1.
2.
Björkman, Kristoffer, et al.
(author)
Genotype-phenotype correlations in patients with complex I deficiency due to mutations in NDUFS1 and NDUFV1
2014
In: Euromit 2014, 15-19 juni, Tampere, Finland.
Conference paper (other academic/artistic) abstract
Objectives: To study genotype-phenotype correlations in genes encoding complex I electron input module subunits. Materials and methods: We studied five patients with isolated complex I deficiency, three with NDUFS1 mutations and two with NDUFV1 mutations. A literature review of all reported cases of mutations in the affected genes was performed. Results: The literature review revealed pathological mutations in NDUFS1 for 18 patients in 17 families and correspondingly in NDUFV1 for 26 patients in 19 families. Unpublished clinical data for our five patients were added. Our study showed quite variable clinical courses; death before two years of age was seen in 41% of patients while 18% were alive at seven years. There was a significant difference between the NDUFS1 and NDUFV1 groups for clinical onset and life-span. Mutations in NDUFS1 were linked to a worse clinical course with earlier onset and earlier death. Conclusions: Genotype-phenotype correlations in patients with mutations affecting the genes that encode the electron input module of complex I vary, but patients with NDUFS1 mutation tend to have a worse clinical course than patients with NDUFV1 mutation. Identifying the mutations is of importance for accurate prognostic information and genetic counseling.
3.
4.
Spetz, Johan, et al.
(author)
Effects of internal irradiation from 177Lu-octreotate on transcriptional expression in GOT1 midgut carcinoid in nude mice
2014
In: SweRays Workshop, Malmö, Sweden, Aug 20-22.
Conference paper (other academic/artistic) abstract
Introduction: Neuroendocrine (NE) tumors expressing somatostatin receptors (SSTR) are often treated with 177Lu-octreotate. The treatment is highly successful in animal models, but low cure rates in clinical studies suggests optimization of treatment protocol is needed. Little is known about which cellular responses play a crucial role in neuroendocrine tumors after irradiation. It is therefore important to identify the effects of 177Lu-octreotate on biological functions for future optimization of treatment parameters and the identification of biomarkers predicting treatment response. The aim of this study was to investigate the transcriptional response of GOT1 midgut carcinoid in nude mice following 177Lu-octreotate treatment. Methods: GOT1 bearing BALB/c nude mice were i.v. injected with 15 MBq 177Lu-octreotate and tumor size was measured twice a week using calipers. Animals were killed after 1, 3, 7 or 41 days and tumor samples excised and snap frozen in liquid nitrogen. Total RNA was extracted from tumor samples and subjected to Illumina microarray expression analysis. Differential transcriptional profiles were identified by comparing treated and untreated tumor samples using Nexus Expression 3.0 software. Associated biological functions and biological pathways (according to Gene Ontology terms) were compared using Nexus Expression 3.0 and Ingenuity IPA. Results: The mean tumor volume was clearly reduced after 177Lu-octreotate treatment. Microarray analysis showed clear difference in regulation pattern between the time points. The analysis of associated biological functions revealed clear effect on cell death and survival, and cell cycle after 1, 3, and 7 days, while cellular movement and cellular development were clearly influenced after 41 days. Cellular growth and proliferation was also affected after 1 day but not at the other time points studied. Conclusions: : Analysis of the transcriptional regulation in GOT1 tumors in nude mice following 177Lu-octreotate treatment revealed responses in different cellular functions that were distinct for each time point. These findings indicate potential venues for increasing clinical effectiveness of midgut carcinoid therapy with 177Lu-octreotate.
5.
6.
Calon, Tim, et al.
(author)
Multimodal analysis of the tissue response to a bone-anchored hearing implant. : 11. Calon TGA, Johansson ML, Omar O, Shah FA, Budding D, Trobos M, Thomsen P, Stokroos RJ, Palmquist
2019
In: 2nd Politzer Society Meeting/2nd World Congress of Otology, 28 May - 1 June, 2019, Warsaw, Poland..
Conference paper (other academic/artistic)
7.
Dalmo, Johanna, et al.
(author)
Potential renal toxicity biomarkers indicating radiation injury after 177Lu-octreotate treatment
2013
In: Annual congress of the European association of nuclear medicine, october 19-23, 2013, Lyon, France. Posterwalk.
Conference paper (other academic/artistic) abstract
The kidneys are one of the most exposed non-tumor tissues and regarded as one of the main dose-limiting organs in peptide receptor radionuclide therapy (PRRT). [177Lu-DOTA0, Tyr3]-octreotate (177Lu-octreotate) has shown promising results in the treatment of somatostatin receptor overexpressing neuroendocrine tumors, but optimization is still needed. The ability to give each patient as much 177Lu-octreotate as possible without inducing nephrotoxicity is necessary for an efficient treatment. However, due to large inter-individual differences in uptake and retention in the kidneys, there is a need for efficient Methods that early can indicate renal injury. A possible way is to identify biomarkers for high risk of radiation nephrotoxicity. The aim of this study was to investigate the potential of using urinary retinol binding protein (RBP), and blood valinhydantoin (VH) as biomarkers of nephrotoxicity on adult mice after 177Lu-octreotate treatment. BALB/c nude mice (n=6/group) were i.v. injected with 60 MBq or 120 MBq of 177Lu-octreotate. The control group was mock treated with saline. Spot urine samples were collected before injection, and 14, 30, 60 and 90 days after injection. Analysis of RBP4 and creatinine was performed using Mouse RBP4 ELISA kit and Creatinine kit from R&D Systems, respectively. Erythrocytes were separated from whole blood samples collected 90 days after injection, and analysed for VH by LC-MS/MS. The ratio between VH and a volumetric standard was calculated. The RBP/creatinine level increased with time in both groups given 177Lu-octreotate, with earlier and higher response for the 120 MBq group. No clear change in VH level between the different groups was observed. The result show that RBP may be a promising new biomarker for radiation induced kidney toxicity. The presently used method based on VH was not sensitive enough to be used as kidney toxicity marker. Further studies on mice are ongoing to validate if RBP4 may be efficient in predicting late nephrotoxicity. In patients, RBP/creatinine levels are followed in urine samples after treatment with 177Lu-octreotate.
8.
Langen, Britta, et al.
(author)
Transcriptional gene regulation in abdominal organs and the lung after i.v. injection of 211At in mouse
2012
In: Radiation research society. San Juan, Puerto Rico. 2012.
Conference paper (other academic/artistic) abstract
Astatine-211 (211At) is a promising radionuclide for radiation therapy with a nearly optimal biological effectiveness of emitted α-particles. Despite its potential, few studies have analysed 211At-induced normal tissue responses in vivo. In order to determine the quality and extent of 211At-induced cellular responses in vivo, the transcriptional gene regulation was analysed in the kidney cortex and medulla, liver, lung, and spleen. Female BALB/c nude mice were i.v. injected with 0.064, 0.64, 1.8, 14, and 42 kBq 211At and killed after 24h. Respective organs were excised and stored at -80°C until further analysis. Extracted total RNA was analysed with the Illumina MouseRef-8 Whole Genome Beadchip platform and data processing was performed with Nexus Expression 2.0. A common strong decrease in the total number of regulated transcripts was seen between 0.64 and 1.8 kBq 211At corresponding to absorbed doses between 2 and 50 mGy for all investigated tissues. Only minor responses in previously identified radiation-associated transcripts could be observed at any exposure. Among tissues at similar absorbed dose levels, the similarity in transcript up- and down-regulation decreased with increased absorbed dose. This phenomenon was more pronounced when the increase in absorbed dose corresponded also to an increase between 0.64 and 1.8 kBq 211At. Biological processes associated with regulated transcripts were categorised to assess the regulatory profiles in each tissue at a given exposure. These profiles showed distinct patterns which mirrored the threshold behaviour on the categorical and sub-categorical level of biological processes. The strong regulatory change demonstrated at the low absorbed doses in the tissues studied might be due to both radiation-induced effects of each tissue and physiological response from radiation-induced effects on the 211At-accumulating thyroid gland. These findings demonstrate the complexity of responses in vivo and highlight the need for a better understanding of the physiology when studying effects of ionizing radiation exposure.
9.
Schüler, Emil, et al.
(author)
Biological effects of 177Lu-octreotate therapy in mouse: in vivo normal kidney tissue response evaluated with gene expression microarray
2012
In: 58th Annual Meeting of the Radiation Research Society. San Juan, Puerto Rico. 2012.
Conference paper (other academic/artistic) abstract
The kidneys are the dose limiting organ when patients undergo 177Lu-octreotate therapy. The purpose of the present study was to investigate alterations in gene expression levels in the kidney following exposure to various absorbed doses of 177Lu. Female Balb/c mice were i.v. injected with 1.3-140 MBq 177Lu-octreotate, corresponding to an absorbed dose to the kidneys of 0.13-13 Gy. Control animals did not receive any 177Lu-octreotate. The animals were killed 24 hours after injection and the kidneys were removed, followed by dissection of the kidney medulla and cortex. Total RNA was extracted and processed using the Illumina Mouse-Ref-8 Whole-Genome Expression Beadchips to identify differentially expressed transcripts between irradiated and non-irradiated kidney tissues. The total number of differentially regulated transcripts was 480 and 281 in the kidney medulla and cortex, respectively. Of these, 39 and 32 transcripts were regulated at all absorbed doses in the two renal tissues. Of the affected biological processes, three and five processes were affected at all absorbed dose levels in the medulla and cortex, respectively; glycerol metabolism, immune response, and defense response in the medulla, and immune response, amino acid transport, circadian rhythm, rhythmic processes, and regulation of lipoprotein lipase activity in the cortex. In general, metabolic processes were strongly expressed at all absorbed dose levels studied, however, inversely related to increasing absorbed dose. Furthermore, cellular and developmental processes were strongly associated with kidney medulla, while a strong association with transport and immune response was seen in kidney cortex. The results demonstrate distinct differences in the response seen after 177Lu exposure to different absorbed doses. Effects on metabolism and stress responses were frequently seen, while no processes associated with maintaining DNA integrity were found, which indicates a very diverse response following 177Lu exposure.
10.
