8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

1/29

ORGANIZAREA STRUCTURALA ACITOPLASMEI CELULEI

EUCARIOTE

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

2/29

Hialoplasma

Se mai numeste substanta fundamentala acitoplasmei, matrice citoplasmica,citosolIn microscopia optica clasica este o masaomogena optic, nestructurataMicroscopia electronica evidentiaza diferentieristructurale specifice,organitele si reteauatridimensionala a citoscheletuluiEste un biocoloid ce contine85%apa,macromolecule organice si ioniSe caracterizeaza prin tranzitia sol-gel si estesediul metabolismului celular

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

3/29

C itoscheletul este constituit din:Microfilamente de actinaMicrotubuli

Filamentele intermediareReteaua de microtrabecule-structuracontroversata

si proteinele asociate.

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

4/29

Tohelp protectyour privacy, PowerPointprevented thisexternalpicturefrom being automatically downloaded.To download and display thispicture,click Optionsin the MessageBar, and then click Enableexternalcontent.

Microtubulii

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

5/29

Caracteristicile microtubulilor

Uniformitatea constitutivaPolaritateaInstabilitatea dinamicaPrezenta de proteine asociate

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

6/29

P olimerizareatubulinelor

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

7/29

Microtubul citoplasmic

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

8/29

F unctiile microtubulilor

Miscarea organitelor sau curentiicitoplasmaticiTransportul axonalMiscarea cililor si flagelilor Fusul de diviziune

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

9/29

Interactiunea tubulina- kinesina

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

10/29

Transportul veziculelor (dineina si kinesina)

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

11/29

S ectiune prin flagel

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

12/29

APARATUL MI TOT IC ES T E C ON S T I TU I T DI N:

POLII FUSULUI DE DIVIZIUNEMICROTUBULII FUSULUI DE DIVIZIUNECINETOCORI

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

13/29

Centrosomul

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

14/29

C entriolul

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

15/29

Tohelp protectyour privacy, PowerPointprevented thisexternalpicturefrom being automatically downloaded.To download and display thispicture,click Optionsin the MessageBar, and then click Enableexternalcontent.

Celula in metafaza

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

16/29

C elula din epiteliu pulmonar in anafaza

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

17/29

Actina la microscop electronic

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

18/29

A ctina si miozina in muschiul striat

structura sarcomerului

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

19/29

Interactiunea miozinei cu filamentul de

actina in procesul contractiei musculare

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

20/29

Muschiul cardiac

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

21/29

Tohelp protectyour privacy, PowerPointprevented thisexternalpicturefrom being automatically downloaded.To download and display thispicture,click Optionsin the MessageBar, and then click Enableexternalcontent.

A ctina si miozina in celula endoteliala

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

22/29

S tructura microvililor

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

23/29

F ilamentele intermediare

Au 5 monomeri constitutivi:Vimentina

DesminaNeurofilamenteleProteina gliala fibrilara acida

CitocheratineleSunt formate din 8 protofilamente,cu caracter apolar

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

24/29

Monomerii filamentelor intermediare

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

25/29

Lamina nucleara formata dinlaminele A,B,C

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

26/29

V imentina-actina F

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

27/29

V imentina-tubuline

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

28/29

K eratina in celule epiteliale

8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote

29/29

K eratina