peter cibur - Academia.edu (original) (raw)

Papers by peter cibur

Research paper thumbnail of Local Transcutaneous Cooling of the Spinal Cord in the Rat: Effects on Long-Term Outcomes After Compression Spinal Cord Injury

International Journal of Neuroscience, 2008

This study tested efficiency of a novel thermoelectric cooler for local transcutaneous spinal cor... more This study tested efficiency of a novel thermoelectric cooler for local transcutaneous spinal cord cooling. Spinal cord compression was made by epidural balloon inflation at T8-T9 level of the spinal cord. Experimental animals (n=20) were divided into two groups. In the hypothermic group, local cooling started 25 min after spinal cord injury and lasted for 1 h with paravertebral temperature maintained at 28.5 degrees C (+/-0.3). Normothermic group underwent identical procedures, but their temperature was maintained normothermic. The assessment of neurologic recovery was performed once a week during a 4 weeks survival period. After 4 weeks animals were sacrificed and the extent of the spinal cord lesion morphometrically evaluated. There were no statistically significant intergroup differences in BBB scores and preserved volumes of the spinal cord tissue. In consecutive cross-sectional areas, hypothermic animals had significantly more preserved white matter at the cranial periphery of the lesion. It was concluded that mild posttraumatic hypothermia (31.8 degrees C) had some protective effect on tissue loss after spinal cord injury but this effect was not associated with functional improvement.

Research paper thumbnail of Serum S100B protein in early management of patients after mild traumatic brain injury

European Journal of Neurology, 2009

Background and purpose: Neuronal protein S100B assays are available now with a perspective of be... more Background and purpose: Neuronal protein S100B assays are available now with a perspective of being an early screening tool for serious intracranial injury. The aim of the study was to correlate early S100B measurements and initial CCT findings in the patients sustaining mild traumatic brain injury (MTBI).Methods: The prospective study included patients of all ages with a history of MTBI. CCT scans and venous blood sampling for S100B analysis were performed within 6 h after injury. Levels of S100B above 0.1 ng/ml (S100B+) and any CCT detectable trauma-relevant intracranial lesions were considered positive (CCT+).Results: A series of 102 patients were involved in the study. CCT+ scans were present in eighteen (17.6%) and CCT- scans in 84 (82.4%) patients. There were 74 (72.5%) patients in S100B+ and 28 (27.5%) in S100B− group. Sensitivity of S100B assay attained 83.3% with a negative predictive value of 89.3%. Three patients from CCT+ group had negative plasma level of S100B. Two of them required surgical treatment.Discussion: S100B serum protein marker seems to be an unrealiable screening tool for determination of an intracranial injury risk group due to low sensitivity and negative predictive value seen from samples taken greater than 3 h after an MTBI.

Research paper thumbnail of Collagen/hyaluronan membrane as a scaffold for chondrocytes cultivation

Biologia, 2009

Rabbit chondrocytes were cultivated in vitro using the collagen/hyaluronan membrane. The membrane... more Rabbit chondrocytes were cultivated in vitro using the collagen/hyaluronan membrane. The membrane did not show any adverse effects on chondrocyte viability during in vitro cultivation. The inoculated cells grew without any negative changes. According to the histochemical analyses: (i) hematoxylin and eosin; (ii) safranin O; and (iii) rabbit anti-human collagen type II staining, the rabbit chondrocytes maintained their morphology and phenotype during in vitro cultivation. The collagen/hyaluronan membrane became more stable and stiffer after long time cultivation. The proliferation of the chondrocytes stabilised the structure of the membrane. The collagen/hyaluronan membrane is suitable material for the chondrocyte growth and could provide functional tissue-engineered scaffold for cartilage repair.

Research paper thumbnail of Assessment of the proliferation of human mesenchymal stromal cells in the presence of human demineralised bone matrix

Biologia, 2009

Tissue engineering integrates discoveries from biochemistry, cell and molecular biology, material... more Tissue engineering integrates discoveries from biochemistry, cell and molecular biology, material science and biomedical engineering to produce innovative three-dimensional composites that can be used to replace or correct damaged tissues and organs. Precise classification of osteoinductive properties of human demineralised bone is often the problem, because it varies from batch to batch. An in vitro assay using bone marrow derived human mesenchymal stromal cells (hMSCs) was developed to improve the classification of the osteoinductive quality of demineralised bone matrix. In this study, three-dimensional, partially demineralised bone scaffolds were investigated for their ability to induce osteogenic differentiation of hMSCs in vitro. Proliferation of the hMSCs was measured by the CelTiter 96® AQueous One Solution Cell assay. Chemical structure was evaluated using quantitative and qualitative X-ray analysis. Scanning electron microscopy revealed primary proliferation of the cells cultivated 14 days and showed elevations in the content of Ca2+. These results demonstrate that partially demineralised human bone material supports osteogenic differentiation of hMSCs in vitro. This study documents that in vitro test using hMSCs can be used for classification of the osteoinductive quality of human demineralised bone matrix.

Research paper thumbnail of Collagen/hyaluronan membrane as a scaffold for chondrocytes cultivation

Biologia, 2009

Rabbit chondrocytes were cultivated in vitro using the collagen/hyaluronan membrane. The membrane... more Rabbit chondrocytes were cultivated in vitro using the collagen/hyaluronan membrane. The membrane did not show any adverse effects on chondrocyte viability during in vitro cultivation. The inoculated cells grew without any negative changes. According to the histochemical analyses: (i) hematoxylin and eosin; (ii) safranin O; and (iii) rabbit anti-human collagen type II staining, the rabbit chondrocytes maintained their morphology and phenotype during in vitro cultivation. The collagen/hyaluronan membrane became more stable and stiffer after long time cultivation. The proliferation of the chondrocytes stabilised the structure of the membrane. The collagen/hyaluronan membrane is suitable material for the chondrocyte growth and could provide functional tissue-engineered scaffold for cartilage repair.

Research paper thumbnail of Assessment of the proliferation of human mesenchymal stromal cells in the presence of human demineralised bone matrix

Biologia, 2009

Tissue engineering integrates discoveries from biochemistry, cell and molecular biology, material... more Tissue engineering integrates discoveries from biochemistry, cell and molecular biology, material science and biomedical engineering to produce innovative three-dimensional composites that can be used to replace or correct damaged tissues and organs. Precise classification of osteoinductive properties of human demineralised bone is often the problem, because it varies from batch to batch. An in vitro assay using bone marrow derived human mesenchymal stromal cells (hMSCs) was developed to improve the classification of the osteoinductive quality of demineralised bone matrix. In this study, three-dimensional, partially demineralised bone scaffolds were investigated for their ability to induce osteogenic differentiation of hMSCs in vitro. Proliferation of the hMSCs was measured by the CelTiter 96® AQueous One Solution Cell assay. Chemical structure was evaluated using quantitative and qualitative X-ray analysis. Scanning electron microscopy revealed primary proliferation of the cells cultivated 14 days and showed elevations in the content of Ca2+. These results demonstrate that partially demineralised human bone material supports osteogenic differentiation of hMSCs in vitro. This study documents that in vitro test using hMSCs can be used for classification of the osteoinductive quality of human demineralised bone matrix.

Research paper thumbnail of Local Transcutaneous Cooling of the Spinal Cord in the Rat: Effects on Long-Term Outcomes After Compression Spinal Cord Injury

International Journal of Neuroscience, 2008

This study tested efficiency of a novel thermoelectric cooler for local transcutaneous spinal cor... more This study tested efficiency of a novel thermoelectric cooler for local transcutaneous spinal cord cooling. Spinal cord compression was made by epidural balloon inflation at T8-T9 level of the spinal cord. Experimental animals (n=20) were divided into two groups. In the hypothermic group, local cooling started 25 min after spinal cord injury and lasted for 1 h with paravertebral temperature maintained at 28.5 degrees C (+/-0.3). Normothermic group underwent identical procedures, but their temperature was maintained normothermic. The assessment of neurologic recovery was performed once a week during a 4 weeks survival period. After 4 weeks animals were sacrificed and the extent of the spinal cord lesion morphometrically evaluated. There were no statistically significant intergroup differences in BBB scores and preserved volumes of the spinal cord tissue. In consecutive cross-sectional areas, hypothermic animals had significantly more preserved white matter at the cranial periphery of the lesion. It was concluded that mild posttraumatic hypothermia (31.8 degrees C) had some protective effect on tissue loss after spinal cord injury but this effect was not associated with functional improvement.

Research paper thumbnail of Serum S100B protein in early management of patients after mild traumatic brain injury

European Journal of Neurology, 2009

Background and purpose: Neuronal protein S100B assays are available now with a perspective of be... more Background and purpose: Neuronal protein S100B assays are available now with a perspective of being an early screening tool for serious intracranial injury. The aim of the study was to correlate early S100B measurements and initial CCT findings in the patients sustaining mild traumatic brain injury (MTBI).Methods: The prospective study included patients of all ages with a history of MTBI. CCT scans and venous blood sampling for S100B analysis were performed within 6 h after injury. Levels of S100B above 0.1 ng/ml (S100B+) and any CCT detectable trauma-relevant intracranial lesions were considered positive (CCT+).Results: A series of 102 patients were involved in the study. CCT+ scans were present in eighteen (17.6%) and CCT- scans in 84 (82.4%) patients. There were 74 (72.5%) patients in S100B+ and 28 (27.5%) in S100B− group. Sensitivity of S100B assay attained 83.3% with a negative predictive value of 89.3%. Three patients from CCT+ group had negative plasma level of S100B. Two of them required surgical treatment.Discussion: S100B serum protein marker seems to be an unrealiable screening tool for determination of an intracranial injury risk group due to low sensitivity and negative predictive value seen from samples taken greater than 3 h after an MTBI.

Research paper thumbnail of Collagen/hyaluronan membrane as a scaffold for chondrocytes cultivation

Biologia, 2009

Rabbit chondrocytes were cultivated in vitro using the collagen/hyaluronan membrane. The membrane... more Rabbit chondrocytes were cultivated in vitro using the collagen/hyaluronan membrane. The membrane did not show any adverse effects on chondrocyte viability during in vitro cultivation. The inoculated cells grew without any negative changes. According to the histochemical analyses: (i) hematoxylin and eosin; (ii) safranin O; and (iii) rabbit anti-human collagen type II staining, the rabbit chondrocytes maintained their morphology and phenotype during in vitro cultivation. The collagen/hyaluronan membrane became more stable and stiffer after long time cultivation. The proliferation of the chondrocytes stabilised the structure of the membrane. The collagen/hyaluronan membrane is suitable material for the chondrocyte growth and could provide functional tissue-engineered scaffold for cartilage repair.

Research paper thumbnail of Assessment of the proliferation of human mesenchymal stromal cells in the presence of human demineralised bone matrix

Biologia, 2009

Tissue engineering integrates discoveries from biochemistry, cell and molecular biology, material... more Tissue engineering integrates discoveries from biochemistry, cell and molecular biology, material science and biomedical engineering to produce innovative three-dimensional composites that can be used to replace or correct damaged tissues and organs. Precise classification of osteoinductive properties of human demineralised bone is often the problem, because it varies from batch to batch. An in vitro assay using bone marrow derived human mesenchymal stromal cells (hMSCs) was developed to improve the classification of the osteoinductive quality of demineralised bone matrix. In this study, three-dimensional, partially demineralised bone scaffolds were investigated for their ability to induce osteogenic differentiation of hMSCs in vitro. Proliferation of the hMSCs was measured by the CelTiter 96® AQueous One Solution Cell assay. Chemical structure was evaluated using quantitative and qualitative X-ray analysis. Scanning electron microscopy revealed primary proliferation of the cells cultivated 14 days and showed elevations in the content of Ca2+. These results demonstrate that partially demineralised human bone material supports osteogenic differentiation of hMSCs in vitro. This study documents that in vitro test using hMSCs can be used for classification of the osteoinductive quality of human demineralised bone matrix.

Research paper thumbnail of Collagen/hyaluronan membrane as a scaffold for chondrocytes cultivation

Biologia, 2009

Rabbit chondrocytes were cultivated in vitro using the collagen/hyaluronan membrane. The membrane... more Rabbit chondrocytes were cultivated in vitro using the collagen/hyaluronan membrane. The membrane did not show any adverse effects on chondrocyte viability during in vitro cultivation. The inoculated cells grew without any negative changes. According to the histochemical analyses: (i) hematoxylin and eosin; (ii) safranin O; and (iii) rabbit anti-human collagen type II staining, the rabbit chondrocytes maintained their morphology and phenotype during in vitro cultivation. The collagen/hyaluronan membrane became more stable and stiffer after long time cultivation. The proliferation of the chondrocytes stabilised the structure of the membrane. The collagen/hyaluronan membrane is suitable material for the chondrocyte growth and could provide functional tissue-engineered scaffold for cartilage repair.

Research paper thumbnail of Assessment of the proliferation of human mesenchymal stromal cells in the presence of human demineralised bone matrix

Biologia, 2009

Tissue engineering integrates discoveries from biochemistry, cell and molecular biology, material... more Tissue engineering integrates discoveries from biochemistry, cell and molecular biology, material science and biomedical engineering to produce innovative three-dimensional composites that can be used to replace or correct damaged tissues and organs. Precise classification of osteoinductive properties of human demineralised bone is often the problem, because it varies from batch to batch. An in vitro assay using bone marrow derived human mesenchymal stromal cells (hMSCs) was developed to improve the classification of the osteoinductive quality of demineralised bone matrix. In this study, three-dimensional, partially demineralised bone scaffolds were investigated for their ability to induce osteogenic differentiation of hMSCs in vitro. Proliferation of the hMSCs was measured by the CelTiter 96® AQueous One Solution Cell assay. Chemical structure was evaluated using quantitative and qualitative X-ray analysis. Scanning electron microscopy revealed primary proliferation of the cells cultivated 14 days and showed elevations in the content of Ca2+. These results demonstrate that partially demineralised human bone material supports osteogenic differentiation of hMSCs in vitro. This study documents that in vitro test using hMSCs can be used for classification of the osteoinductive quality of human demineralised bone matrix.