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  1. Abstrakt Jämlikhet, mångfald och inkludering (EDI efter engelska Equity, diversity and inclusivity) är värden som alla forskargrupper och organisationer ska sträva efter. Dessa värden säkrar arbetsvillkor, policies och praktik som inte bara främjar forskningsresultat av hög kvalité men även det vulkanologiska samhällets välbefinnande. I denna artikel reflekterar vi över EDI framsteg inom vulkanologin genom att utvärdera internationella organisationers medlemsdata, sammansättningen av nämnder, fördelning av priser och förstaförfattarskap av artiklar i vulkanologiska tidskrifter. På grund av den otillräckliga tillgången på data fokuserar vi vår analys utifrån diskriminering som kan kopplas till könsidentitet, men visar även att diskriminering på grund av etnicitet, sexuell läggning, religion, fysisk förmåga och socioekonomisk bakgrund förekommer och att om flera av dessa faktorer korsas leder det till ännu värre marginalisering inom det vulkanologiska samhället. Vi delar förslag och råd från andra discipliner om hur individer, forskargrupper och organisationer kan främja, utveckla och implementera nya initiativ som identifierar och tar itu med diskriminering och förbättrar EDI inom vulkanologin. Det finns mycket förbättringspotential om vi alla ser vår roll i att skapa ett jämlikare, och inkluderande vulkanologiskt samhälle med mer mångfald. Att uppnå detta kräver: 1) Medvetenhet: erkännandet av problemet, 2) Engagemang: genom att anta EDI i värdegrunden och utveckla handlingsplaner, uppförandekoder och riktlinjer, 3) Handling med målet att uppnå alla gruppers representation och 4) Reflektion: utveckling genom kritisk självreflektion och viljan att ta itu med brister. 
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  2. Abstract Background

    In vitro studies using nucleus pulposus (NP) cells are commonly used to investigate disc cell biology and pathogenesis, or to aid in the development of new therapies. However, lab‐to‐lab variability jeopardizes the much‐needed progress in the field. Here, an international group of spine scientists collaborated to standardize extraction and expansion techniques for NP cells to reduce variability, improve comparability between labs and improve utilization of funding and resources.

    Methods

    The most commonly applied methods for NP cell extraction, expansion, and re‐differentiation were identified using a questionnaire to research groups worldwide. NP cell extraction methods from rat, rabbit, pig, dog, cow, and human NP tissue were experimentally assessed. Expansion and re‐differentiation media and techniques were also investigated.

    Results

    Recommended protocols are provided for extraction, expansion, and re‐differentiation of NP cells from common species utilized for NP cell culture.

    Conclusions

    This international, multilab and multispecies study identified cell extraction methods for greater cell yield and fewer gene expression changes by applying species‐specific pronase usage, 60–100 U/ml collagenase for shorter durations. Recommendations for NP cell expansion, passage number, and many factors driving successful cell culture in different species are also addressed to support harmonization, rigor, and cross‐lab comparisons on NP cells worldwide.

     
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  3. Abstract

    Obesity increases the risk and worsens the prognosis for breast cancer due, in part, to altered adipose stromal cell (ASC) behavior. Whether ASCs from obese individuals increase migration of breast cancer cells relative to their lean counterparts, however, remains unclear. To test this connection, multicellular spheroids composed of MCF10A‐derived tumor cell lines of varying malignant potential and lean or obese ASCs are embedded into collagen scaffolds mimicking the elastic moduli of interstitial breast adipose tissue. Confocal image analysis suggests that tumor cells alone migrate insignificantly under these conditions. However, direct cell‐cell contact with either lean or obese ASCs enables them to migrate collectively, whereby obese ASCs activate tumor cell migration more effectively than their lean counterparts. Time‐resolved optical coherence tomography imaging suggests that obese ASCs facilitate tumor cell migration by mediating contraction of local collagen fibers. Matrix metalloproteinase (MMP)‐dependent proteolytic activity significantly contributes to ASC‐mediated tumor cell invasion and collagen deformation. However, ASC contractility is also important, as co‐inhibition of both MMPs and contractility is necessary to completely abrogate ASC‐mediated tumor cell migration. These findings imply that obesity‐mediated changes of ASC phenotype may impact tumor cell migration and invasion with potential implications for breast cancer malignancy in obese patients.

     
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