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peripheral mechanisms of chronic pain

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Medical Review 2022年第3期2卷 251-270页

作者： Qin Zheng Xintong Dong dustin p.green Xinzhong Dong Department of Anesthesiology and Critical Care Medicine School of MedicineJohns Hopkins UniversityRoom:Hunterian 814725 N.Wolfe St.BaltimoreMD 21205USA The Solomon H.Snyder Department of Neuroscience School of MedicineJohns Hopkins UniversityBaltimoreMDUSA Department of Neuroscience Cell Biologyand AnatomyUniversity of Texas Medical BranchGalvestonTXUSA The Solomon H.Snyder Department of Neuroscience School of MedicineJohns Hopkins UniversityRoom:Hunterian 817725 N.Wolfe St.BaltimoreMD 21205USA Howard Hughes Medical Institute School of MedicineJohns Hopkins UniversityBaltimoreMD 21209USA

Acutely,pain serves to protect us from potentially harmful stimuli,however damage to the somatosensory system can cause maladaptive changes in neurons leading to chronic *** acute pain is fairly well controlled,chronic pain remains difficult to *** pain is primarily a neuropathic condition,but studies examining the mechanisms underlying chronic pain are now looking beyond afferent nerve lesions and exploring new receptor targets,immune cells,and the role of the autonomic nervous system in contributing chronic pain *** studies outlined in this review reveal how chronic pain is not only confined to alterations in the nervous system and presents findings on new treatment targets and for this debilitating disease.

关键词： chronic pain DRG neurons glia immune cells peripheral mechanisms

Exploring the associations between skeletal muscle echogenicity and physical function in aging adults:A systematic review with meta-analyses

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Journal of Sport and Health Science 2024年第6期13卷 820-840页

作者： dustin J.Oranchuk Stephan G.Bodkin Katie L.Boncella Michael O.Harris-Love Muscle Morphology Mechanicsand Performance LaboratoryDepartment of Physical Medicine and RehabilitationUniversity of Colorado Anschutz Medical CampusAuroraCO 80045USA Department of physical Therapy

Background:Assessment and quantification of skeletal muscle within the aging population is vital for diagnosis,treatment,and injury/disease *** clinical availability of assessing muscle quality through diagnostic ultrasound presents an opportunity to be utilized as a screening tool for function-limiting ***,relationships between muscle echogenicity and clinical functional assessments require authoritative ***,we aimed to(a) synthesize the literature to assess the relationships between skeletal muscle echogenicity and physical function in older adults(≥60 years),(b) perform pooled analyses of relationships between skeletal muscle echogenicity and physical function,and(c) perform sub-analyses to determine between-muscle ***:CINAHL,Embase,MEDLINE,pubMed,and Web of Science databases were systematically searched to identify articles relating skeletal muscle echogenicity to physical function in older ***-of-bias assessments were conducted along with funnel plot ***-analyses with and without sub-analyses for individual muscles were performed utilizing Fisher's Z transformation for the most common measures of physical ***'s Z was back-transformed to pearson's r for ***:Fifty-one articles(n=5095,female=~2759,male=~2301,72.5± 5.8 years,mean±SD(1 study did not provide sex descriptors))were extracted for review,with previously unpublished data obtained from the authors of 13 *** rectus femoris(n=34) and isometric knee extension strength(n=22) were the most accessed muscle and physical qualities,*** relationship between quadriceps echogenicity and knee extensor strength was moderate(n=2924,r=-0.36(95% confidence interval:-0.38 to-0.32),p p strength,walking speed,sit-to-stand,timed up-and-go) resulting in slightly weaker correlations(r:-0.34 to-0.23,all p predicti

关键词： Correlations Echo intensity Elderly Intramuscular fat Strength

physiological phenotypes differ among color morphs in introduced common wall lizards(podarcis muralis)

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Integrative Zoology 2024年第3期19卷 505-523页

作者： Ali AMER Sierra SpEARS princeton L.VAUGHN Cece COLWELL Ethan H.LIVINGSTON Wyatt MCQUEEN Anna SCHILL dustin G.REICHARD Eric J.GANGLOFF Kinsey M.BROCK Department of Biological Sciences Ohio Wesleyan UniversityDelawareOhioUSA Department of Ecology and Evolutionary Biology Princeton UniversityPrincetonNew JerseyUSA Department of Biology Idaho State UniversityPocatelloIdahoUSA Department of Environmental Science Policyand ManagementCollege of Natural ResourcesUniversity of CaliforniaBerkeleyUSA Museum of Vertebrate Zoology University of CaliforniaBerkeleyUSA

Many species exhibit color polymorphisms which have distinct physiological and behavioral ***,the consistency of morph trait covariation patterns across species,time,and ecological contexts remains *** trait covariation is especially relevant in the context of invasion biology and urban ***,physiological traits pertaining to energy maintenance are crucial to fitness,given their immediate ties to individual reproduction,growth,and population *** investigated the physiological traits of podarcis muralis,a versatile color polymorphic species that thrives in urban environments(including invasive populations in Ohio,USA).We measured five physiological traits(plasma corticosterone and triglycerides,hematocrit,body condition,and field body temperature),which compose an integrated multivariate *** then tested variation among co-occurring color morphs in the context of establishment in an urban *** found that the traits describing physiological status and strategy shifted across the active season in a morph-dependent manner—the white and yellow morphs exhibited clearly different multivariate physiological phenotypes,characterized primarily by differences in plasma *** suggests that morphs have different strategies in physiological regulation,the flexibility of which is crucial to urban *** white-yellow morph exhibited an intermediate phenotype,suggesting an intermediary energy maintenance *** morphs also exhibited distinct phenotypes,but the low prevalence of this morph in our study populations precludes clear *** work provides insight into how differences among stable polymorphisms exist across axes of the phenotype and how this variation may aid in establishment within novel environments.

关键词： color polymorphism physiological status seasonal variation thermoregulation urban habitat

Synthesis of 4-[F-18]Fluoro-4-Deoxy-N-Acetyl-1,3,6-Tri-O-Acetylglucosamine, a potential Brain Imaging pET Agent

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Natural Science 2024年第3期16卷 19-23页

作者： Murthy Akula Derek Cressy Lee Collier George Kabalka dustin Osborne Department of Radiology The University of Tennessee Medical Center Knoxville USA Advion Biosciences Ithaca USA

The synthesis of a promising brain imaging agent 4-[F-18]fluoro-4-deoxy-N-acetyl-1,3,6-tri-O-acetylglucosamine, 2, was successfully accomplished from commercially available N-acetyl glucosamine in 5 steps. The non-decay corrected radiochemical yield and purity were found to be 31% ± 4% (n = 3) and >98% respectively. The total reaction time for radio labelling step was 50 min.

关键词： N-Acetylglucosamine Amyloidogenesis Lipase-Candida rugosa

In situ measurement of ECM rheology and microheterogeneity in embedded and overlaid 3D pancreatic tumor stroma co-cultures via passive particle tracking

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Journal of Innovative Optical Health Sciences 2017年第6期10卷 26-34页

作者： dustin p.Jones William Hanna Gwendolyn M.Cramer Jonathan p.Celli Department of physics University of Massachusetts Boston Boston MA 02215USA

Tumor growth is regulated by a diverse set of extraellular infuences,including paracrine crosstalk with stromal partners,and biophysical interactions with surrounding cells and *** elucidating the role of physical force and the mechanical properties of the extracellular matrix(ECM)itself as regulators of tumor growth and invasion have been greatly catalyzed by the use of in ritro three-dimensional(3D)tumor *** systems provide the ability to systematically isolate,manipulate,and evaluate impact of stromal components and extracellular mechanics in a platform that is both conducive to imaging and biologically ***,recognizing that mechanoregulatory crosstalk is bi-directional and fully utilizing these models requires complementary methods for in situ measurements of the local mechanical ***,in 3D tumor/fbroblast co-culture models of pancreatic canocer,a discase characterized by its prominent stromal involvement,we evaluate the use of particle-tracking microrhoology to probe dynamic mechanical *** videos of fuorescently labeled polystyrene micro-spheres embedded in ollagen I ECM,we measure spatiotemporal changes in the Brownian motion of probes to report local ECM shear modulus and *** approach reveals st ffening of collagen in fibroblast co-cultures relative to cultures with cancer cells only,which exhibit degraded ECM with heterogeneous *** further show that these effects are dependent on culture geometry with contrast ing behavior for embedded and overlay *** addition to potential application to screening stroma targeted therapeutics,this work also provides insight into how the compoition and plating geometry impact the mechanical propertios of 3D cell cultures that are increasingly widey used in cancer biology.

关键词： Microrheology 3D tumor models matrix remodeling mechanobiology stromal depletion

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肥大细胞特异性受体介导神经源性炎症和疼痛

中国疼痛医学杂志 2020年第7期26卷 481-483页

作者： green dustin p 刘彤彤(译) 唐宗湘(校) 不详南京中医药大学

肥大细胞被激活时可释放炎性细胞因子和趋化因子参与天然免疫细胞募集,作为神经系统和免疫系统联系的桥梁,肥大细胞的空间优势使其能够靠近外周神经末梢附近,在感觉神经纤维激活后率先做出反应。该研究发现肥大细胞特异性受体Mrgprb2通... 详细信息

肥大细胞被激活时可释放炎性细胞因子和趋化因子参与天然免疫细胞募集,作为神经系统和免疫系统联系的桥梁,肥大细胞的空间优势使其能够靠近外周神经末梢附近,在感觉神经纤维激活后率先做出反应。该研究发现肥大细胞特异性受体Mrgprb2通过在损伤部位招募天然免疫细胞,参与了炎症性机械痛和热痛觉过敏;肥大细胞可通过神经肽p物质激活Mrgprb2从而释放趋化因子,促使免疫细胞迁移;p物质激活人类肥大细胞上的MRGpRX2(Mrgprb2的同源基因)后也能释放多种促炎细胞因子和趋化因子;p物质介导的炎症反应独立于神经激肽-1受体(NK-1R)。结果表明Mrgprb2/X2参与了神经免疫调节,是治疗炎性痛的潜在靶点。

关键词：促炎细胞因子肥大细胞神经免疫调节趋化因子 p物质细胞迁移受体介导免疫系统

Flexible and stretchable electrodes for next generation polymer electronics: a review

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Science China Chemistry 2016年第6期59卷 659-662页

作者： dustin Chen Jiajie Liang Qibing pei Department of Materials Science and Engineering University of California Los Angeles School of Engineering and Applied Science and California Nanosystems Institute

Transparent conductive electrodes play a significant role in the fabrication and development of optoelectronic devices. As next generation optoelectronic devices tend towards mobile and wearable devices, the added attribute of flexibility or stretchability for these electrodes becomes increasingly important. However, mechanical requirements aside, transparent conductive electrodes must still retain high transparency and conductivity, with the metrics for these parameters being compared to the standard, indium tin oxide. In the search to replace indium tin oxide, two materials that have risen to the forefront are carbon nanotubes and silver nanowires due to their high transparency, conductivity, mechanical compliance, and ease of fabrication. This review highlights recent innovations made by our group in electrodes utilizing carbon nanotubes and silver nanowires, in addition to the use of these electrodes in discrete devices and integrated systems.

关键词： transparent conductive electrode carbon nanotube silver nanowire flexible stretchable OLED

Female mating status affects male mating tactic expression in the wolf spider Rabidosa punctulata

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Current Zoology 2022年第1期68卷 121-127页

作者： Sophie BUNCH dustin J.WILGERS Department of Natural Sciences McPherson College1600 E.EuclidMcPhersonKS 67460USA

Males and females have conflicting interests on the frequency and outcomes of mating *** maximize their fitness by mating with as many females as possible,whereas choosy females often reduce receptivity following *** male mating tactics can be adaptive in their expression to a variety of mating contexts,including interactions with a relatively unreceptive mated *** Rabidosa punctulata wolf spiders can adopt distinctive mating tactics when interacting with a female,a complex courtship display,and/or a more coercive direct mount tactic that often involves grappling with females for *** this study,we set up female mating treatments with initial trials and then paired mated and unmated females with males to observe both female remating frequencies and the male mating tactics used during the *** adopted different mating tactics depending on the mating status of the female they were paired *** were more likely to adopt a direct mount tactic with already-mated females and courtship with unmated ***-mated females were considerably less receptive to males during experimental trials,although they did remate 34%of the time,the majority of which were with males using a direct mount *** males adjusting to these contextual cues were able to gain more copulations,the observation of multiple mating in female *** introduces the potential for sperm *** discuss this sexual conflict in terms of the fitness consequences of these mating outcomes for both males and females.

关键词： alternative mating tactic female multiple mating Lycosidae sexual conflict

Anion structural effects on interaction of rare earth element ions with Dowex 50W X8 cation exchange resin

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Journal of Rare Earths 2018年第8期36卷 879-890页

作者： Duane D.Miller Ranjani Siriwardane dustin Mcintyre U.S. Department of Energy National Energy Technology Laboratory AECOM

The effect of the anion in the original rare earth element（REE） solution on the reversible ion exchange of Ce nitrate and Ce sulfate with the Dowex 50 W X8 was investigated using attenuated total reflection infrared（ATR-IR） spectroscopy, continuous flow reactor studies coupled with inductively coupled plasma mass spectroscopy（ICp-MS）, and density functional theory（DFT）. The simulated IR spectrum at the DFT B3 LYp/6-31 G（d） level was compared to the experimental results to characterize the IR spectrum, molecular interactions, and bonding of the ion exchanged species. The continuous liquid flow reactor studies show a capacity of 0.72 mmol/g sorbent for the Ce nitrateand 0.96 mmol/g sorbent for the Ce sulfate with the Dowex 50 W X8. The flow reactor studies reveal the type of solute anion（SO_4^（（2-）） or NO_3^（（-））） associated with the REE during cation exchange significantly affects the sorption capacity of the Dowex 50 W X8 ion exchange resin. The calculated REE binding energy（BE） and the DFT optimized structures suggest that the differences in sorption capacity is the result of the formation of different types of partially ionexchanged Ce_2^（（3＋））2 SO_4^（（2-）） and Ce^（（3＋）） 3 NO_3^（（-））. These results suggest that the solute anion affects the equilibrium constants of the Dowex resin by the formation of a charged layer capable of retaining the counterion. Modifying the sulfonic acid site（H＋） in the Dowex 50 W X8 with the NH_4~＋ counterion does not affect the sorption capacity and retention times of the Ce nitrate and Ce sulfate species. These results suggest that the counterions and co-ions having a finite size, may limit access to the Dowex sulfonate active site where the type of REE cation as a nitrate or sulfate in solution may significantly modify the sorption capacity of the ion exchange resin. Similar results are obtained during sorption with nitrates and sulfates of Sm and Yb.

关键词： Ion exchange Dowex Anion effects Rare earth metal sorption