Previous studies have shown effects of high-protein diets, especially whey protein, on energy expenditure and satiety, yet a possible distinction between the effects of whey or alpha-lactalbumin has not been made. The present study assessed the effects of the addition of total whey protein (whey) or caseinomacropeptide-depleted alpha-lactalbumin-enriched whey protein (alpha-lac) to a breakfast yoghurt drink on energy expenditure and appetite suppression in human subjects. A total of eighteen females and seventeen males (aged 20.9 (sd 1.9) years; BMI 23.0 (sd 2.1) kg/m2) participated in an experiment with a randomised, three-arm, cross-over design where diet-induced energy expenditure, respiratory quotient and satiety were measured. Breakfasts were isoenergetic and subject-specific: a normal-protein (NP) breakfast consisting of whole milk (15, 47 and 38 % energy from protein, carbohydrate and fat, respectively), a high-protein (HP) breakfast with additional whey or a HP breakfast containing alpha-lac (41, 47 and 12 % energy from protein, carbohydrate and fat, respectively). Resting energy expenditure did not differ between the three conditions. HP breakfasts (area under the curve: whey, 217.1 (se 10.0) kJ x 4 h; alpha-lac, 234.3 (se 11.6) kJ x 4 h; P < 0.05) increased diet-induced thermogenesis more compared with a NP yoghurt at breakfast (179.7 (se 10.9) kJ x 4 h; P < 0.05). Hunger and desire to eat were significantly more suppressed after alpha-lac (hunger, - 6627 (se 823); desire to eat, - 6750 (se 805) mm visual analogue scale (VAS) x 4 h; P < 0.05) than after the whey HP breakfast (hunger, - 5448 (se 913); desire to eat, - 5070 (se 873) mm VAS x 4 h; P < 0.05). After the HP breakfasts, a positive protein balance occurred (alpha-lac, 0.35 (sd 0.18) MJ/4 h; whey, 0.37 (sd 0.20) MJ/4 h; P < 0.001); after the NP breakfast a positive fat balance occurred (1.03 (sd 0.29) MJ/4 h; P < 0.001). In conclusion, consumption of a breakfast yoghurt drink with added whey or alpha-lac increased energy expenditure, protein balance and decreased fat balance compared with a NP breakfast. The alpha-lac-enriched yoghurt drink suppressed hunger and the desire to eat more than the whey-enriched yoghurt drink.
This study was carried out to identify the cellular component activating the histamine-stimulated Ca2+ entry in vas-deferensderived DDT1 MF-2 cells. H1-histaminoceptor stimulation resulted in a rise in intracellular Ca2+ concentration, caused by Ca2+ release from inositol phosphate-sensitive Ca2+ stores and Ca2+ entry from the extracellular space, accompanied by a transient Ca2+-activated outward K+ current. The histamineevoked K+ current was still observed after preventing inositol phosphate-induced Ca2+ mobilization by intracellularly applied heparin. This current was activated by Ca2+ entry from the extracellular space, because it was abolished in the presence of the Ca2+-channel blocker La3+ or under Ca2+-free conditions. Hhistaminoceptor-activated Ca2+ entry was also observed in the presence ofintracellularly applied Ins(1,4,5)P3 and Ins(1,3,4,5)P4, depleting their respective Ca2+ stores and pre-activating the inositol phosphate-regulated Ca2+ entry. Thus the ability of histamine to activate Ca2+ entry independently of Ca2+ mobilization and the formation of inositol phosphates suggests that another component is involved to initiate the Ca2+-entry process.
1 The effects of the specific protein kinase C (PKC) inhibitor, GF109203X, were measured on the cytoplasmic Ca2" concentration ([Ca2+] LaCl3 was inhibited by GF109203X in a concentration-dependent manner (IC50: 3.1+1.1 giM).4 Histamine-induced formation of inositol 1,4,5-trisphosphate (Ins(1,4,5)P3) was not changed in the presence of GF109203X.5 The PKC activating phorbol ester, phorbol 12-myristate 13-acetate (PMA, 1 gM), strongly reduced histamine-induced Ins(1,4,5)P3 formation (58+16%). This effect was reversed by GF109203X (5 giM).Furthermore, PMA diminished histamine evoked Ca2" release (50 + 6%) and blocked Ca2+ entry completely.6 The rise in [Ca2+] caused by blocking endoplasmic reticulum Ca2+-ATPase with thapsigargin (1 jiM), was strongly reduced (57 + 3%) after pretreatment of cells with GF109203X. Downregulation of PKC by long-term pretreatment of cells with PMA (1 gM, 48 h) did not abolish this effect of GF109203X (48 + 3% inhibition). 7 In permeabilized DDT, MF-2 cells preloaded with 45Ca2+ in the presence of GF109203X, the amount of 45Ca2+ released by Ins(1,4,5)P3 (10 jiM) was markedly reduced (42+9%). GF109203X did not release Ca2+ itself and did not impair Ins(1,4,5)P3 receptor function.8 Uptake of 45Ca2+ by intact cells, representing Ca2`entry, was enhanced by GF109203X (65 + 11%), by histamine (24+6%) and also by thapsigargin (121+10%). The GF109203X-and the thapsigargininduced uptake of 45Ca2+ were not additive. 9 These data suggest that GF109203X reduces the filling-state of intracellular Ins(1,4,5)P3 sensitive Ca2+ stores by inhibiting the Ca2+ uptake into these stores, thereby promoting store-dependent (capacitive) Ca2+ entry.
AF-induced electrical remodeling in the goat comprises shortening of MAPD and reversal of its physiologic rate adaptation. Changes in the time course of repolarization of the action potential are associated with changes in mRNA expression of the alpha subunit genes of the L-type Ca2+ channel and the Kv1.5 potassium channel.
Goat-milk-based infant formulas (GMFs) are now available in several countries, having been approved by authorities. We systematically evaluated the effects of GMF compared with cow-milk-based formula (CMF) on infant growth and safety parameters. The MEDLINE, EMBASE, and Cochrane Library databases were searched (December 2022) for randomized controlled trials (RCTs). The risk of bias was assessed using the Revised Cochrane Risk-of-Bias tool (ROB-2). Heterogeneity was quantified by I2. Four RCTs involving a total of 670 infants were identified. All trials revealed some concern in ROB-2. Furthermore, all of the included studies were funded by the industry. Compared with infants fed CMF, those fed GMF showed similar growth in sex- and age-adjusted z-scores for weight (mean difference, MD, 0.21 [95% confidence interval, CI, −0.16 to 0.58], I2 = 56%), length (MD 0.02, [95% CI −0.29 to 0.33], I2 = 24%), and head circumference (MD 0.12, 95% [CI −0.19 to 0.43], I2 = 2%). Stool frequency was similar among the groups. Due to differences in the reporting of stool consistency, no firm conclusion can be drawn. Adverse effects (serious or any) were similar in both groups. These findings provide reassurance that GMFs compared with CMFs are safe and well tolerated.
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