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Metabolismo do Eritrócito e hemoglobina, Notas de estudo de Biomedicina

Metabolismo de eritrócito e hemoglobina

Tipologia: Notas de estudo

Antes de 2010

Compartilhado em 09/12/2009

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METABOLISMO
METABOLISMO
DO ERITR
DO ERITRÓ
ÓCITO
CITO
E
E
HEMOGLOBINA
HEMOGLOBINA
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METABOLISMO

METABOLISMO

DO ERITR

DO ERITR””CITOCITO

E

E

HEMOGLOBINA

HEMOGLOBINA

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ERITR”CITO

Disco bicÙncavo

Di‚metro mÈdio: 8 micras

El·stica

AusÍncia de organelas citoplasm·ticas

Citoplasma rico em Hemoglobina, enzimas, Ìons,

·gua e glicose

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COMPOSI

COMPOSI««√O DA√O DA

MEMBRANA

MEMBRANA

ï 50% proteÌnas

ï 40% lipÌdios

ï 10% carboidratos

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MEMBRANA LIP

MEMBRANA LIPÕÕDICADICA

 95% da camada lip

95% da camada lip Ì

Ì dica contÍm:

dica contÍm:

 Colesterol

Colesterol

  Bicamada Lip

Bicamada Lip Ì

Ì dica (fosfol

dica (fosfol Ì

Ì pides)

pides)

  Outros 5%

Outros 5%

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Glicolip Ì

Ì deos

deos

ï

ï Propriedades antigÍnicas da membrana

Propriedades antigÍnicas da membrana

  ¡

¡ cidos Graxos livres

cidos Graxos livres

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MEMBRANA PROTE

MEMBRANA PROTEÕÕNASNAS

Integral

Integral

 Glicoforinas

Glicoforinas A,B,CA,B,C

ï

ï Carregam ant

Carregam ant Ì

Ì genos do GV e garantem sua carga

genos do GV e garantem sua carga

negativa

negativa

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Band 3 3

ï

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Espectrina,, ActinaActina,, AnquiirinaAnquiirina,, BandBand 4.14.

 Contribuem para a forma celular e para a estabilidade

Contribuem para a forma celular e para a estabilidade

da membrana.

da membrana.

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ProduÁ„o anormal de espectrina

produz esferÛcitos e eliptÛcitos.

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CARACTER

CARACTERÕÕSTICASSTICAS

Elasticidade

Elasticidade

  Flexibilidade

Flexibilidade parapara penetrarpenetrar nana microvasculaturamicrovasculatura

 

plasma =

plasma = 

elasticidade

elasticidade

  Acumulo

Acumulo dede cc ·

lcio

lcio nana membranamembrana resultaresulta emem

rigidez

rigidez ee 

da

da elasticidadeelasticidade

Permeabilidade

Permeabilidade

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Perme ·

vel

vel parapara HH

22

O,

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, HCO
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33

 Bomba

Bomba dede CationsCations regula

regula oo balanbalan Á

Á

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o de Nade Na

e K

e K

  Altera

Altera Á

Á„o„o na

na permeabilidadepermeabilidade permitepermite influxoinfluxo dede

Na

Na

e

e provocaprovoca alteraaltera Á

Á„o„o na

na formaforma

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METABOLISMO

METABOLISMO

 AusÍncia

AusÍncia de

de nn ˙

˙ cleo

cleo,, mitoc Ùndrias

mitocÙndrias e

e organelasorganelas

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VIAS METAB

VIAS METAB””LICASLICAS

Shunt

Shunt RapaportRapaport--LueberingLuebering

 

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oxigÍnio

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com

com pelapela HbHb

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VIAS METAB

VIAS METAB””LICASLICAS

  Shunt

Shunt HexoseHexose MonofosfatoMonofosfato --Via dasVia das PentosesPentoses

 5 a 10%

5 a 10% dada glicoseglicose metabolisadametabolisada

  Produz

Produz NADPH +

NADPH + glutationaglutationa reduzidareduzida (GSH)(GSH) protege

protege

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a cc È

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  Principal

Principal FunFun Á

Á„o„o :

: mantermanter aa integridadeintegridade dada HbHb e dase das

prote

prote Ì

Ì

nas

nas dede membranamembrana

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HEMOGLOBINA

HEMOGLOBINA

Fun

Fun

Á

Á„o:„o:

Transporte de

Transporte de

oxigÍnio

oxigÍnio e g

e g ·

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Prote

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na = globina

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Pigmento = Heme

Hb

Hb representa mais de 30 % do peso dorepresenta mais de 30 % do peso do

eritr

eritr

Û

Û

cito.

cito.

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HEMOGLOBINA

HEMOGLOBINA

HEME

HEME

Estrutura

Estrutura

porfir

porfir

Ì

Ì

nica

nica

com um

com um

tomo de

tomo de

ferro no interior (Fe

ferro no interior (Fe

++

++

Sintetizado nas mitocÙndrias dos

Sintetizado nas mitocÙndrias dos

eritroblastos

eritroblastos

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Hb

Hb

ñ

ñ

prote

proteÌÌna globularna globular

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