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PubMedDate not supplied

Dysfunctional metabolism induced by the systemic effects of burn trauma: the role of rates of polyinositol and glycerophosphate formation in diaphragm.

Common complications among patients with burns are respiratory problems. Inspiration for breathing normally is facilitated by diaphragmatic contractility. However, in burn trauma numerous factors impose on skeletal muscle activity and chest wall function. These present limitations to surgical procedures requiring anesthesia. The hypothesis of this study was that the systemic effects of increasing burn size may result in metabolic changes in the polyinositol part of the phosphatidyl inositol signal transduction system in diaphragm. In this report, rate changes in polyinositol phosphates (i.e., inositol triphosphate (IP3), inositol 1,4 biphosphate (I1,4P2), inositol 1 phosphate (I1P), and inositol) that occurred in diaphragm subjected to the systemic effects of burn trauma were examined. Third-degree burn injury was applied by scalding predefined areas (i.e., 0%, 20%, and 50% body surface area) on the dorsal and ventral surfaces of mice. At postburn day 21 tissues were harvested and the levels of the polyinositol phosphates were measured by incorporation of myo-[2-3H]-inositol with separation of the phosphates by anion-exchange chromatography. All actual levels and rates of formation were analyzed with standard statistical tests and curve-fitting routines. Rate changes of the labelled [3H]-polyinositol phosphates were determined for the control, 20%, and 50% groups. These data show that rate changes occur in the polyinositol part of the phosphatidyl signal transduction system and are caused by the systemic effects of large percent body surface area burns. The changes that occur in the polyinositol phosphates provide insight into dysfunctional processes that can affect skeletal muscle physiology. The long-term goal of these studies is that they will lead to therapeutic advancements in the treatment of respiratory dysfunction in patients with burns.

Animals↗
PubMed1984

The general utility of a glycerophosphate-Tris buffered medium.

An easily prepared medium, originally designed for the cultivation of lactic phages, has been found to have much wider application. Experience in its use over a ten year period with a range of physiologically diverse bacteria, for teaching and research are summarized and evaluated.

Antigens, Bacterial↗
PubMed1999

sn-glycerol-1-phosphate-forming activities in Archaea: separation of archaeal phospholipid biosynthesis and glycerol catabolism by glycerophosphate enantiomers.

In Methanobacterium thermoautotrophicum, sn-glycerol-1-phosphate (G-1-P) dehydrogenase is responsible for the formation of the Archaea-specific backbone of phospholipids, G-1-P, from dihydroxyacetonephosphate (DHAP). The possible G-1-P-forming activities were surveyed in cell-free extracts of six species of Archaea. All the archaeal cell-free homogenates tested revealed the ability to form G-1-P from DHAP. In addition, activities of G-3-P-forming glycerol kinase and G-3-P dehydrogenase were also detected in four heterotrophic archaea, while glycerol kinase activity was not detected in two autotrophic methanogens. These results show that G-1-P is produced from DHAP by G-1-P dehydrogenase in a wide variety of archaea while exogenous glycerol is catabolized via G-3-P.

Dihydroxyacetone Phosphate↗
PubMed1994

Topoisomerase II forms multimers in vitro: effects of metals, beta-glycerophosphate, and phosphorylation of its C-terminal domain.

We present a novel assay for the study of protein-protein interactions involving DNA topoisomerase II. Under various conditions of incubation we observe that topoisomerase II forms complexes at least tetrameric in size, which can be sedimented by centrifugation through glycerol. The multimers are enzymatically active and can be visualized by electron microscopy. Dephosphorylation of topoisomerase II inhibits its multimerization, which can be restored at least partially by rephosphorylation of multiple sites within its 200 C-terminal amino acids by casein kinase II. Truncation of topoisomerase II just upstream of the major phosphoacceptor sites reduces its aggregation, rendering the truncated enzyme insensitive to either kinase treatments or phosphatase treatments. This is consistent with a model in which interactions involving the phosphorylated C-terminal domain of topoisomerase II aid either in chromosome segregation or in chromosome condensation.

Calcium↗
PubMed1995

Sodium glycerophosphate in the treatment of neonatal hypophosphataemia.

Nineteen very low birthweight (mean (SD) gestational age 28 (3) weeks) were parenterally fed nutrition solutions containing inorganic calcium and phosphorus salts. All infants had hypophosphataemia. Plasma concentrations were maintained between 1.5 mmol/l and 2.2 mmol/l. Plasma phosphorus concentrations reached 1.5 mmol/l or greater in three patients after 12 hours, in a further nine patients after 36 hours, and in all patients by 60 hours. Changes in plasma calcium concentrations were not significant.

Calcium↗