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College aantekeningen

Lesnota's gastles IVF embryologie

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Dit document bevat de lesnota's van de gastles IVF van het vak voortplanting en embryologie. Volledig!










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Documentinformatie

Geüpload op
24 juni 2021
Aantal pagina's
6
Geschreven in
2019/2020
Type
College aantekeningen
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Gastles ivf

Onderwerpen

Voorbeeld van de inhoud

Gastcollege IVF: laboratory aspects of in-vitro
Laboratory aspects
In petrischaal: zaadcellen en eicellen voorbereiden, dan samenvoegen en terugplaatsen
- IUI: alleen zaadcellen voorbereiden
- IVF: eicellen ook voorbereid
- ICSI: 1 zaadcel in eicel geïnjecteerd

De zaadcel
1. Zaadcel analyse voor diagnose te stellen
Concentratie bepalen a.d.h.v. telkamer: zaadcellen worden geïmmobiliseerd
- 15 miljoen/ml of minstens dan 39 miljoen per ejaculatie
- Indien minder: oligozospermia

Bewegelijkheid: 4 typen
1. Snel progressief beweeglijk: > 25 μm/s
2. Traag progressief beweeglijk: 5-25 μm/s
3. Niet-progressief beweeglijk: < 5 μm/s, bewegen wel maar gaan niet vooruit
4. Onbeweeglijk: 0 μm/s


Goede staal:
- > 32% progressieve spermacellen of > 40% totale motiele spermacellen
o Indien minder: asthenozo-spermia
- Onbeweeglijk: zijn ze vitaal of niet? Kijken via vitaliteitstest
o Kleurstof toevoegen. Als membraan kapot is gaat zaadcel kleur opnemen
o Als zaadcel kleur niet opneemt leven ze nog, dan kunnen ze nog gebruikt worden
- Categene-syndroom: afwijking staart waardoor tubuli niet schuiven & beweging niet
doorkomt
o = levende zaadcellen maar bewegen niet  ICSI
- Necrozo-spermia: er zijn wel spermacellen maar ze zijn allemaal dood  MESA of TESA


Mature spermatozoa: vorm
- Mooie ovale kop met DNA
- Rond kop: acrosoom met enzymen die nodig zijn om eicel te doorbreken
- In middenstuk zitten de mitochondria, beweging adhv staart
- In humaan: 4% normale vorm = normaal! < 4% = teratozo-spermia
o Kop: te groot, te langwerpig, puntvormig, vastgebonden aan middenstuk, geen of
minder acrosoom. Middenstuk: dubbel, geen mitochondriën. Staart: gekruld, …..
- In teelbal is spermacel al volledig matuur
o Er is vaak nog cytoplasma van de voorlopercel dat vasthangt aan het middenstuk
o Deze wordt verwijdert als de zaadcel in epididymis komt: laatste stap van maturatie

Immunologische afwijkingen van de spermacellen:
- Gevormde zaadcellen zijn goed beschermd in teelbal door bloed-testiculaire barrière
- Immuunsysteem weet niet van deze antigenenproductie
- Bij bv. trauma: bloed-testis barrière beschadigd  bloed in contact met zaadcellen
- Immuunsysteem reageert en lichaam vormt antilichamen tegen eigen zaadcellen
o Sperma-antistoffen kunnen op kop binden: bevruchting benadeeld
o Op middenstuk of staart: beweeglijkheid benadeeld
-  volgens hoeveelheid antistoffen: samenklitten van zaadcellen

, Mar-test: Latex partikels gecoat met EGG en EGA binden op spermacel, hier zitten de antilichamen

Roundcells:
- Cellen tussen zaadcellen, zijn groter dan zaadcel zelf
- Kunnen immature spermacellen zijn, of leukocyten zijn:
- Vaststellen a.d.h.v. kleuringstest met benzidine/phloxine B
o Neutrofielen met peroxidase enzymen kunnen beweeglijkheid zaadcel benadelen
o > 1M roundcells in staal: differentiatie uitvoeren om te zien of het neutrofielen zijn

2. Staal voorbereiden
1. Zoals in vivo seminal plasma verwijderen door te wassen
o Heeft decapaciterende factoren: blokkeren zaadcellen om eicellen te bevruchten
o Zo is spermacel pas klaar tegen dat die de eicel moet bevruchten
2. Beweeglijke spermacellen met goede vorm scheiden van rest (vrij van debris)
 Gradiënt centrifugatie: oplossing met 2 versch concentraties op elkaar  gradiënt
o Daarop semenstaal: bij centrifugeren na 15 min beste deel onderaan
o Selectie op basis van beweeglijkheid én vorm
- Swim-up: semenstaal onder oplosmedium laten staan
o Goed beweeglijke sperma kan opzwemmen naar opl. erboven  die gebruiken
o Minder recuperatie + enkel beweeglijkheid, geen vorm

Criteria:
- Therapie gebaseerd op de staal ná voorbereiding!
o Ookal lage concentraties in totaal, misschien heel veel goede vorm en beweeglijkheid
- IUI: >= 2M progressieve, motiele spermacellen
- IVF: > 0,5M progressieve, motiele spermacellen
- ICSI: >= 1 viabele spermacel

Afwijkingen:
- Oligospermi: < 15M/ml concentratie
- Asthenozospermi: <32% progressief motiel
- Teratozospermi: < 4% normale vorm
- Azoospermi: geen enkele aanwezig in ejaculaat
o Secretoir: probleem in spermatogenese
o Excretoir: blokkade in epididymis of vas deferens

3. Zaadcel verkrijgingstechnieken
- Normaal door masturbatie. Indien hier geen levende spermacellen in zitten:
- MESA:
o Microchirurgical epididymal sperm aspiration
o Vocht wordt direct uit epididymis gezogen (bijna niet meer gebruikt)
- TESE:
o Testicular sperm extraction via testis biopsy
o Incissie in teelbal op 3 niveaus, tubuli die eruit komen eruit knippen
o Tubuli uit elkaar getrokken, gemolken  zaadcellen gebruikt voor micro-manipulatie

4. Sperma DNA fragmentatie test of DNA-breuken test
- Grootste reden van onvruchtbaarheid mens is foute sperma-functie  mislukte fertilisatie
- Dan maar IVF, als dat niet werkt, ICSI = bypass van natuurlijke selectie
- In natuur: bijdrage tot gezond kind: 70-80% van eicel, 10-15% van zaadcel
o Abnormaliteit zaadcel  zaadcel veel grotere invloed op embryo en innesteling
- Fertilisatie dus bereikt in vitro met sperma dat nooit had kunnen gebruikt geweest in vivo

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Lees meer Lees minder
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Recent door jou bekeken

Waarom studenten kiezen voor Stuvia

Gemaakt door medestudenten, geverifieerd door reviews

Kwaliteit die je kunt vertrouwen: geschreven door studenten die slaagden en beoordeeld door anderen die dit document gebruikten.

Niet tevreden? Kies een ander document

Geen zorgen! Je kunt voor hetzelfde geld direct een ander document kiezen dat beter past bij wat je zoekt.

Betaal zoals je wilt, start meteen met leren

Geen abonnement, geen verplichtingen. Betaal zoals je gewend bent via Bancontact, iDeal of creditcard en download je PDF-document meteen.

Student with book image

“Gekocht, gedownload en geslaagd. Zo eenvoudig kan het zijn.”

Alisha Student

Veelgestelde vragen