RESUMEN
The standard treatment for colorectal cancer has always been surgery and chemotherapy, which may be used in combination to treat patients. Immune checkpoint inhibitors have been a significant advancement in the standard treatment of metastatic, unresectable colorectal cancer with deficient mismatch repair. However, little information is available about their use in neoadjuvant and conversion settings with only a few case reports and only one phase 2 trial. The present study reports the case of a large, locally advanced right-sided metastatic deficient mismatch repair/microsatellite instability-high colon cancer, which showed a pathological complete response after combination treatment with nivolumab and ipilimumab. To the best of our knowledge, resected metastatic colon cancer with a pathological complete response after treatment using dual immune checkpoint inhibitors has not been previously reported. Overall, this case report suggests the use of immune checkpoint inhibitors before colorectal surgery.
RESUMEN
When pancreatic head cancer invades the superior mesenteric artery (SMA), attempts at curative resection are aborted. Preoperative imaging diagnostics to determine the surgical curability have yet to surpass the intraoperative information acquired via inspection, palpation, and trial dissection. Pancreatoduodenectomy (PD) is a standard measure for treating periampullary cancers. In conventional PD, SMA invasion is usually identified by dissecting the retroportal lamina, which connects the uncinate process and SMA nerve plexus after dividing the neck of the pancreas. During PD for pancreatic head cancer, this retroperitoneal margin frequently vitiates surgical curability. SMA-first approaches during PD are methods where the SMA is dissected first by severing the posterior pancreatic capsule to assess the SMA involvement of pancreatic cancer early in the operation. The first report of such an approach prompted subsequent reports of various maneuvers that are now known collectively as "artery-first" approaches. We herein review those approaches by classifying them according to (1) the side of the mesocolon from where the SMA approach occurs (supracolic or infracolic) and (2) the direction of access (right or left and anterior or posterior). The steps of the reported PD procedures are numbered according to a timeline and summarized using anatomical division of the SMA.
Asunto(s)
Arteria Mesentérica Superior/anatomía & histología , Neoplasias Pancreáticas/patología , Neoplasias Pancreáticas/cirugía , Pancreaticoduodenectomía/métodos , Neoplasias Vasculares/irrigación sanguínea , Neoplasias Vasculares/patología , Humanos , Invasividad Neoplásica , Neoplasias Pancreáticas/irrigación sanguíneaRESUMEN
Long-chain acyl-CoA synthetase-1 (ACSL1), an enzyme that catalyzes the synthesis of long-chain acyl-CoA from the corresponding fatty acids, is believed to play essential roles in lipid metabolism. Structure activity relationship studies based on HTS hit compound 1 delivered the benzimidazole series as the first selective and highly potent ACSL1 inhibitors. Representative compound 13 exhibited not only remarkable inhibitory activity against ACSL1 (IC50 = 0.042 µM) but also excellent selectivity for the other ACSL isoforms. In addition, compound 13 demonstrated an in vivo suppression effect against the production of long-chain acyl-CoAs in mouse.
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Bencimidazoles/farmacología , Coenzima A Ligasas/antagonistas & inhibidores , Descubrimiento de Drogas , Inhibidores Enzimáticos/farmacología , Animales , Bencimidazoles/síntesis química , Bencimidazoles/química , Coenzima A Ligasas/metabolismo , Relación Dosis-Respuesta a Droga , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/química , Humanos , Ratones , Ratones Noqueados , Estructura Molecular , Relación Estructura-ActividadRESUMEN
BACKGROUND: Filiform polyposis is a rare form of inflammatory polyposis, which is occasionally formed in the colon of patients with history of inflammatory bowel disease (IBD). It is characterized by presence of several to hundreds of slender, worm-like polyps in the colon lined by histologically normal colonic mucosa and often coalesce, resulting in a tumor-like mass. Filiform polyposis is most frequently associated with a post-inflammatory reparative process in patients with IBD history, and only cases of filiform polyposis occurring in patients without IBD history have been reported. Filiform polyposis has been considered as a benign inflammatory polyposis without any risk of dysplasia, while the possibility of carcinogenesis of inflammatory polyps is not fully excluded. To date, only three cases of filiform polyposis coexisting with dysplasia have been reported. CASE PRESENTATION: A 59-year-old male patient with no past medical history of IBD underwent laparoscopic sigmoidectomy for obstructive filiform polyposis, which was associated with sigmoid colon adenocarcinoma. Based on the histological findings of the resected specimen, invasive sigmoid colon adenocarcinoma was surrounded by filiform polyposis, and adenocarcinoma also scattered uniformly on the surface of filiform polyposis. In immunohistochemistry, abnormal p53 expression was observed in adenocarcinoma, while it was not shown in mucosa on filiform polyposis. CONCLUSIONS: This is the fourth case of filiform polyposis that is closely associated with colon dysplasia or adenocarcinoma based on histological findings. However, immunohistochemical findings did not support the theory that inflammation initiates adenocarcinoma in filiform polyposis like IBD. Hence, further immunohistochemical and genetic analyses are needed to clarify the association between filiform polyposis and carcinogenesis.
RESUMEN
BACKGROUND: Retinoic acid receptor-related orphan receptor gamma t (RORγt) has critical roles in the development, maintenance and function of interleukin (IL)-17-producing cells and is a highly attractive target for the treatment of IL-17-mediated autoimmune disease, particularly psoriasis. On the other hand, RORγt is also critical for controlling apoptosis during thymopoiesis, and genetic RORγt ablation or systematic RORγt inhibition cause progressive thymic aberrations leading to T cell lymphomas. OBJECTIVE: We investigated whether topical administration of our novel RORγt inhibitor, S18-000003 has therapeutic potential for psoriasis with low risk of thymic aberrations. METHODS: We evaluated the effect of topical S18-000003 on psoriasis-like skin inflammation and influence on the thymus in a 12-O-tetradecanoylphorbol-13-acetate-induced K14.Stat3C mouse psoriasis model. RESULTS: S18-000003 markedly inhibited the development of psoriatic skin inflammation via suppression of the IL-17 pathway. In the skin, S18-000003 suppressed all subsets of IL-17-producing cells that we previously identified in this psoriasis model: Th17 cells, Tc17 cells, dermal γδ T cells, TCR- cells that probably included innate lymphoid cells, and CD4-CD8- double-negative αß T cells. Notably, neither reduction of CD4+CD8+ double-positive thymocytes nor dysregulation of cell cycling was observed in S18-000003-treated mice, even at a high dose. CONCLUSION: Our topically administered RORγt inhibitor is a potential therapeutic agent for psoriasis with low risk of thymic lymphoma.
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Fármacos Dermatológicos/farmacología , Miembro 3 del Grupo F de la Subfamilia 1 de Receptores Nucleares/antagonistas & inhibidores , Psoriasis/tratamiento farmacológico , Sulfonas/farmacología , Administración Cutánea , Animales , Células Cultivadas , Fármacos Dermatológicos/uso terapéutico , Modelos Animales de Enfermedad , Evaluación Preclínica de Medicamentos , Voluntarios Sanos , Humanos , Inmunidad Innata/efectos de los fármacos , Interleucina-17/inmunología , Interleucina-17/metabolismo , Leucocitos Mononucleares , Ratones , Ratones Endogámicos C57BL , Ratones Transgénicos , Miembro 3 del Grupo F de la Subfamilia 1 de Receptores Nucleares/inmunología , Cultivo Primario de Células , Psoriasis/diagnóstico , Psoriasis/etiología , Psoriasis/patología , Índice de Severidad de la Enfermedad , Piel/efectos de los fármacos , Piel/inmunología , Piel/patología , Sulfonas/uso terapéutico , Linfocitos T Colaboradores-Inductores/efectos de los fármacos , Linfocitos T Colaboradores-Inductores/inmunología , Acetato de Tetradecanoilforbol/toxicidad , Resultado del TratamientoRESUMEN
The retinoic acid receptor-related orphan receptor-gamma-t (RORγt) is the master transcription factor responsible for regulating the development and function of T-helper 17 (Th17) cells, which are related to the pathology of several autoimmune disorders. Therefore, RORγt is an attractive drug target for such Th17-mediated autoimmune diseases. A structure-activity relationship (SAR) study of lead compound 1 yielded a novel series of RORγt inhibitors, represented by compound 6. Detailed SAR optimization, informed by X-ray cocrystal structure analysis, led to the discovery of a potent orally bioavailable RORγt inhibitor 25, which inhibited IL-17 production in the skin of IL-23-treated mice by oral administration.
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Amidas/química , Miembro 3 del Grupo F de la Subfamilia 1 de Receptores Nucleares/antagonistas & inhibidores , Administración Oral , Amidas/farmacocinética , Amidas/uso terapéutico , Animales , Enfermedades Autoinmunes/tratamiento farmacológico , Sitios de Unión , Unión Competitiva , Cristalografía por Rayos X , Evaluación Preclínica de Medicamentos , Semivida , Humanos , Interleucina-17/metabolismo , Interleucina-23/farmacología , Ratones , Simulación de Dinámica Molecular , Miembro 3 del Grupo F de la Subfamilia 1 de Receptores Nucleares/metabolismo , Unión Proteica , Ratas , Piel/efectos de los fármacos , Piel/metabolismo , Relación Estructura-Actividad , Células Th17/citología , Células Th17/efectos de los fármacos , Células Th17/metabolismoRESUMEN
Novel acetyl-CoA carboxylase 2 (ACC2) selective inhibitors were identified by the conversion of the alkyne unit of A-908292 to the olefin linker. Modification of the center and left part of the lead compound 1b improved the ACC2 inhibitory activity and CYP450 inhibition profile, and afforded a highly selective ACC2 inhibitor 2e which showed in vivo efficacy in C57BL/6 mice.
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Acetil-CoA Carboxilasa/antagonistas & inhibidores , Alquenos/farmacología , Descubrimiento de Drogas , Inhibidores Enzimáticos/farmacología , Acetil-CoA Carboxilasa/metabolismo , Alquenos/síntesis química , Alquenos/química , Animales , Relación Dosis-Respuesta a Droga , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/química , Humanos , Ratones , Ratones Endogámicos C57BL , Estructura Molecular , Relación Estructura-ActividadRESUMEN
BACKGROUND/AIM: Hypoxia offers resistance to therapy in human solid tumors. The aim of the study was to investigate whether SN-38, the active metabolite of irinotecan, acts as a radiosensitizer through inhibition of hypoxia-inducible factor (HIF)-1α in the human colorectal cancer (CRC) cells. MATERIALS AND METHODS: HT29 and SW480 cells were cultured with SN-38 (0-4 µM) immediately after irradiation (0-8 Gy). HIF-1α expression was assessed using flow-cytometry and western blot analysis. Cell proliferation was evaluated by the calcein assay. Apoptosis and cell cycle were determined by flow-cytometry. RESULTS: Radiation up-regulated HIF-1α, and SN-38 inhibited the radiation-induced HIF-1α. The combination of radiation and SN-38 inhibited cell proliferation more than radiation alone; treatment with SN-38 after radiation exposure did not increase the number of apoptotic cells, whereas, it enhanced the S and G2/M cell-cycle arrest and decreased the population of cells in G1 Conclusion: SN-38 inhibits the radiation-induced up-regulation of HIF-1α and acts as a radiosensitizer by inducing cell-cycle arrest in CRC cells.
Asunto(s)
Camptotecina/análogos & derivados , Subunidad alfa del Factor 1 Inducible por Hipoxia/metabolismo , Fármacos Sensibilizantes a Radiaciones/farmacología , Regulación hacia Arriba/efectos de los fármacos , Apoptosis/efectos de los fármacos , Apoptosis/efectos de la radiación , Camptotecina/farmacología , Línea Celular Tumoral , Proliferación Celular/efectos de los fármacos , Proliferación Celular/efectos de la radiación , Neoplasias Colorrectales/metabolismo , Neoplasias Colorrectales/patología , Puntos de Control de la Fase G2 del Ciclo Celular/efectos de los fármacos , Puntos de Control de la Fase G2 del Ciclo Celular/efectos de la radiación , Células HT29 , Humanos , Irinotecán , Fase S/efectos de los fármacos , Fase S/efectos de la radiación , Regulación hacia Arriba/efectos de la radiaciónRESUMEN
Neuropeptide Y (NPY) Y5 receptor plays a key role in the effects of NPY, an important neurotransmitter in the control of energy homeostasis including stimulation of food intake and inhibition of energy expenditure. The NPY-Y5 receptor system has been an attractive drug target for potential use in treating obesity. Here we report the discovery and characterization of two novel Y5 receptor antagonists, S-2367 and S-234462. Both compounds displayed high affinity for the Y5 receptor in the radio-ligand binding assay, while in the cell-based functional assay, S-2367 and S-234462 showed, respectively, surmountable and insurmountable antagonism. In cell-based washout experiments, S-234462 dissociated from the Y5 receptor more slowly than S-2367. In vivo study showed that S-234462 effectively suppressed food intake induced by acute central injection of a selective Y5 receptor agonist. Furthermore, high-fat diet-induced obese (DIO) mice treated with S-234462 for 5â¯weeks showed a significant decrease in body weight gain and food intake compared to those treated with S-2367. In conclusion, S-234462 exhibits insurmountable antagonism of NPY Y5 receptor in vitro and superior anti-obesity effects to the surmountable NPY Y5 antagonist S-2367 in DIO mice.
Asunto(s)
Dieta Alta en Grasa/efectos adversos , Ingestión de Alimentos/efectos de los fármacos , Obesidad/tratamiento farmacológico , Receptores de Neuropéptido Y/antagonistas & inhibidores , Receptores de Neuropéptido Y/metabolismo , Animales , Modelos Animales de Enfermedad , Metabolismo Energético/efectos de los fármacos , Inyecciones Intraventriculares/métodos , Masculino , Ratones Endogámicos C57BL , Ratones Obesos/metabolismo , Neuropéptido Y/metabolismo , Obesidad/metabolismoRESUMEN
BACKGROUND: Neoadjuvant chemoradiotherapy followed by an optimal surgery is the standard treatment for patients with locally advanced rectal cancer. FDG-PET/CT is commonly used as the modality for assessing the effect of chemoradiotherapy. OBJECTIVE: The purpose of this study was to investigate whether PET/CT-based volumetry could contribute to the prediction of pathological complete response or prognosis after neoadjuvant chemoradiotherapy. DESIGN: This was a retrospective cohort study. SETTINGS: This study was conducted at a single research center. PATIENTS: Ninety-one consecutive patients with locally advanced rectal cancer were enrolled between January 2005 and December 2015. INTERVENTION: Patients underwent PET/CT before and after neoadjuvant chemoradiotherapy. MAIN OUTCOME MEASURES: Maximum standardized uptake value and total lesion glycolysis on PET/CT before and after neoadjuvant chemoradiotherapy were calculated using isocontour methods. Correlations between these variables and clinicopathological factors and prognosis were assessed. RESULTS: PET/CT-associated variables before chemoradiotherapy were not correlated with either clinicopathological factors or prognosis. Maximum standardized uptake value was associated with pathological complete response, but total lesion glycolysis was not. Maximum standardized uptake value correlated with ypT, whereas total lesion glycolysis correlated with both ypT and ypN. High total lesion glycolysis was associated with a considerably poorer prognosis; the 5-year recurrence rate was 65% and the 5-year mortality rate 42%, whereas in lesions with low total lesion glycolysis, these were 6% and 2%. On multivariate analysis, high total lesion glycolysis was an independent risk factor for recurrence (HR = 4.718; p = 0.04). LIMITATIONS: The gain in fluoro-2-deoxy-D-glucose uptake may differ between scanners, thus the general applicability of this threshold should be validated. CONCLUSIONS: In patients with locally advanced rectal cancer, high total lesion glycolysis after neoadjuvant chemoradiotherapy is strongly associated with a worse prognosis. Total lesion glycolysis after chemoradiotherapy may be a promising preoperative predictor of recurrence and death. See Video Abstract at http://links.lww.com/DCR/A464.
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Quimioradioterapia/métodos , Tomografía Computarizada de Haz Cónico/métodos , Terapia Neoadyuvante/métodos , Tomografía Computarizada por Tomografía de Emisión de Positrones/métodos , Neoplasias del Recto/diagnóstico por imagen , Adulto , Anciano , Anciano de 80 o más Años , Estudios de Cohortes , Femenino , Fluorodesoxiglucosa F18/administración & dosificación , Humanos , Masculino , Persona de Mediana Edad , Recurrencia Local de Neoplasia , Neoplasias del Recto/metabolismo , Neoplasias del Recto/mortalidad , Estudios Retrospectivos , Tasa de Supervivencia , Resultado del TratamientoRESUMEN
BACKGROUND: Clinical studies of intraperitoneal chemotherapy with paclitaxel in patients of gastric cancer with peritoneal carcinomatosis is well tolerated and effective, and rare cases of metastasis and recurrence have experienced during the treatment. Disseminated carcinomatosis of the bone marrow is highly rare in gastric cancer and associated with a poor prognosis. CASE PRESENTATION: A 59-year-old woman of gastric cancer with peritoneal carcinomatosis received five courses of chemotherapy with intraperitoneal administration of paclitaxel, and laparoscopy showed disappearance of the peritoneal carcinomatosis. She subsequently underwent total gastrectomy, and the histopathological findings showed a complete response to the chemotherapy. Postoperatively, chemotherapy with intraperitoneal administration of paclitaxel was continued for 30 months, without apparent recurrence. However, the gastric cancer recurred as disseminated carcinomatosis of the bone marrow with disseminated intravascular coagulation, and we hence changed the chemotherapy regimen to weekly irinotecan. Remission was achieved, and she did not experience any major symptoms; however, she died 6 months after the diagnosis of disseminated carcinomatosis of the bone marrow. CONCLUSIONS: Since intraperitoneal paclitaxel administration can strongly suppress peritoneal carcinomatosis of gastric cancer, careful attention should be paid not only to peritoneal recurrence but also for rare site metastases, such as bone marrow metastases.
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Protocolos de Quimioterapia Combinada Antineoplásica/efectos adversos , Neoplasias de la Médula Ósea/etiología , Gastrectomía/efectos adversos , Recurrencia Local de Neoplasia/terapia , Neoplasias Peritoneales/etiología , Neoplasias Gástricas/terapia , Neoplasias de la Médula Ósea/patología , Terapia Combinada , Coagulación Intravascular Diseminada , Femenino , Humanos , Inyecciones Intraperitoneales , Persona de Mediana Edad , Recurrencia Local de Neoplasia/patología , Neoplasias Peritoneales/patología , Pronóstico , Neoplasias Gástricas/patología , Factores de TiempoRESUMEN
Optimization of HTS hit 1 for NPY Y5 receptor binding affinity, CYP450 inhibition, solubility and metabolic stability led to the identification of some orally available oxygen-linker derivatives for in vivo study. Among them, derivative 4i inhibited food intake induced by the NPY Y5 selective agonist, and chronic oral administration of 4i in DIO mice caused a dose-dependent reduction of body weight gain.
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Fármacos Antiobesidad/química , Bencimidazoles/química , Receptores de Neuropéptido Y/agonistas , Sulfonas/química , Administración Oral , Animales , Fármacos Antiobesidad/farmacocinética , Fármacos Antiobesidad/uso terapéutico , Bencimidazoles/farmacocinética , Bencimidazoles/farmacología , Bencimidazoles/uso terapéutico , Inhibidores Enzimáticos del Citocromo P-450 , Sistema Enzimático del Citocromo P-450/metabolismo , Semivida , Ratones , Obesidad/tratamiento farmacológico , Ratas , Receptores de Neuropéptido Y/metabolismo , Relación Estructura-Actividad , Sulfonas/farmacología , Sulfonas/uso terapéutico , Aumento de Peso/efectos de los fármacosRESUMEN
Optimization of lead compound 2 is described, mainly focusing on modification at the C-2 position of the benzimidazole core. Replacement of the phenyl linker of 2 with saturated rings resulted in identification of compound 8b which combines high Y5 receptor binding affinity with a good ADME profile leading to in vivo efficacy.
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Bencimidazoles/química , Bencimidazoles/farmacología , Receptores de Neuropéptido Y/antagonistas & inhibidores , Administración Oral , Animales , Diseño de Fármacos , Estabilidad de Medicamentos , Humanos , Concentración 50 Inhibidora , Ratones , Ratones Obesos , Unión Proteica/efectos de los fármacos , Solubilidad , Relación Estructura-ActividadRESUMEN
Optimization of our HTS hit 1, mainly focused on modification at the C-2 position of the benzimidazole core, is described. Elimination of the flexible and metabolically labile -S-CH(2)- part and utilization of less lipophilic pyridone substructure led to identification of novel NPY Y5 receptor antagonists 6, which have low to sub-nanomolar Y5 receptor binding affinity with improved CYP450 inhibition profiles, good solubilities and high metabolic stabilities.
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Bencimidazoles/química , Bencimidazoles/farmacología , Piridonas/química , Piridonas/farmacología , Receptores de Neuropéptido Y/antagonistas & inhibidores , Animales , Bencimidazoles/síntesis química , Bencimidazoles/metabolismo , Inhibidores Enzimáticos del Citocromo P-450 , Sistema Enzimático del Citocromo P-450/metabolismo , Diseño de Fármacos , Humanos , Ratones , Microsomas Hepáticos/metabolismo , Obesidad/tratamiento farmacológico , Piridonas/síntesis química , Piridonas/metabolismo , Ratas , Receptores de Neuropéptido Y/metabolismoRESUMEN
We report a hit to lead study on a novel benzoxazole NPY Y5 antagonist. Starting from HTS hit 1, structure-activity relationships were developed. Compound 12 showed reduction of food intake and a tendency to suppress body weight gain over the 21-day experimental period.
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Fármacos Antiobesidad/química , Fármacos Antiobesidad/uso terapéutico , Benzoxazoles/química , Benzoxazoles/uso terapéutico , Obesidad/tratamiento farmacológico , Receptores de Neuropéptido Y/antagonistas & inhibidores , Animales , Fármacos Antiobesidad/farmacocinética , Fármacos Antiobesidad/farmacología , Benzoxazoles/farmacocinética , Benzoxazoles/farmacología , Peso Corporal/efectos de los fármacos , Ingestión de Alimentos/efectos de los fármacos , Humanos , Ratones , Obesidad/metabolismo , Ratas , Receptores de Neuropéptido Y/metabolismo , Relación Estructura-ActividadRESUMEN
Cytosolic phospholipase A(2)alpha (cPLA(2)alpha), one of the three subtypes of cPLA(2) (alpha, beta and gamma), is thought to be a rate-limiting enzyme in eicosanoid biosynthesis. We developed a novel and potent cPLA(2)alpha inhibitor with an optically active pyrrolidine, termed pyrrophenone, and characterized this compound in detail using enzyme and cellular assay systems. Pyrrophenone, which shows strong inhibition of cPLA(2)alpha activity, is one of the most potent cPLA(2)alpha inhibitors reported to date. Similar inhibitory potencies for cPLA(2)alpha were obtained from three different assays. The inhibitory activity of pyrrophenone is two or three orders of magnitude more potent than arachidonyl trifluoromethyl ketone (AACOCF(3)) under the same assay conditions. Pyrrophenone shows reversible inhibition of cPLA(2)alpha and displays no characteristics of the slow-binding inhibition observed for AACOCF(3). Pyrrophenone also inhibited the esterase and lysophospholipase activities of cPLA(2)alpha. However, the inhibition by pyrrophenone of 14 kDa secretory PLA(2)s, types IB and IIA, was over two orders of magnitude less potent than that for cPLA(2)alpha. Pyrrophenone strongly inhibited arachidonic acid release in calcium ionophore (A23187)-stimulated human monocytic cells (THP-1 cells) in a dose-dependent manner with an IC(50) value of 0.024 microM, followed by suppression of eicosanoid synthesis, and also showed dose-dependent inhibition for interleukin-1-induced prostaglandin E(2) synthesis in human renal mesangial cells with an IC(50) value of 0.0081 microM. The mechanism of inhibition of eicosanoid synthesis in these cell-based assays was due to inhibition of only one step of arachidonic acid release without any effect on cyclo-oxygenase or lipoxygenase pathways. These results suggest that pyrrophenone could be a potential therapeutic agent for inflammatory diseases.