienopyrimidinones destabilize the enzyme, in some instances reducing the Tm by 5 °C. Importantly, catechol-containing thienopyrimidinones also inhibit HIV-1 replication in cells. Our data strengthen the case for allosteric inhibition of HIV RNase H activity, providing a platform for designing improved antagonists for use in combination antiviral therapy.


Assuntos
Farmacorresistência Viral/efeitos dos fármacos , Inibidores Enzimáticos/farmacologia , Transcriptase Reversa do HIV/antagonistas & inibidores , Pirimidinonas/farmacologia , Ribonuclease H do Vírus da Imunodeficiência Humana/antagonistas & inibidores , Antivirais/química , Antivirais/farmacologia , Farmacorresistência Viral/genética , Inibidores Enzimáticos/química , Estabilidade Enzimática/efeitos dos fármacos , Transcriptase Reversa do HIV/química , Transcriptase Reversa do HIV/genética , HIV-1/efeitos dos fármacos , HIV-1/enzimologia , HIV-1/genética , Humanos , Modelos Moleculares , Estrutura Molecular , Mutação , Ligação Proteica , Estrutura Terciária de Proteína , Pirimidinonas/química , Inibidores da Transcriptase Reversa/química , Inibidores da Transcriptase Reversa/farmacologia , Ribonuclease H do Vírus da Imunodeficiência Humana/química , Ribonuclease H do Vírus da Imunodeficiência Humana/genética , Temperatura
20.
J Org Chem ; 76(21): 8944-54, 2011 Nov 04.
Artigo em Inglês | MEDLINE | ID: mdl-21942286

RESUMO

We have accomplished a parallel screen of cycloaddition partners for o-quinols utilizing a plate-based microwave system. Microwave irradiation improves the efficiency of retro-Diels-Alder/Diels-Alder cascades of o-quinol dimers which generally proceed in a diastereoselective fashion. Computational studies indicate that asynchronous transition states are favored in Diels-Alder cycloadditions of o-quinols. Subsequent biological evaluation of a collection of cycloadducts has identified an inhibitor of activator protein-1 (AP-1), an oncogenic transcription factor.


Assuntos
Hidroquinonas/química , Fator de Transcrição AP-1/antagonistas & inibidores , Fator de Transcrição AP-1/química , Catálise , Ciclização , Micro-Ondas , Modelos Moleculares , Estrutura Molecular , Estereoisomerismo , Termodinâmica
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