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H O Hansen

Publications and source records attributed to H O Hansen.

18 recordsLinked to original sources
PubMed1999

Trends in overweight and obesity among 18-year-old males in Sweden between 1971 and 1995.

The aims of the study are to analyse Swedish trends in overweight and obesity-as measured by body mass index (BMI)-between 1971 and 1995, and to examine socioeconomic and geographic differences between groups of individuals on the basis of information on 18-y-old military conscripts. The study population comprises all males born in 1953, 1958, 1963, 1968, and between 1973 and 1977, reported to be living in Sweden at 17 y of age according to nationwide population registers (RTPs). Utilizing the unique personal ID number, sociodemographic data in the RTPs and in Population and Housing censuses were linked to data on BMI in the national Military Service Conscription Registry for the years 1971 to 1995. These data were obtained from compulsory medical examinations held at military induction at 18 y of age. BMI data were available for 448 732 (89%) of a total of 503 689 subjects. Mean BMI increased by 6.6% over the study period-from 21.1 kg/m2 in 1971 to 22.4 kg/m2 in 1995. Unadjusted trend analyses showed a 2.4 times increase in the prevalence of overweight among 18-y-old males over the period-from 6.9% in 1971 to 16.3% in 1995. Over the same years, the prevalence of obesity increased 3.5 times-from 0.9% to 3.2%. After adjustment for muscle power, demographic factors, and living area, the prevalence of overweight was found to have increased 1.4 times, and obesity 1.7 times between 1971 and 1993. The prevalence of overweight was considerably higher among 18-y-old males from low-educated families than among those from high-educated families in both 1971 and 1995. The prevalence of overweight was also found to be higher in both 1971 and 1995 among young men from rural and/or sparsely populated areas than among those living in Sweden's largest cities. Mean BMI, and the prevalence of overweight and obesity have increased among 18-y-old males in Sweden over the last 24 y. The increased risk of overweight among young men from low-educated families and those from rural and/or sparsely populated areas detected in 1971 was still evident in 1995.

Adolescent↗
PubMed1997

Heteroaryl analogues of AMPA. Synthesis and quantitative structure-activity relationships.

A number of 3-isoxazolol bioisosteres, 7a-i, of (S)-glutamic acid (Glu), in which the methyl group of (RS)-2-amino-3-(3-hydroxy-5-methylisoxazol-4-yl)propionic acid (AMPA, 1) was replaced by different 5-membered heterocyclic rings, were synthesized. Comparative in vitro pharmacological studies on this series of AMPA analogues were performed using receptor binding assays (IC50 values) and the electrophysiological rat cortical slice model (EC50 values). None of these compounds showed detectable affinity for the N-methyl-D-aspartic acid subtype of Glu receptors. Some of the compounds were weak inhibitors of [3H]kainic acid binding. The inhibitory effects on [3H]AMPA binding and agonist potencies at AMPA receptors of 7a-i were strictly dependent on the structure, electrostatic potential, and methyl substitution of the heterocyclic 5-substituent. Thus, while 7a (IC50 = 0.094 microM; EC50 = 2.3 microM) was approximately equipotent with AMPA (IC50 = 0.023 microM; EC50 = 5.4 microM), (RS)-2-amino-3-[3-hydroxy-5-(1H-imidazol-2-yl)isoxazol-4-yl]propio nic acid (7b) (IC50 = 48 microM; EC50 = 550 microM) was some 2 orders of magnitude weaker than AMPA, and (RS)-2-amino-3-[3-hydroxy-5-(1-methyl-1H-imidazol-2-yl)-isoxazol-4 -yl] propionic acid (7c) (IC50 > 100 microM; EC50 > 1000 microM) was inactive. Furthermore, (RS)-2-amino-3-[3-hydroxy-5-(2-methyl-2H-tetrazol-5-yl)isoxazol -4-yl] propionic acid (7i) (IC50 = 0.030 microM; EC50 = 0.92 microM) was more potent than AMPA, whereas its N-1 methyl isomer, (RS)-2-amino-3-[3-hydroxy-5-(1-methyl-1H-tetrazol-5-yl)isoxazol -4-yl] propionic acid (7h) (IC50 = 54 microM; EC50 > 1000 microM) was inactive as an AMPA agonist. A quantitative structure-activity relationship (QSAR) analysis revealed a positive correlation between receptor affinity, electrostatic potential near the nitrogen atom at the "ortho" position of the heterocyclic 5-substituent, and the rotational energy barrier around the bond connecting the two rings. We envisage that a hydrogen bond between the protonated amino group and an ortho-positioned heteroatom of the ring substituent at the 5-position stabilize receptor-active conformations of these AMPA analogues.

Animals↗
PubMed1995

Enhanced D1 affinity in a series of piperazine ring substituted 1-piperazino-3-arylindans with potential atypical antipsychotic activity.

A study of the effect of aromatic substitution on D1 and D2 affinity in a series of previously reported trans-1-piperazino-3-phenylindans shows similar structure-activity relationships for the two receptor sites. 6-Substituted derivatives have affinity for both receptors, and 6-chloro-or 6-fluoro-substituted derivatives show preference for D1 receptors. D1 affinity and selectivity are significantly increased in a series of new piperazine ring substituted derivatives. Potent D1 and D2 antagonism in vivo are confined to derivatives with relatively small substituents in the 2-position of the piperazine ring (e.g. 2-methyl,2,2-dimethyl, 2-spirocyclobutyl or 2-spirocyclopentyl). Consequently, the effect of aromatic substitution is examined in a series of 1-(2,2-dimethylpiperazino)-3-arylindans. All these compounds except the 4-, 5-, 7- and 4'-chloro-substituted derivatives have potent D1 affinity (IC50's below 10 nM) and the majority of the compounds antagonize SK&F 38393-induced circling in 6-OHDA-lesioned rats with ED50 values about 1 mumol/kg. In vitro all compounds show preference for D1 receptors, but in vivo they are equally effective as D1 and D2 antagonists. The compounds have high affinity for 5-HT2 receptors and selected compounds show high affinity for alpha 1 adrenoceptors. Furthermore, a subgroup consisting of (-)-38, (-)-39, (-)-41, and (-)-54 does not induce catalepsy in rats. These compounds have the potential of being "atypical" antipsychotics and have consequently been selected for further studies. The non-receptor-blocking enantiomers are shown to be inhibitors of DA and NE uptake in accordance with previous observations in compounds unsubstituted in the piperazine ring. Two compounds, (+)-38 and (+)-40, block DA uptake with IC50 values below 10 nM. Finally, the observed structure-activity relationships are discussed in relation to previously published pharmacophore models for D2 and 5-HT2 receptors. It is concluded that the piperazine substituents might induce a different binding mode at the dopamine receptor sites, perhaps only at the D1 receptor site.

2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-ben↗
PubMed1992

Influence of dietary sources of fat on lipid synthesis in mink (Mustela vison) mammary tissue.

1. The fatty acid composition of the triglyceride fraction of mink milk sampled during mid-lactation (day 28 post partum) from two nursing mink was compared to that of plasma samples and to the fatty acid composition of the feed rations used. 2. Chemical analysis of the triglyceride composition of mink milk demonstrated only minute concentrations of fatty acids with a chain length below C14. 3. The saturated C16:0- and C18:0-unit fatty acids in mink milk made up for 24-40% of the total amount of fatty acids extracted, the remainder being represented by mono and polyunsaturated long-chain (C16-C24) fatty acids. 4. Preliminary in vitro experiments proved the incorporation of 14C-labelled glucose, acetate or palmitate into triacylglycerols in cultures of mink mammary tissue to be linear for at least 2 hr. 5. The in vitro capacity for de novo fatty acid synthesis in mink mammary tissue using 14C-labelled glucose or acetate was low, i.e. ranging from 0.096-0.109 nmol/g (fresh tissue)/min, and amounted to only about 5% of that obtained in the case of [14C]palmitic acid incubation. 6. Following 14C-labelled acetic or palmitic acid incubation of mink mammary tissue neither desaturation nor chain elongation was observed. 7. In response to long-term feeding on rations with two different sources of animal fat (F = fish oil or L = lard) the influence of compositional changes in dietary neutral lipids on the fatty acid composition of the lipids of mink milk is discussed.

Animals↗
PubMed1991

Induction of acyl-CoA-binding protein and its mRNA in 3T3-L1 cells by insulin during preadipocyte-to-adipocyte differentiation.

The induction of acyl-CoA-binding protein (ACBP) and ACBP mRNA was investigated in 3T3-L1 cells during growth and insulin-induced differentiation. The level of ACBP relative to both total soluble protein and DNA increased during insulin-stimulated conversion of 3T3-L1 cells from preadipocytes into fully developed adipocytes. So did the total rate of lipogenesis, as measured by incorporation of [1-14C]acetate. A similar increase in ACBP mRNA relative to total RNA was observed. These results therefore suggest that ACBP plays a specific role in the lipogenic process. However, this role might be indirect, as the increase in lipogenesis preceded the increase in ACBP. The significance of this finding is discussed.

Acetates↗
PubMed1991

Lactating goat mammary gland cells in culture.

1. Isolated mammary gland cells were cultured embedded in collagen gels or as monolayers on floating collagen gels. Under these conditions the cells were able to grow for at least 6 weeks during five passages. Growth was sustained in M199/F12 (1:1) supplemented with insulin, hydrocortisone, epidermal growth factor, tri-iodothyronine, estradiol and bovine serum albumin. 2. The cells secreted lactose into the medium in significant amounts throughout the culture period. 3. Prolactin had a slightly stimulatory effect as had fetal bovine serum on growth and protein synthesis, but none of these factors were obligatory in this respect. Insulin-like growth factor I (Somatomedin C) could replace high concentrations of insulin whereas bovine growth hormone had no detectable effect. 4. Depending on the hormone content of the medium and the age of the culture, different labelling patterns of the arachidonic acid-containing phospholipids were observed. The effect of prolactin on phosphatidyl inositol and arachidonic acid metabolism was studied.

Animals↗
PubMed1989

Acyl-CoA-binding protein in the rat. Purification, binding characteristics, tissue concentrations and amino acid sequence.

Acyl-CoA-binding protein (ACBP) was purified from rat liver. The Mr was determined as 9932 +/- 10 by mass spectrometry and calculated as 9937.8 from the sequence. The protein binds acyl-CoA esters (C8-C16) with high affinity, but was unable to bind fatty acids. ACBP was found mainly (86%) in the soluble fraction, and the concentration was highest in liver, 5-6 micrograms/mg of soluble protein. The complete primary structure was determined by a combination of gas-phase Edman degradations and mass spectrometry. Extensive use of 252Cf plasma-desorption mass spectrometry facilitated the identification and verification of peptides. Comparison with the previously determined sequence of bovine acyl-CoA-binding protein revealed a very strong sequence similarity (83%), and all of the differences could be accounted for by single base changes.

Acyl Coenzyme A↗
PubMed1987

A novel acyl-CoA-binding protein from bovine liver. Effect on fatty acid synthesis.

Bovine liver was shown to contain a hitherto undescribed medium-chain acyl-CoA-binding protein. The protein co-purifies with fatty-acid-binding proteins, but was, unlike these proteins, unable to bind fatty acids. The protein induced synthesis of medium-chain acyl-CoA esters on incubation with goat mammary-gland fatty acid synthetase. The possible function of the protein is discussed.

Animals↗
PubMed1987

Effect of exogenous long-chain fatty acids on lipid biosynthesis in dispersed ruminant mammary gland epithelial cells: esterification of long-chain exogenous fatty acids.

Dispersed epithelial cells from lactating bovine and goat mammary glands incorporated acetate into all fatty acids (C4 to C16) that were incorporated into mainly triacylglycerols. The cells secreted free fatty acids only into the incubation medium, and this secretion was dependent on the concentration of albumin and the type and amount of exogenous fatty acid added to the medium. Addition of palmitic acid to the incubation medium stimulated synthesis and incorporation of fatty acids synthesized de novo into triacylglycerols, whereas stearic and linoleic acid were inhibitory.

Acetates↗
PubMed1987

Effect of exogenous long-chain fatty acids on individual fatty acid synthesis by dispersed ruminant mammary gland cells.

We investigated the effect of exogenously added fatty acids on de novo synthesis of individual fatty acids and their incorporation into triacylglycerols by dispersed lactating ruminant mammary gland epithelial cells. Palmitate addition strongly stimulated synthesis and incorporation of butyrate and, to a smaller extent, palmitate synthesis and incorporation. Oleic acid strongly inhibited synthesis of all fatty acids except butyrate, whereas the effect of lauric acid was nearly neutral. Free fatty acid depletion of the mammary gland cells potentiated the effect of palmitate and made oleate less inhibitory.

Animals↗
PubMed1986

Synthesis of milk specific fatty acids and proteins by dispersed goat mammary-gland epithelial cells.

The method now described for preparation of dispersed lactating goat mammary-gland cells gives a high yield of morphologically and functionally normal mammary cells. The cells synthesize specific goat milk fatty acids in the right proportions, and they respond to hormones by increased protein synthesis. The cells can be frozen and thawed without losing the above properties, which makes them an excellent tool for metabolic and hormonal studies.

Acetates↗
PubMed1986

Absence of monoacylglycerol pathway for triacylglycerol synthesis in goat mammary gland.

Both subcellular fractions of lactating goat mammary gland and dispersed lactating goat mammary-gland cells were able to incorporate [U-3H]2-O-hexadecylglycerol into monoalkyl-monoacylglycerol. However, the incorporation of [U-3H]2-O-hexadecylglycerol into monoalkyl-monoacylglycerol by dispersed cells was not accompanied by incorporation of fatty acid synthesized de novo or added radiolabelled fatty acid. The result therefore shows that an active monoacylglycerol pathway does not exist in goat mammary gland.

Acetates↗
PubMed1984

Triacylglycerol synthesis in goat mammary gland. The effect of ATP, Mg2+ and glycerol 3-phosphate on the esterification of fatty acids synthesized de novo.

Goat mammary-gland microsomal fraction by itself induces synthesis of medium-chain-length fatty acids by goat mammary fatty acid synthetase and incorporates short- and medium-chain fatty acids into triacylglycerol. Addition of ATP in the absence or presence of Mg2+ totally inhibits triacylglycerol synthesis from short- and medium-chain fatty acids, and severely inhibits synthesis de novo of medium-chain fatty acids. The inhibition by ATP of fatty acid synthesis and triacylglycerol synthesis de novo can be relieved by glycerol 3-phosphate. The effect of ATP could not be mimicked by the non-hydrolysable ATP analogue, adenosine 5'-[beta,gamma-methylene]triphosphate and could not be shown to be caused by inhibition of the diacylglycerol acyltransferase by a phosphorylation reaction. Possible explanations for the mechanism of the inhibition by ATP are discussed, and a hypothetical model for its action is outlined.

Adenosine Triphosphate↗
PubMed1984

Triacylglycerol synthesis in goat mammary gland. Factors influencing the esterification of fatty acids synthesized de novo.

ATP alone had no effect on incorporation of fatty acids synthesized de novo and membrane-bound diacylglycerol into triacylglycerol. Combined addition of ATP and Mg2+ totally inhibits incorporation of fatty acids synthesized de novo and stimulated incorporation of membrane-bound diacylglycerol. ATP, Mg2+ and glycerol 3-phosphate stimulate incorporation of fatty acids synthesized de novo into triacylglycerol, but inhibited the incorporation of membrane-bound diacylglycerol. Diacylglycerol generated in situ was shown to be superior to diacylglycerols preloaded on the membrane as substrate for the diacylglycerol acyltransferase. A model is proposed to explain the effect of absorbed exogenous fatty acid on fatty acid synthesis de novo in goat mammary gland.

Acyltransferases↗
PubMed1981

Experiments in modelling recent Danish fertility curves.

This paper reports the outcome of an exercise in curve fitting to annual sets of Danish age-specific fertility rates for the years 1962 to 1971 by means of least squares. Functions fitted were a cubic spline, the Hadwiger and Coale-Trussell functions, the gamma and beta densities, two versions of a polynomial, and two of Brass's relational procedures, as well as the Gompertz curve. The spline function fitted all curves far better than any of the others. The Coale-Trussell procedure and gamma density were about equal, followed by the Hadwiger function. All of these functions fit the data wells. One of the polynomials fit reasonably well, but the rest of the functions were less accurate.

Adolescent↗