Perillyl alcohol production by engineered heterologous mevalonate pathway in Escherichia coli / 生物工程学报

Perillyl alcohol, [4-isopropylene-1-cyclohexene] methanol, is a monocyclic monoterpene alcohol with special odorous similar to that of linalool and terpineol. It has application potential in pharmaceutical, daily chemical and food industries. In this study, one method for the synthesis of perillyl alcohol through the MVA pathway was studied. First, the MVA metabolic pathway originated from Enterococcus faecalis was constructed in Escherichia coli to synthesize limonene. Limonene was further transformed to perillyl alcohol by the hydroxylation of cytochrome P450 alkane hydroxylase. Furthermore, the shake flask fermentation condition of the engineered E. coli strain was optimized. The results showed that the engineered E. coli could produce about 50.12 mg/L perillyl alcohol through MVA pathway using glucose as raw material. In this study, the method of the MVA pathway for perillyl alcohol synthesis was constructed successfully in engineered E. coli, which provides both theoretical and technical support for terpenoids biosynthesis.

Patient with Recurrent Glioblastoma Responding Favorably to Ketogenic Diet Combined with Intranasal Delivery of Perillyl Alcohol: A Case Report and Literature Review

Introduction Monoterpene perillyl alcohol (POH) is cytotoxic to temozolomideresistant glioma cells, regardless of its O6-methylguanine-methyltransferase (MGMT) promoter methylation status. Moreover, adherence to a ketogenic diet (KD) produced successful outcomes in preclinical and clinical studies in the glioma setting. Case Presentation A 54-year-old Caucasian man had a confirmed diagnosis of refractory glioblastoma multiforme (GBM). The immunohistochemical evaluation was negative for methylation, and failed to detect mutations in the isocitrate dehydrogenase (IDH) 1 and 2 genes. In January 2016, the patient was enrolled in a clinical trial combining daily intranasal delivery of POH in combination with a KD. The KD was administered concomitantly with inhalation of POH (55 mg, 4 times a day) in an uninterrupted administration schedule for 3 months. Results The combination treatment was well-tolerated. The nutritional status and anthropometric measurements of the patient were measured. Adherence to the KD was confirmed by measuring the levels of ketone bodies in the urine. Throughout the treatment, a reduced frequency of seizures was observed. After three months of adherence to the treatment, the patient presented with weight loss, reduced body fat, increased water retention, and a slight increase in bone and muscle mass. A follow-up magnetic resonance imaging (MRI) scan after 3 months of treatment revealed marked reduction of the enhancing lesion. Conclusion Intranasal delivery of POH combined with concomitant adherence to a KD appeared to have a beneficial therapeutic effect in a patient with recurrent GBM. Further studies are needed to evaluate the efficacy of this therapeutic strategy in a larger cohort of treatment-refractory GBM patients.

Introdução O monoterpeno álcool perílico (AP) é citotóxico para linhagens celulares de glioblastoma, independentemente do status do promotor de metilação O6-metilguaninametiltransferase (MGMT). Além disso, a adesão à dieta cetogênica (DC) produziu resultados bem sucedidos em desenho de estudos pré-clínicos e clínicos de glioma. Relato de Caso Homem, 54 anos, caucasiano, com diagnóstico de glioblastoma multiforme (GBM) recidivo. A avaliação imuno-histoquímica foi negativa para metilação e não detectou mutações do gene da isocitrato desidrogenase 1 e 2 (IDH1 IDH2). Em janeiro de 2016, o paciente foi inscrito em um ensaio clínico da administração intranasal diária do AP combinada a DC. A DC foi administrada concomitantemente com inalação de AP (55 mg, 4 vezes ao dia) em um cronograma de administração ininterrupto durante 3 meses. Resultados O tratamento combinado foi bem tolerado. O estado nutricional e as medidas antropométricas do paciente foram avaliadas. Aderência a DC foi confirmada pela presença de corpos cetônicos na urina. Ao longo do tratamento, observou-se redução da frequência de convulsões. Após três meses de adesão ao tratamento, o paciente apresentou perda de peso, redução da gordura corporal, melhor hidratação e um aumento discreto da massa óssea e muscular. O acompanhamento da ressonância magnética após 3 meses de tratamento revelou redução acentuada do volume da lesão. Conclusão A administração intranasal do AP combinada a DC sugere ter um efeito terapêutico benéfico em pacientes com GBM recorrente. São necessários mais estudos para avaliar a eficácia desta estratégia terapêutica em uma coorte maior de pacientes com GBM refratários.

Anti-lung cancer effect and anti-angiogenesis therapy study of perillyl alcohol / 中国免疫学杂志

Objective:To investigate the inhibitory effect of perillyl alcohol (PA) on the proliferation and invasion of tung cancer cell A549,and the influence of PA on tumor angiogenesis was studied.Methods:Different concentrations of PA and erlotinib were added into lung cancer cell A549,the inhibiting effect of drug group on lung cancer cell A549 was found by MTT assay.The inhibiting effect of PA on lung cancer cell A549 invasion was measured by Transwell assay.ROS changes of PA on lung cancer cell A549 was detected by fluorescent.Influence of PA on Caspase-3 activity of lung cancer cell A549 was measured by spectrophotometry,VEGF,HIF-1 α,COX-2 expression in lung cancer cell A549 was measured by Western blot,and the NF-κB activity of lung cancer cell A549 was measured by EMSA.Results:Compared with blank control group,cell growth inhibition rate of PA and erlotinib on lung cancer cell A549 was increasing with the increased concentrations (10,50,100 μ,g/ml),the difference was statistically significant (P＜ 0.05),the invasion ability of lung cancer cell A549 was decreased continuously,the difference was statistically significant (P＜0.05).The ROS level of lung cancer cell A549 had no obvious change with the increasing density of erlotinib,but obviously increased with the increasing concentrations of PA (10,50,100 μg/ml).With the increasing concentrations of PA,the expression of COX-2,VEGF and HIF-1α were continuously decreased.EMSA assay showed that NF-κB was continuously decreased with the increasing concentrations of PA.Conclusion:The antitumor mechanism of PA on lung cancer cell A549 might be related to increase the expression level of ROS and reduce the expression of activity of NF-κB,COX-2,VEGF and HIF-1α with angiogenesis signaling pathway.

Preparation of perillyl alcohol ointment and investigaion on its in vitro transdermal penetration / 中草药

Objective: To prepare perillyl alcohol ointment (PAO) and to investigate its properties and transdermal absorption behavior. Methods: The emulsion method was used to prepare PAO. The morphology, stability, and in vitro release were examined, respectively. The transdermal absorption of PAO was evaluated using Franz diffusion cells and the perillyl alcohol content was determined by HPLC. Results: The optimal prescription of PAO was perillyl alcohol, stearic acid, glyceryl monostearate, white vaseline, lanolin, liquid paraffin, triethanolamine, glycerine, and ethylparaben. The product was a pale yellow semi-solid oil-in-water emulsion with a uniform appearance. The content of perillyl alcohol in ointment was (2.89 ± 0.17)%, the release accumulation in vitro achieved 61.25% in 12 h, and the percutaneous penetration rate was 9.42 μg/(cm2·h). The ointment was not stratified after the centrifugation at 3500 r/min for 30 min, and the product was fairly stable under the condition of storing at 0 and 40°C for 30 d. Conclusion: The prepared PAO with increased skin retention amount could be developed into a novel preparation of perillyl alcohol for focal administration.

Detecção imuno-histoquímica de células apoptóticas em glioblastoma recidivante de paciente tratado com álcool perílico por via inalatória / Immunohistochemical detection of apoptotic cells in a recurrent glioblastoma patient treated with intranasal delivery of perillyl alcohol

Introdução: Estudos in vitro mostram que radioterapia e/ou quimioterapia podem ativar as vias de sinalizaçãodo receptor do fator de crescimento epidérmico (EGFR) e Ras, aumentando a resistência cruzada dascélulas de glioblastomas multiformes (GBM) ao tratamento. A inibição das atividades de EGFR e Rasatravés de inibidores tirosinas cinases elimina o antagonismo observado à administração seqüencialdestas modalidades terapêuticas, induzindo apoptose nestas células. Em estudo prévio demonstramosque o tratamento com o álcool perílico (AP), inibidor da farnesilação da Ras, induz apoptose em linhagenscelulares e células de explante de GBM. Objetivo: No presente estudo investigamos se a regressãoparcial observada em GBM recorrente de paciente tratado com administração intranasal de AP é mediadapor apoptose. Resultado: Ensaios com TUNEL (deoxynucleotidyl-mediated deoxyuridine triphosphate) ecaspase-3 ativada evidenciaram presença de células apoptóticas nas lâminas de GBM tratado. Conclusão:Esses achados sugerem que estratégias adjuvantes visando à inativação das vias de sinalização do EGFRe Ras podem melhorar tanto a eficácia de terapia isolada como de terapia multimodal em gliomas.

Background: In vitro studies demonstrated that both radiation and chemotherapy can activate EGFRand Ras signaling pathways, leading to increased cross-resistance to treatment of GBM cell. Inhibition of either EGFR or Ras activity with tytosine kinase inhibitor appears to abrogate the observed antagonism between sequentially administration of these therapeutic modalities inducing apoptosis in these cells. In a previous study, we demonstrated that in vitro treatment with perillyl alcohol (POH), an inhibitor of Ras farnezilation, induced apoptosis in human GBM cell lines and explants. Objective: In the presentstudy, we investigated if the partial regression observed in a patient with a recurrent GBM after treatmentby intranasal delivery of POH, is mediated by apoptosis. Result: Data from classical histology, terminaldeoxynucleotidyl-mediated deoxyuridine triphosphate nick-end labeling (TUNEL) assay, as well asactivation of caspase 3, showed increased apoptosis in the treated tumor. Conclusion: These findings suggest that strategies to inactivate EGFR and RAS signaling may be critical to improving not only theefficacy of single-agent therapy but also of multimodal therapy in gliomas.