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L’INFLUENCE DE L’INSULINE SUR
LES ADIPOCYTES
PELLEN Héloïse
ROLLAND Valentine
TOBY Lola
TRAN Lisa
Adipocyte de rat
avec insuline
Adipocyte de rat
sans insuline
Flux de
glucose
entrant
Flux de
glucose
sortant
1. SCHÉMA DU FLUX DE GLUCOSE EN
FONCTION DE L’INSULINE
2. RÉACTION DE FEHLING POUR DÉTERMINER LA
PRÉSENCE DE GLUCOSE
Milieu en glucose sans
insuline contenant
adipocytes
Milieu en glucose avec
insuline contenant
adipocytes
Présence de
glucose
Absence de
glucose
Ajout de liqueur de Fehling
+ chauffage des tubes
3. ANALYSES DES RÉSULTATS
4. HYPOTHÈSE SUR L’EFFET DE L’INSULINE
Hypothèse 1 : L’insuline
permet au glucose
d’entrer dans les
adipocytes en augmentant
le nombre de perméases
Hypothèse 2 : L’insuline
permet au glucose
d’entrer dans les
adipocytes par un
nombre précis de
perméases
5. VALIDATION DES HYPOTHÈSES
Sachant :
1
𝑓
=
𝐾𝑚
𝐹𝑚
∗
1
𝑔𝑙𝑢𝑐𝑜𝑠𝑒
+
1
𝐹𝑚
y = 0.8366x + 0.0686
y = 0.1021x + 0.0242
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.00 0.10 0.20 0.30 0.40 0.50 0.60
1/flux
entrant
en
Ua
1/Taux de glucose en mM
Linéarisation Linerweaver et Burk
1/fluxsansinsuline 1/fluxavecinsuline Linear (1/fluxsansinsuline) Linear (1/fluxavecinsuline)
On trouve
Km sans insuline = 12,195
mM
Km avec insuline = 4,219
mM
7.
Hypothèse 3 :
L’insuline doit agir sur les
adipocytes en provoquant
l’exocytose de vésicules
contenant les perméases.
8. EXPÉRIENCE 2 : CONFIRMATION DE
L’HYPOTHÈSE 3
En calculant :
Témoins + Insuline
Perméases
associées aux MP 887
(17%)
4499
(84%)
Perméases
associées aux VC
4277
(83%)
849
(16%)
Perméases
totales
5164
(1OO%)
5348
(1OO%)
Nous permet de ne pas
confirmer l’hypothèse 1
td a la con.pptx

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td a la con.pptx

  • 1. L’INFLUENCE DE L’INSULINE SUR LES ADIPOCYTES PELLEN Héloïse ROLLAND Valentine TOBY Lola TRAN Lisa
  • 2. Adipocyte de rat avec insuline Adipocyte de rat sans insuline Flux de glucose entrant Flux de glucose sortant 1. SCHÉMA DU FLUX DE GLUCOSE EN FONCTION DE L’INSULINE
  • 3. 2. RÉACTION DE FEHLING POUR DÉTERMINER LA PRÉSENCE DE GLUCOSE Milieu en glucose sans insuline contenant adipocytes Milieu en glucose avec insuline contenant adipocytes Présence de glucose Absence de glucose Ajout de liqueur de Fehling + chauffage des tubes
  • 4. 3. ANALYSES DES RÉSULTATS
  • 5. 4. HYPOTHÈSE SUR L’EFFET DE L’INSULINE Hypothèse 1 : L’insuline permet au glucose d’entrer dans les adipocytes en augmentant le nombre de perméases Hypothèse 2 : L’insuline permet au glucose d’entrer dans les adipocytes par un nombre précis de perméases
  • 6. 5. VALIDATION DES HYPOTHÈSES Sachant : 1 𝑓 = 𝐾𝑚 𝐹𝑚 ∗ 1 𝑔𝑙𝑢𝑐𝑜𝑠𝑒 + 1 𝐹𝑚 y = 0.8366x + 0.0686 y = 0.1021x + 0.0242 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.00 0.10 0.20 0.30 0.40 0.50 0.60 1/flux entrant en Ua 1/Taux de glucose en mM Linéarisation Linerweaver et Burk 1/fluxsansinsuline 1/fluxavecinsuline Linear (1/fluxsansinsuline) Linear (1/fluxavecinsuline) On trouve Km sans insuline = 12,195 mM Km avec insuline = 4,219 mM
  • 7. 7. Hypothèse 3 : L’insuline doit agir sur les adipocytes en provoquant l’exocytose de vésicules contenant les perméases.
  • 8. 8. EXPÉRIENCE 2 : CONFIRMATION DE L’HYPOTHÈSE 3
  • 9. En calculant : Témoins + Insuline Perméases associées aux MP 887 (17%) 4499 (84%) Perméases associées aux VC 4277 (83%) 849 (16%) Perméases totales 5164 (1OO%) 5348 (1OO%) Nous permet de ne pas confirmer l’hypothèse 1