SAPKgamma/JNK1 and SAPKalpha/JNK2 mRNA transcripts are expressed in early gestation human placenta and mouse eggs, preimplantation embryos, and trophoblast stem cells.
OBJECTIVE
To test early-gestation human placenta, a human trophoblast cell line, mouse eggs, preimplantation embryos, and a mouse trophoblast cell line for the expression of mRNA transcripts for stress-activated protein kinase/c-Jun N-terminal kinase (SAPKgamma/JNK1, SAPKalpha/JNK2, and SAPKbeta/JNK3).


METHODS
Whole RNA was isolated from the tissue sources listed above and control tissues, and reverse transcription-polymerase chain reaction (RT-PCR) was performed to assay for the qualitative and semiquantitative presence of SAPKgamma/JNK1, SAPKalpha/JNK2, and SAPKbeta/JNK3.


METHODS
None.


METHODS
None.


METHODS
None.


METHODS
The presence and magnitude of amplimer amounts in gels or gene hybridization on Affymetrix cDNA arrays of RT-PCR products of reactions for SAPKgamma/JNK1, SAPKalpha/JNK2, and SAPKbeta/JNK3.


RESULTS
SAPKgamma/JNK1 and SAPKalpha/JNK2 mRNA transcripts are present in early-gestation human placenta, a human trophoblast cell line, mouse eggs, preimplantation embryos, and a mouse trophoblast cell line at levels similar to positive control levels. SAPKalpha/JNK2 is expressed at the highest level of the three transcripts in the family. SAPKbeta/JNK3 is present at levels that are 1/100-1/1,000 those of the positive control and in some cases at the apparent level of the negative control (previously measured by the less-sensitive Northern blot analysis). Analysis with an Affymetrix cDNA array suggested that SAPKalpha/JNK2 and 38 kDa mitogen-activated protein kinase had the highest mRNA expression measured for each of three family members.


CONCLUSIONS
Mitotic placental trophoblast cell lines and primary conceptus/embryo samples containing early placental trophoblasts express SAPKalpha/JNK2 at higher levels than SAPKgamma/JNK1, but not (only low background levels of) SAPKbeta/JNK3 mRNA transcripts. This suggests that SAPKgamma/JNK1 and SAPKalpha/JNK2 may be important mediators of stress-induced responses in early implanting conceptuses that could mediate embryo loss.
Zhong
Wenjing
W
Department of Anatomy and Cell Biology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.
Sun
Tong
T
Wang
Q Tian
QT
Wang
Yingchun
Y
Xie
Yufen
Y
Johnson
Anthony
A
Leach
Richard
R
Puscheck
Elizabeth E
EE
Rappolee
Daniel A
DA
D000818:Animals; D001755:Blastocyst / Q000378:metabolism*; D002478:Cells, Cultured; D004622:Embryo, Mammalian; D005260:Female; D006801:Humans; D051379:Mice; D048055:Mitogen-Activated Protein Kinase 8 / Q000235:genetics / Q000378:metabolism*; D048056:Mitogen-Activated Protein Kinase 9 / Q000235:genetics / Q000378:metabolism*; D020411:Oligonucleotide Array Sequence Analysis; D009994:Osmolar Concentration; D010063:Ovum / Q000378:metabolism*; D010920:Placenta / Q000378:metabolism*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013234:Stem Cells / Q000378:metabolism*; D014327:Trophoblasts / Q000166:cytology / Q000378:metabolism*
D012333:RNA, Messenger; D048056:Mitogen-Activated Protein Kinase 9; D048055:Mitogen-Activated Protein Kinase 8