2024年4月25日发(作者:端俨雅)
Ⅲ协和医科人学,扣嗣医学科学院硕十研究牛学位论文
FunctionalStudies
Regulatory
Subunitof
on
the
N-terminal
ofthe
p55PIK
3-Kinase
in
Tumor
Phosphoinositide
Growthand
Metastasis
Abstract
Phosphoinositide
3-Kinase,which
is
composed
of
a
11
0kD
catalytic
subunitand
a
regulatorysubunit,plays
important
roleinvariouscellular
signaling
mechanisms.Activation
ofPI3-kinasehasbeen
implicated
inthe
regulation
ofvariouscellular
activities.including
proliferation,differentiation,migration,apoptosis
and
insulin—stimulated
glucose
a
transport.
The
deregulation
ofPI3-kinase
activity
hasbeenlinked
to
recent
variety
of
human
tumors.In
years,it
is
widely
reported
thatP13K—Akt
pathway
hasbeeninvolved
in
theincidents
oftumorinvasion
and
metastasis,such
as
tmnorcell
migration
and
adhesion,angiogenesis
poorly
understood.
24一amino—acid
andextracellularmatrix
degradation.But
itsmolecular
mechanisms
P55PIK
is
one
are
ofthe
regulatory
subunitsofP13-Kinase.The
N—terminalendof
p55PIK,which
is
uniqueamong
P13-kinase
regulatory
subunits,was
sufficient
tO
bind
Rb,the
keyregulator
ofcell
cycleprogression.The
interactionbetweenRb
an
and
p55PIKplaysimportant
roleincell
cycleregulation.But
theeffectsofthe
N—terminal
on
24aminoacidsof
p55PIKgrowth
factor
signal
pathway
and
P13一kinasefunction
are
unclear.Severaltumorcelllinesweretransfectedwith
pEGFPCI
and
pEGFPN24
plasmid
by
lipofectin
method.We
observed
ectopic
expression
of
the
N·terminal24
amino
acidsofthe
p55PIK
influence
D1.Itnot
on
cell
cycle,and
founditdecreased
expression
ofcell
cycleproteincyclin
only
inhibited
tumorcell
proliferation
and
colony
formationin
vitro,but
also
alsoreduced
tumorogenicity
oftumorcellsinnude
mice.Wefound
that
p55PIK
involvedin
cell
migration
induced
by
growth
factor
by
using
wound
healingassay
and
cell
migration
assay.Ectopic
expression
ofthe
N—terminal
24
amino
acidsofthe
p55PIK
inhibitedcell
migration
andadhesion.Itincreasedthe
expression
of
celladhesivemoleculeE-cadherinand
inhibited
activity
ofPI-3kinase
bydecreasing
the
expression
of
phospho-Akt.Moreover,we
alsodemonstratedthatthe
expression
ofthe
N-terminal
24
anino
acidsof
p55PIK
influence
2
旧挑和医科大学叶{因医学科学院砸十研究7E学位论文
the
expression
andsecretion
of
tumormetastasis
related
genes
MMP9
gelatinzymography.
anduPA
byusing
In
summary,p55PIKplays
essentialroleincell
cycle
regulmionthrough
its
unique
N-terminal.Ectopicexpression
ofthe
N—terminal
24aminoacidswasinfluence
on
tumorcell
growth,migration
andinvasion.Toelucidate
p55PIK
functionalmechanismsthattake
part
in
the
development
and
progression
oftumors,would
be
beneficial
for
profound
insights
intothe
signal
transduction
that
are
and
human
tumors,and
be
helpful
for
developing
cancer
treatment
drugs
targetedagainst
theP13K—Akt
pathway.The
N24
peptide,derived
fromP1—3kinase
regulatory
subunit
p55PIK,haspotential
clinic
application.
3
2024年4月25日发(作者:端俨雅)
Ⅲ协和医科人学,扣嗣医学科学院硕十研究牛学位论文
FunctionalStudies
Regulatory
Subunitof
on
the
N-terminal
ofthe
p55PIK
3-Kinase
in
Tumor
Phosphoinositide
Growthand
Metastasis
Abstract
Phosphoinositide
3-Kinase,which
is
composed
of
a
11
0kD
catalytic
subunitand
a
regulatorysubunit,plays
important
roleinvariouscellular
signaling
mechanisms.Activation
ofPI3-kinasehasbeen
implicated
inthe
regulation
ofvariouscellular
activities.including
proliferation,differentiation,migration,apoptosis
and
insulin—stimulated
glucose
a
transport.
The
deregulation
ofPI3-kinase
activity
hasbeenlinked
to
recent
variety
of
human
tumors.In
years,it
is
widely
reported
thatP13K—Akt
pathway
hasbeeninvolved
in
theincidents
oftumorinvasion
and
metastasis,such
as
tmnorcell
migration
and
adhesion,angiogenesis
poorly
understood.
24一amino—acid
andextracellularmatrix
degradation.But
itsmolecular
mechanisms
P55PIK
is
one
are
ofthe
regulatory
subunitsofP13-Kinase.The
N—terminalendof
p55PIK,which
is
uniqueamong
P13-kinase
regulatory
subunits,was
sufficient
tO
bind
Rb,the
keyregulator
ofcell
cycleprogression.The
interactionbetweenRb
an
and
p55PIKplaysimportant
roleincell
cycleregulation.But
theeffectsofthe
N—terminal
on
24aminoacidsof
p55PIKgrowth
factor
signal
pathway
and
P13一kinasefunction
are
unclear.Severaltumorcelllinesweretransfectedwith
pEGFPCI
and
pEGFPN24
plasmid
by
lipofectin
method.We
observed
ectopic
expression
of
the
N·terminal24
amino
acidsofthe
p55PIK
influence
D1.Itnot
on
cell
cycle,and
founditdecreased
expression
ofcell
cycleproteincyclin
only
inhibited
tumorcell
proliferation
and
colony
formationin
vitro,but
also
alsoreduced
tumorogenicity
oftumorcellsinnude
mice.Wefound
that
p55PIK
involvedin
cell
migration
induced
by
growth
factor
by
using
wound
healingassay
and
cell
migration
assay.Ectopic
expression
ofthe
N—terminal
24
amino
acidsofthe
p55PIK
inhibitedcell
migration
andadhesion.Itincreasedthe
expression
of
celladhesivemoleculeE-cadherinand
inhibited
activity
ofPI-3kinase
bydecreasing
the
expression
of
phospho-Akt.Moreover,we
alsodemonstratedthatthe
expression
ofthe
N-terminal
24
anino
acidsof
p55PIK
influence
2
旧挑和医科大学叶{因医学科学院砸十研究7E学位论文
the
expression
andsecretion
of
tumormetastasis
related
genes
MMP9
gelatinzymography.
anduPA
byusing
In
summary,p55PIKplays
essentialroleincell
cycle
regulmionthrough
its
unique
N-terminal.Ectopicexpression
ofthe
N—terminal
24aminoacidswasinfluence
on
tumorcell
growth,migration
andinvasion.Toelucidate
p55PIK
functionalmechanismsthattake
part
in
the
development
and
progression
oftumors,would
be
beneficial
for
profound
insights
intothe
signal
transduction
that
are
and
human
tumors,and
be
helpful
for
developing
cancer
treatment
drugs
targetedagainst
theP13K—Akt
pathway.The
N24
peptide,derived
fromP1—3kinase
regulatory
subunit
p55PIK,haspotential
clinic
application.
3