| 21. |
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| 22. |
- Zhukova, Nataliya, et al.
(författare)
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WNT activation by lithium abrogates TP53 mutation associated radiation resistance in medulloblastoma
- 2014
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Ingår i: Acta neuropathologica communications. - : Springer Science and Business Media LLC. - 2051-5960. ; 2
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Tidskriftsartikel (refereegranskat)abstract
- TP53 mutations confer subgroup specific poor survival for children with medulloblastoma. We hypothesized that WNT activation which is associated with improved survival for such children abrogates TP53 related radioresistance and can be used to sensitize TP53 mutant tumors for radiation. We examined the subgroup-specific role of TP53 mutations in a cohort of 314 patients treated with radiation. TP53 wild-type or mutant human medulloblastoma cell-lines and normal neural stem cells were used to test radioresistance of TP53 mutations and the radiosensitizing effect of WNT activation on tumors and the developing brain. Children with WNT/TP53 mutant medulloblastoma had higher 5-year survival than those with SHH/TP53 mutant tumours (100% and 36.6%±8.7%, respectively (p<0.001)). Introduction of TP53 mutation into medulloblastoma cells induced radioresistance (survival fractions at 2Gy (SF2) of 89%±2% vs. 57.4%±1.8% (p<0.01)). In contrast, beta-catenin mutation sensitized TP53 mutant cells to radiation (p<0.05). Lithium, an activator of the WNT pathway, sensitized TP53 mutant medulloblastoma to radiation (SF2 of 43.5%±1.5% in lithium treated cells vs. 56.6±3% (p<0.01)) accompanied by increased number of gammaH2AX foci. Normal neural stem cells were protected from lithium induced radiation damage (SF2 of 33%±8% for lithium treated cells vs. 27%±3% for untreated controls (p=0.05). Poor survival of patients with TP53 mutant medulloblastoma may be related to radiation resistance. Since constitutive activation of the WNT pathway by lithium sensitizes TP53 mutant medulloblastoma cells and protect normal neural stem cells from radiation, this oral drug may represent an attractive novel therapy for high-risk medulloblastomas.
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| 27. |
- La Manno, G, et al.
(författare)
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RNA velocity of single cells
- 2018
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 1476-4687 .- 0028-0836. ; 560:7719, s. 494-
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Tidskriftsartikel (refereegranskat)
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| 28. |
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| 29. |
- Montgomery, Scott, 1961-, et al.
(författare)
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Infections in patients with multiple sclerosis : a nationwide cohort study in Sweden
- 2019
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Ingår i: Multiple Sclerosis Journal. - : Sage Publications. - 1352-4585 .- 1477-0970. ; 25:Suppl. 2, s. 388-388
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Introduction: Previous studies suggest that susceptibility to infections is not raised among multiple sclerosis (MS) patients in general, but certain specific infections, such as those of the urinary or respiratory tract, are more common in patients with higher disability. However, contemporary MS cohorts to a higher degree are treated with newer disease-modifying treatments (DMTs) that exert stronger effects on the immune defence. Here we investigated the rate of infections in patients before and after MS diagnosis as compared with a matched MS-free population.Methods: Incident MS patients diagnosed in 2008-2016 were identified in the Swedish National Patient Register. MS patients were matched to 10 MS-free individuals by age, sex, and region of residence. Incidence rates per 10,000 person-years and incidence rate ratios (IRRs) of first infection by site and type were calculated after the MS diagnosis date.Results: In total, 6,602 MS patients were identified and compared with 61,828 without MS (female, 69%; median age, 40 years). During the year before MS diagnosis, MS patients showed higher proportions of urinary and kidney infections, meningitis and encephalitis, and bacterial infections compared with the MS-free cohort.After MS diagnosis, an increased risk of non-serious (IRR 1.65; 95% CI 1.56-1.75) and serious (admitted to hospital) infections (IRR 2.59; 95% CI 2.33-2.89) was detected among MS patients relative to the MS-free cohort. The risk of some bacterial (IRR 2.23; 95% CI 1.98-2.52) and some viral infections (IRR 1.70; 95% CI 1.48-1.96) was higher in MS patients of both sexes while only males showed an increased risk of fungal infections (IRR 1.91; 95% CI 1.26-2.89). Relative to the MS-free cohort, MS patients had an increased risk of all infection types, such as meningitis and encephalitis (IRR 6.16; 95% CI 4.47-8.48), other opportunistic infections (IRR 2.72; 95% CI 2.08-3.55), urinary and kidney infections (IRR 2.44; 95% CI 2.24-2.66), herpes virus (IRR 2.32; 95% CI 1.77-3.05), pneumonia and influenza (IRR 1.92; 95% CI 1.66-2.23), and skin infections (IRR 1.89; 95% CI 1.65-2.16).Conclusions: After MS diagnosis, patients had higher incidences of non-serious and serious infections compared with a cohort without MS. MS patients had an increased risk of being diagnosed during follow-up with most infection types compared with controls. This risk was particularly high for meningitis and encephalitis.
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| 30. |
- Montgomery, Scott, 1961-, et al.
(författare)
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Risk of osteoporosis and fractures in patients with multiple sclerosis : a nationwide cohort study in Sweden
- 2019
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Ingår i: Multiple Sclerosis Journal. - : Sage Publications. - 1352-4585 .- 1477-0970. ; 25:Suppl. 2, s. 387-388
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Introduction: While multiple sclerosis (MS) is usually diagnosed in young adults, many individuals living with the diagnosis are above age 40 years. Osteoporosis and fractures, which are morbidities generally associated with ageing but also physical inactivity, were determined in patients before and after MS diagnosis and compared with a matched MS-free population.Methods: Incident MS patients diagnosed in 2008-2016 were identified in the Swedish National Patient Register and matched with 10 MS-free individuals by age, sex, and region of residence. Incidence rates (IR) per 10,000 person-years and incidence rate ratios (IRRs; vs the MS-free cohort) of osteoporosis and fractures by sex and age at event were calculated after MS diagnosis based on ICD-10 codes from inpatient and outpatient specialist care.Results: In total, 6,602 MS patients were identified and compared with 61,828 without MS (female, 69%; median age, 40 years). Before MS diagnosis, MS patients showed significantly increased proportions of osteoporosis (0.5% vs 0.3%) and fractures (12.6% vs 11.4%) compared with the MS-free cohort.After diagnosis, MS patients had an increased risk of osteoporosis (IRR 1.69; 95% confidence interval [CI] 1.22-2.35). The increased risk of osteoporosis among MS patients was observed for both sexes (females, IRR 1.60; 95% CI 1.13-2.28 and males, IRR 2.56; 95% CI 1.04-6.31), as well as in the older age strata 40-59 years (IRR 2.39; 95% CI 1.47-3.89) and ⩾60 years (IRR 1.69; 95% CI 1.06-2.70), but not among those aged < 40 years. Similarly, an increased risk of fractures among MS patients (IRR 1.37; 95% CI 1.24-1.51) was shown for both females (IRR 1.40; 95% CI 1.25-1.58) and males (IRR 1.29; 95% CI 1.07-1.55), as well as the age strata 40-59 years (IRR 1.52; 95% CI 1.31-1.76) and ⩾60 years (IRR 1.92; 95% CI 1.58-2.33), but not those aged < 40 years.Conclusions: The risk of osteoporosis and fractures was moderately increased in MS patients of both sexes and in the older age groups, which may relate to physical inactivity and an increased risk of falls.
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