METABOLISM OF PHOSPHOLIPIDS IN PLATELETS IN RESPONSE TO STIMULI N. LIN LEUNG. Submitted tc the School of Graduate Studies
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1 METABOLISM OF PHOSPHOLIPIDS IN PLATELETS IN RESPONSE TO STIMULI By N. LIN LEUNG A Thesis Submitted tc the School of Graduate Studies in partial Fulfillment of the Requirements for the Degree Doctor of Philosophy M~~aster University llovember 1978
2 j '," DOCTOR OF PHILOSOPHY. (1978), (Medical Sciences) M~ASTER UNIVERSITY Hamilton, Ontario TITLE: Metabolism of Phospholipids in Pla~elets Response to Stimuli. in AU1'HOR: N. Lin: Leung" SUPERVISOR: '-!. Proressor l.f. ~ustard ~ER OF PAGES: it
3 AllSTRACT Platelet aggregation plays an important role in both the formation ~ of a hemostatic plug and in the generation of a thrombus. The mechanism of-platelet aggregation has not been fully elucidated. It is conceivable that changes in the synthesis, breakdown or rate of turnover of some of the constituents of the platelet membrane may be important in 'the mechanisms' of aggreiation. - ', Recent experimental evidence. in other mammalian tissaes has implicated the closed circle conversion between MPI and PA as part of the,membrane receptor-effector' interaction process. and a possible role 'permeability toward of tpi-dpi interconversion in the regulation of membrane + + Na and K. Platelets have been recognized to be ~ ust.!ful model for these studies because of its abundance in phosphoinositides anj easiness of obtai~ing pure platelet suspensions. Previous studies showed that addition of ADP to 32P_labeled washed platelets caused an increase in 'radioactivity in PA in 2 sec, DPI in 30 aec and MPI in 2-3 ~n. TPI-DPI 3' interconversion.wds suspected but consistent changes in -P-radioactivity in TPI was not detected. Similar changes were observed in platelets in response to thrombin stimulation. In none of the studies in other tissues all the metabolic pathways for inositol lipids were studied simultaneously. The aims of the present experiments were to investigate TPI-DPI interconversion and MPI metabolism during platelet aggregation and the release reaction caused by ADP, ionophore A23,187 and thrombin. Since these stimuli are considered to act on platelets by different mechanisms. their effects on the platelet phosphoinositide metabolism Were compared., Furthermore, experiments were carried out with unstimulated platelets iii
4 -. labeled with 3lp04 to find out if there vere differences in the patterns of 3lp04 incorporation into the major ~~atelet phospholipids (PC, PE, PS) uncer in vitro and in vivo conditions, as claimed by former investigators. Using improved methods for separation,of phosphoinositides, it vas found that the pattern of 3lp-incorporation into the major phospholipids in platelet suspension,vas similar to that of in vivo platelets vhen the incubstion vas carried out for many hours. Therefore, the phosphate moiety in all phospholipids turn over; but the Phoaphate in the major phospholipids turn over much more slowly than that in the phosphoinoaitides. During ADP-induced platelet aggregation, hydrolysis of TPI to DPI vas measurable at 60'sec, with a loss of P0 4, C-arach1donic acid and 3 H-inositol from TPI. This hydrolysia vas aboliahed by AMP, an inhibitor of ADP-induced aggregation. Resyn~heais of TPI occurred during platelet deaggregation, vith the 32 p04 radioactivity of thia compound being restored to the control level. With A23,187-induced aggregation and release, hydrolysis of TPI did not occur. While there vas a significant amount of MPI converted into PA, the majority of MPI appeared to be hydrolysed to fatty acid and lyso MPI. Using platelets labelled with C-arachidonic acid, H-glycerol, H-inositol, PO 4'and phosphorus assay.. it was found 'that thrombin caused a decrease in TPI (-5.64 i '1.551, P < 0.005) as early as 9 sec when platelet shape change was maximal, 32 P-content was also decreased. Resynthesis of TPI was measurable at 60 sec. Most of the MPI was metabolised via the 1,2-diacylglycerol pathway. The the amount of PA was increased. A small amount of the MPI was converted to polyphosphoinositides or lyso MPI and free fatty acid. iv
5 Theae experiments.have ahown a cloae relationship between changes in phosphoinositide metabolism and platelet aggregation and the release \ reaction. Theae principal changes are: (1) increased TPI- DPI interconversion; (~) increased conversio~ of.mfi. to l,2-diacylglycerol PA and KrI; (3) with the release reaction conversion of-mfi' to 1y60 MIl and free fatty acids. v.'
6 , TABLES OF CONTENTS vi "
7 .' TABLE OF CONTENTS' Page C1lAP'l'ER ONE. INTRODUCTION :. i PART 1. Platelets - General Review Membrane properties of platelets... '::'".~.. Membrane restraints' on laterbl mobility in 4 platelets and.in other' cells (i) Planer association of membrane components - glycoproteins ~ (ii) Protein-lipid membrane domains... 8 (iii) Peripheral membrane restraint. 10 (iv) Membrane-associated (cytoskeletal) restraints 11 ]. Response of platelets to aggregating stimuli ] (i) Platelet response to ADP. 14 (ii) Thrombin and the platelet release reaction (iii) Mechanism of thrombin-induced platelet. aggregation and the release reaction. 21 (iv) Thrombin receptors of platelets. 2] 4. Role of calcium and cyclic nucleotides in platelet fuqction PART II. Phospholipids... ]1 1. Biosynthesis ]] 2. Metabolism of major phospholipids... ]] vii
8 ~, ~ 0.- Page 3. Metabolism of phosphatia1c acid and phosphoin~ ositides,~ Biological significance of.phospholipids... S3 (i) Effect of phospholipid composition 0'\ the (ii) membrane function Effect of phospholipid distribution on, membrane function S4 S7 PART III. Aims "f Study CHAPTER TWO. MATERIALS AND METHODS S A. Materials B. Methods... : Experiment A. In vitro and in vivo incorporation of P-orthophosphate into platelet phospholipids Preparation of platelet suspensions , 2. Animal studies : Lipid extraction Thin layer chromatography Liquid scintillation counting Phoaphorus assay Recovery of. phospholipids ::.. 80 Experiment B. Changes of isotopic labellings in phosphatidic acid and phosphoinositides of rabbit platelets in response to ADP viii
9 ": ' \:,,, Page 1. Preparation of platelet suspension I ncorporati on of 32P04 into!pi of pl~telets I ncorporati on of 32P04 into adenosine triphos- phate of platelets (a). Aggregation studies (b). Inhibition of ADP-induced platelet aggregation by AMP Lipid extraction and thin layer chromatography Liquid scintillation counting \ StatisFical analysis, Experiment C. Comparison of changes in isotopically labelled phosphatidic acid and the phosphoinositides of p\atelet in response to ionophore A23,187 and ADP Preparation of ~latelet suspension and thrombindegranulated platelets Aggregation studies Extraction of phospholipids and analysis.. 89 Experiment D. Early degradation of monophosphoinositide and triphosphoinositide of platelets in response to thrombin stimulation Labelling of phospholipids and analysis. ''''.''UO~O::.'H.HHHH.. H.H..HH
10 Page 3. Extraction and separatianof 1ipids Phosphorus as'!ay C. COllllDents on Methods Extraction of phospholipids from platelets aeparation of phospholipids by thin layer chromatography CHAPTER THREE. EXPERIMENT A.' In'vitro and in vivo incorporation of 32 P-orthophosphate into platelet phospholipids Introduction _ Results Discussion CHAPTER FOUR. EXPERIMENT B , Changes of isotopic labellings of phosphatidic acid and.. phosphoinositides of rabbit platelets in response to AD? Introduction Results Discussion 139 CHAPTER FIVE. EXPERIMENT C x
11 '. Page Comparison of changes ~ isotopically labelled phosphatidic acid and phosphoinositides of platelets in response to ionophore A23,187 and ADP L Introduction Results Discussion ~ " CHAPTER SIX. EXPERIMENT D Early degradation of monophosphoinositide and triphosphoinositide of platelets in response to thrombin stimulation " L' Introduction Results Discussion CHA1'TER SEVEN. GENERAL DISCUSSION I. Turnover of phospholipids in unstimulated platelets 200 L Incorporation of 32 P-orthophosphate Incorporation of Incorporation of II. Phosphatidic acid a~d 3 H-g1yceroL. 14. C-arachidonic acid phosphoinositide metaboli~ in platelets in response to stimuli /., xi '... "",.'
12 Page 1. ADP-induced TPI-DPI interconversion and.. platelet ADP-receptors Thrombin-induced TPI-DPI interconversion and platel~t thrombin-receptors Metabolism of MPI and response of platelets to A23,187 and thrombin Biological significance ~f MPI hydrolysis and TPI-DPI interconversion in platelet shape change and aggregation SUMMARY REFERENCES xii
13 LIST OF TABLES Page I. Comparison of the percentage distribution of phosphorus among five phospholipids in the present study with other published values for platelets II. Amounts of PA, MPI, DPI and '!PI in washed platelets from rabbit ~ III. Incorporation of P-orthophosphate into phospholipids ? IV. 'Effect of second addition of ADP on the -P-content of phosphoinositides and phosphatidic acid V. Inhibitory effect of AMP on ADP-induced changes in 32p_ labelling of phosphoinositides and phosphatidic acid in rabbit platelets VIa. Specific radioactivity of 14C-arachidonic acid in PA and the:phosphoinositides of unsaturated washed rabbit platelets Vlb. Reduction of MPI in platelets in response to A23, VII. Effect of ionophore A23,187 on the 1-14C-arachidonic acid labelling in PA and phosphoinositides in the presence ++ and absence of external Ca V~I.Distribution of radioactivity of 32P C-arachidonic acid, 2-3 H-glycerol and 2-3 H-inositol in platelet phospholipids xiii
14 IX C-arachidonic acid labelling in the major phospholipids and di- and tri-acylglycerol of rabbit Page.' :' platelets stimulated with thrombin.. : X. Changes in the amount of phosphorus of DPI and!"pi nine s~nds following addition of thrombin to the platelet suspension XI. XII. Platelet PA and phosphoinositides in response to thrombin Changes in 1- C-arachidonic acid labelling in platelet XIII. PA,and phosphoinositides in response to thrombin... 3 Changes in 2- H-glycerol labelling in platelet PA and 186 XIV. xv. phosphoinositides in response to thrombin Changes in 2- H-inositol labelling in platelet PA and phosphoinositides in response to thrombin Changes in 3~,- -P-labelling in platelet PA and'phosphoinositides in response to thrombin ;":VI., 3~ % changes of -P0 4 -radioactivity of PA and phosphoinositides of platelets in response to low concentration of thrombin xiv
15 J LIST OF FIGURES (' Page 1. Structures of phospholipids Biosynthesis pathways of phospholipids... : (a). Major metabolic pathways of phospholipids (b). Metabolic pathways of phosphatidic acid and phosphoinositides One dimensional TLC separation of TPI, DPI (a). TVo dimensional TLC separation of phospholipids (b). X-ray film of cwo dimensional TLC separation of phospholipids ; , In vitro incorporation of 32p04 into phospholipids of rabbit platelets... In vitro incorporation of 32 P0 into phospholipids of 4 human plateiets. In vivo incorporation of 3' -P0 into phospholipids of 4 rabbit platelets. Percentage distribution of 32 P0 in rabbit platelet 4 phospholipids in vitro :-. Percentage distribution of 32 P0 in human platelet 4 phospholipids in vitro. Percentage distribution of 32 P0 4 in rabbit platelet 10c phospholipids in vivo \
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