PPARγ對胎盤滋養(yǎng)層細(xì)胞氨基酸轉(zhuǎn)運(yùn)體的調(diào)節(jié)及機(jī)制研究
[Abstract]:The placenta in pregnancy is the junction between the mother and the fetus. The normal growth of the fetus in the uterus depends on whether the transplacental nutrient transport can be carried out smoothly. The abnormal transfer function of the placenta often leads to a series of pathological pregnancies, which have great harm to both the mother and the fetus. The function of amino acid transporters in placental cells is essential for fetal growth and development. Many studies have shown that the activity of A, L and TAUT amino acid transporters in the placental tissue of Intrauterine Growth Retardation (IUGR) is significantly reduced, and the amino group of A is amino acid. The relationship between the activity of acid transporter and fetal birth weight has a positive correlation, which suggests that the function of the three line amino acid transporter in the placental cells is closely related to the growth and development of the intrauterine fetus.
PPAR gamma is a subtype of PPARs and belongs to the nuclear receptor superfamily. Many studies have shown that PPAR gamma plays an important role in the development of human placental trophoblast cells and the maintenance of normal pregnancy. The abnormal PPAR gamma function is considered to be closely related to many pathological gestation. Recently, the reports of Marta D AZ and others show PPAR gamma The expression of PPAR gamma receptor in human placental trophoblast cells has a positive correlation with fetal birth weight and placental weight. So, in human placental trophoblast cells, is there a regulation effect on the expression of the subtypes of three series amino acid transporters in human placental trophoblast cells? To clarify this problem, we have done this lesson The study of the problem.
We use the original cultured human placental trophoblast cells as the research object, using the PPAR gamma receptor agonist rosiglitazone and antagonist GW9662 to clarify the expression of PPAR gamma receptor in the regulation of the expression of each subtype of the three line amino acid transporter. Then, this paper uses siRNA interference technique to prove that rosiglitazone regulates the amino acid transport body surface. Whether the process is realized by PPAR gamma receptor and RXR; then, this paper uses the luciferase reporter gene and chromatin immunoprecipitation technique to explore the specific mechanism of PPAR gamma regulation of the expression of three amino acid transporters. Finally, we collected samples of placental tissue from the clinic and detected the placental group of different body weight fetus. The expression of three amino acid transporters and PPAR gamma receptors in the weave, thus the possible relationship between the PPAR gamma receptor and the amino acid transporter in pregnancy and the growth and development of the fetus was discussed from the level of nuclear tissue.
The main experimental results are as follows:
1, PPAR gamma regulates the expression of 3 subtypes of placental amino acid transporters in placenta.
After 48 hours of primary cultured human placental trophoblast, PPAR gamma specific agonist rosiglitazone was used to treat cells. The expression of ATA1, ATA2, ATA4, LAT1, LAT2, TAUT mRNA and protein in cells was detected by realtime-PCR and Western blot. The expression of ATA1, ATA2 and ATA4 was not significantly regulated.
2, the mechanism of PPAR gamma regulating the expression of LAT1, LAT2 and TAUT in placenta
1, PPAR gamma receptor antagonist GW9662 of trophoblast cells, natural ligand 15d-PGJ2 and high selective agonist GW1929 are used to process cells. Results 15d-PGJ2 and GW1929 can up-regulation the expression of LAT1, LAT2, TAUT, and GW9662 can reverse the up-regulation effect of rosiglitazone; using interference technique to knock low PPAR gamma expression can also reverse the up-regulation effect of rosiglitazone. These results suggest that rosiglitazone upregulated LAT1, LAT2 and TAUT expression through PPAR gamma receptor.
2, using interference technique to knock down RXRa expression, rosiglitazone up-regulated LAT1, LAT2, and TAUT expression also reversed, suggesting that rosiglitazone up-regulated LAT1, LAT2, TAUT expression needs RXRa participation.
3, using the protein synthesis inhibitor actinomycone treatment cells, the results showed that rosiglitazone up regulation of LAT1, TAUT process needs to synthesize new proteins, while rosiglitazone up the effect of LAT2mRNA is not affected by CHX.
4, the cells were treated with SP-1 inhibitors and interference techniques. The results showed that SP-1 inhibitor treatment or low SP-1 expression could reverse the up-regulation of rosiglitazone on LAT1, TAUT expression, suggesting that rosiglitazone up-regulated LAT1 through PPAR gamma receptor. The process of TAUT expression requires the participation of SP1.
5, using chromatin immunoprecipitation experiments confirmed that rosiglitazone can promote the binding of SP-1 and LAT1, TAUT gene promoter region, which suggests that rosiglitazone promotes the expression of LAT1 and TAUT by promoting the expression of SP1 and its binding with the promoter region of the gene.
3, small for gestational age, suitable for gestational age, LAT1, LAT2, TAUT and PPAR gamma expression in placenta of large gestational age infants.
In order to verify the difference in the protein expression of LAT1, LAT2, TAUT and PPAR gamma in placenta tissues of fetal age infants at tissue level, we collected less than gestational age infants (15 cases) at random, suitable for gestational age children (15 cases), greater than fetal age (14 cases) placenta tissue, and LAT1, LAT by Western blot method. 2, the expression of TAUT and PPAR gamma, and then the statistical analysis. The results showed that the protein expression of LAT1, LAT2 and PPAR y in SGA group was significantly lower than that of AGA and LGA group, but TAUT was not significantly different. LAT1, LAT2, PPAR gamma expression was positively related to the birth weight of the fetus. The expression of white was positively correlated with the expression of PPAR gamma.
Conclusion:
Rosiglitazone can up regulate the expression of LAT1, LAT2 and TAUT; rosiglitazone up-regulated LAT1, LAT2 and TAUT expression is realized through PPAR gamma, and requires the participation of RXR a; rosiglitazone plays the role of up regulation of LAT1, TAUT expression by promoting SP1 expression and its combination with the promoter region of the gene; rosiglitazone can directly promote the activation of PPAR gamma after activating PPAR gamma. 2 the transcription of genes, the decrease of LAT1, LAT2 and PPAR gamma expression in human placenta may be one of the causes of small for gestational age infants.
【學(xué)位授予單位】:第二軍醫(yī)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:R714
【共引文獻(xiàn)】
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