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Biomedical subjects

G Mellgren

Publications and source records attributed to G Mellgren.

42 records · Page 3Linked to original sources
PubMed1979

Metabolic substrates, muscle fibre composition and fibre size in late walking and normal children.

In 10 children with delayed walking, muscle specimens were obtained by needle biopsy from the vastus lateralis muscle for determination of ATP, creatine phosphate (CP), glycogen and lactate concentration, as well as fibre composition and fibre size. The values obtained are compared with corresponding results for a control group of 25 children aged 2 months--11 years. Details of the control series are given and its validity as a reference group is discussed. Six children (group I) who showed minor gross motor delay but otherwise normal development at follow-up were found to have lowered ATP, CP and glycogen concentrations, compared to 4 children (group II) who had general developmental delay, and to the control group. The children in group I were shown to have smaller fibre size and a greater difference between type 1 and 2 fibres than the children in group II and in the control group. No differences in the concentrations of metabolic substrates or the morphometric values could be detected between group II and the control group.

Adenosine Triphosphate↗
PubMed1979

[Experiences about ductus arteriosus closure with congenital diaphragmatic hernia (author's transl)].

Ten cases of posterolateral diaphragmatic hernia have been operated upon the last two years. Three cases of these have successfully been operated in conventional way. In seven cases ductus arteriosus was closed. Only two cases survived. A preoperative evaluation is to be done. Depending on the blood-gas-analysis, the cases can be divided into cases belonging to the survival zone and cases belonging to the fatal zone according to Boix-Ochoa. If it is possible to increase the oxygen uptake and to expire the carbonic acid, the results seem to be good after conventional operation. If it not will be possible to increase the oxygen saturation and not even possible to reduce the CO2 pressure with a ventilator with 100 per cent oxygen, the cases are to be considered inoperable. In fatal zone cases, where a reduction of PCO2 is possible, but there are no possibilities to get an increased oxygen saturation, an operative closing of ductus can be tried if heart anoxia is treated with the aid of an oxygenator.

Carbon Dioxide↗
PubMed1976

Human adipose tissue in culture. VI. Effect of age on cell size and lipolysis.

Biopsies of subcutaneous adipose tissue were taken from children varying in age from a few hours to 15 years. In 63 children the cell diameter was determined. Weight in relation to height was normal. At an average the fat cell weight was 0.05 mug in the new-born, but adolescent values were reached within the first year of life. Biopsies from 23 children were incubated for one week in vitro. Cell size was not changed significantly during this period. Glycerol release was strongly correlated to cell size and the long-term effect of insulin on the lipolysis was found to be stimulating as previously shown for adults. At the same cell size basal lipolysis was higher in children below one year of age than later in life. It is concluded that the tissue culture method may be used for studies of adopose tissue from children. Furthermore, the data indicate that there is a difference in adipose tissue metabolism and cell size of children below one year as compared to older children and adults.

Adipose Tissue↗
PubMedDate not supplied

Biochemical and functional analysis of nuclear receptors as targets in cAMP-dependent control of bovine CYP17.

Several lines of evidence have suggested that the nuclear receptor Steroidogenic Factor-1 (SF-1 or Ad4BP) may be directly involved in the cAMP-dependent regulation of steroid hydroxylase genes in adrenocortical cells. In the bovine CYP17 gene, which encodes the cytochrome P450 17alpha-hydroxylase, an SF-1 site is present within cAMP-responsive sequence 2 (CRS2) and mutations which interfere with SF-1 binding correlate with decreases in cAMP-stimulated transcription of a linked reporter gene. In order to determine whether the cAMP response relies on structures within SF-1 itself, mutations and deletions were introduced. We demonstrate that even a single point mutation (E454A) in the transactivating AF-2 domain drastically reduces the ability of SF-1 to mediate cAMP-dependent transcription. Furthermore, the mutation results in a protein which acts in a dominant negative fashion with respect to cAMP-dependent regulation of the bovine CYP17 gene. Finally, we demonstrate that the coactivators CBP and SRC-1 are limiting with respect to cAMP-induced CRS2-dependent transcription in Y1 adrenocortical tumor cells, suggesting that part of the action of cAMP may be to influence the interaction of SF-1 with other cofactors via the AF-2 domain.

Adrenal Cortex Neoplasms↗