PMID: 9404012Jul 1, 1997

Evidence that free fatty acids in trophocytes of Periplaneta americana fat body may be regulated by the activity of phospholipase A2 and cyclooxygenase

Insect Biochemistry and Molecular Biology
I Ali, J E Steele

Abstract

Previous studies have shown that palmitic, stearic, oleic and linoleic acid levels in trophocytes prepared from the fat body of male Periplaneta americana are increased following treatment of the cells with hypertrehalosemic hormone (HTH). Melittin, an activator of phospholipase A2, mimicked the action of HTH by increasing the free fatty acid content in a concentration-dependent manner. The increase caused by HTH could be eliminated by pretreatment of the trophocytes with 1 mM 4'-bromophenacyl bromide (BPB), an inhibitor of phospholipase A2. BPB also decreases the concentration of free fatty acids in trophocytes not treated with HTH but by a smaller margin. Nordihydroguaiaretic acid (NDGA) and indomethacin, inhibitors of lipoxygenase and cyclooxygenase, respectively, eliminated the increase in free fatty acids evoked by HTH. In the absence of HTH both inhibitors increased the free fatty acid content of the trophocytes, an effect consistent with the known mode of action of these agents. None of the inhibitors tested, all of which blocked HTH activated trehalose synthesis, prevented activation of phosphorylase by HTH. This is taken as evidence that other downstream sites are also important in the regulation of trehalose productio...Continue Reading

References

May 15, 1987·Archives of Biochemistry and Biophysics·R A JurenkaG J Blomquist
Apr 1, 1981·General and Comparative Endocrinology·M PinesL Josefsson
Mar 1, 1994·Comparative Biochemistry and Physiology. Comparative Physiology·J E Steele, R Ireland
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Citations

Dec 1, 1999·Archives of Insect Biochemistry and Physiology·J E Steele, R Ireland
Feb 27, 2001·Insect Biochemistry and Molecular Biology·Hasan TunazDavid Stanley
Feb 27, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·A R Nor AlizaDavid Stanley
Aug 11, 2004·Toxicon : Official Journal of the International Society on Toxinology·E S Garcia, P Azambuja
Jul 11, 2006·Biochimica Et Biophysica Acta·David Stanley
Jan 30, 2002·Archives of Insect Biochemistry and Physiology·Hasan TunazDavid Stanley
Feb 22, 2002·Archives of Insect Biochemistry and Physiology·D Sun, J E Steele
Feb 23, 2019·Frontiers in Physiology·David Stanley, Yonggyun Kim

Related Concepts

4-bromophenacyl bromide
Zinc stearate
Glutamyl-leucyl-threonyl-phenylalanyl-threonyl-prolyl-asparaginyl-tryptophanamide
Neurohormone D, Periplaneta americana
Acetophenones
Enzyme Activation
Enzyme Inhibitors
Fat Body
Saturated Fat
Osmosin

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