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PI3Kp55PIK调节亚单位N末端在肿瘤生长及侵袭转移中作用的研究_

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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

11

0kD

catalytic

subunitand

regulatorysubunit,plays

important

roleinvariouscellular

signaling

mechanisms.Activation

ofPI3-kinasehasbeen

implicated

inthe

regulation

ofvariouscellular

activities.including

proliferation,differentiation,migration,apoptosis

and

insulin—stimulated

glucose

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

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.

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

11

0kD

catalytic

subunitand

regulatorysubunit,plays

important

roleinvariouscellular

signaling

mechanisms.Activation

ofPI3-kinasehasbeen

implicated

inthe

regulation

ofvariouscellular

activities.including

proliferation,differentiation,migration,apoptosis

and

insulin—stimulated

glucose

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

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.

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