TheobservationthatabloodclotspontaneouslydissolveswasfirstdescribedbyDenys
in1889.
Subsequently,thebloodclottingsystemwasshowntobeinvolvedintumor
growth.
Forexample,asearlyas1925,Fisherreportedthataviantissueexplantstrans-
formedtomalignancybyvirusesgeneratedhighlevelsoffibrinolyticactivityundercon-
ditionsinwhichculturesofnormalcellsdidnot. In1958,theconceptthatan
equilibriumexistedbetweenthetendencyofbloodtoclotandtoremainfluidwaspro-
posedbyAstrup.
Atthattime,itwasbelievedthatthishemostaticbalancewasexplained
bytheabilityofpolymerizingfibrintoorchestrateitsownclearancebystimulatingfib-
rinolyticactivity.
Sincethesepioneeringstudies,considerableinformationhasaccumu-
latedthathasdefinedthecomponentsofthecoagulationandfibrinolyticsystemsand
howtheyareinvolvedinphysiologicalandpathophysiologicalprocesses.
Plasminogen: Structure, activation, and
regulationfocusesonthebasicprinciplesandrecentdevelop-
mentsintheplasminogen/plasminresearchfieldandhowtheseresultsprovideacon-
ceptualframeworkforanunderstandingofthephysiologicalroleofplasminogenin
healthanddisease.
Theenzymaticcascadetriggeredbyactivationofplasminogenhasbeenimplicated
inavarietyofnormalandpathologicaleventssuchasfibrinolysis,woundhealing,tis-
sueremodeling,embryogenesis,angiogenesis,andtheinvasionandmetastasisoftumor
cells.
Thisimpressivelistofphysiologicalfunctionsforplasminogenreinforcesthewide
diversityofrolesthatplasminogenplaysinvariousphysiologicalprocesses.
Productive
plasmingenerationrequirestheassemblyofbothplasminogenactivatorsandplasmino-
genonasolidsupportsuchasthefibrinpolymerorthecellsurface.
Theregulationof
plasminproductioninvolvesacomplexinterplaybetweentheseplasminogenactivators,
plasminogenactivatorinhibitors,andplasmininhibitors.
Clearly,theexplosivegrowth
inthisresearchfieldandthemanyexcitingdiscoveriessuggeststhattheresearchefforts
inthenextdecadewillrevealthemechanismsbywhichthecomponentsoftheplas-
minogensysteminteractandregulatebothplasminactivationandfunctionatacellular
level. Plasminogen: Structure, activation, and
regulationisdividedintotwosections.
Thefirstsectiondealswiththestructureandregulationofplasminogen.
Thechapters
inthissectionrangefromdiscussionsofthestructureofplasminogenandtheregulation
oftheplasminogengenetodiscussionsofthestructureandregulationofplasminogen
activatorsandplasminogenactivatorinhibitors.
Alsoexaminedistherelativelynewdata
concerningthegenerationofanti-angiogenicmoleculesfromplasminogen.
Thesecond
sectiondealswiththephysiologicalandpathophysiologicalrolesofplasminogenaswell
astheconsequencesofplasminogengeneknockout.
Discussionsinthissectioninclude
examinationoftheroleofplasminogeninhematopoieticmalignancies,tumorcell
progression,angiogenesis,mammaryglandinvolution,woundhealing,andbone
readsorption. xi xii Preface
Inclosing,Iwouldliketothankmyadministrativeassistant,Ms.
ViSommerfeld,for
herinvaluableassistanceandtimelesseffortswiththeorganizationandeditingofthebook.
Lastly,Iwouldliketoacknowledgetheeffortsoftheauthorsoftheindividualchapters,
whoareauthorities
inthisfield,foragreeingtotaketimefrombusyschedulestoprovide
thesechaptersinatimelyfashion. DavidMortonWaisman Contents Part I.
Plasminogen: Structure and Regulation 1. Human Plasminogen:
Structure, Activation, and Function FrancisJ. Castellino and
Victoria A. Ploplis 1. Introduction 3 2.
StructureofHumanPlasminogen...3 2. 1. PrimaryProteinStructure...3
2. 2. GeneOrganization 5 3. ActivationofHumanPlasminogen...6 3. 1.
ActivationbyPhysiologicalActivators 7 3. 1. 1.
Urokinase-typePlasminogenActivator...7 3. 1. 2.
Tissue-typePlasminogenActivator...8 3. 2.
ActivationbyBacterial-derivedPlasminogenActivators...9 3. 2. 1.
Streptokinase 9 3. 2. 2. Staphylokinase...9 4.
TargetsforPlasminActivity...9 5.
DysplasminogenemiasandPhenotypicManifestations 10 6. Conclusions 11
References...11 2. Plasminogen Activators: Structure and Function
Vincent Ellis 1. Introduction ...19 2. SerineProteases...20 3.
UrokinasePlasminogenActivator,uPA...21 3. 1. SerineProteaseDomain
22 3. 2. N-terminalDomains...24 3. 2. 1. KRModule 24 3. 2. 2.
EGModule 24 4. MechanismsRegulatinguPAFunction...25 4. 1.
ZymogenActivation...25 4. 2. ZymogenActivity...26 4. 3.
ReciprocalZymogenActivation 27 4. 4.
uPARStimulationofPlasminogenActivation...27 4. 4. 1.
uPAandtheTemplateMechanism 28 4. 4. 2.
PlasminogenandtheTemplateMechanism 29 4. 5. AvianuPA,aSpecialCase?
30 xiii xiv Contents 5. TissuePlasminogenActivator,tPA...30 5. 1.
SerineProteaseDomain 31 5. 2. N-terminalDomains ,...33 5. 2. 1.
KRModules ,. . ,. . ,...33 5. 2. 2. F1-EGSupermodule 33 6.
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