Proliferin enhances microvilli formation and cell growth of neuroblastoma cells.
Proliferins (also termed mitogen-regulated proteins; MRP/PLFs) belong to the prolactin gene family. Mrp/Plfs are involved in angiogenesis of the uterus and placenta and maximally expressed during midgestation and decline through the remainder of the gestation period in mouse placenta. The tissue expressions of Mrp/Plfs are mainly documented in placenta, hair follicles of skin and in wound healing. In this report, we demonstrate that Plf1, Plf1 minus exon3, Plf2 and Mrp3 but not Mrp4 are expressed in mouse whole brain by diagnostic RT-PCR and Western blotting. The expression levels of Mrp/Plf mRNAs in mouse brains were low during the neonatal period, but higher in embryonic and adult stages, indicating Mrp/Plfs expression profiles are different in mouse brain and placenta. Interestingly, endogenous Mrp/Plfs were detected using immunostaining both in mouse brain sections and the neuroblastoma cell line, Neuro-2a cells. The function of PLF1 was explored by expressing exogenous PLF1 in Neuro-2a cells. This resulted in increased microvilli. Neuro-2a cells with stable expression of PLF1 had increased proliferation compared with normal and stable expressing EGFP cells when cell reached saturation density. Together these data, strongly suggest that MRP/PLFs mediate microvilli formation and contribute to cell proliferation of neuroblastoma cells.
Wang
Jyhi-Wai
JW
Department of Animal Science and Technology, National Taiwan University, Taipei, Taiwan, ROC.
Jiang
Yan-Nian
YN
Huang
Ching-Ying
CY
Huang
Pei-Yu
PY
Huang
Mu-Chiou
MC
Cheng
Winston Teng-Kuei
WT
Shen
Che-Kun James
CK
Ju
Yu-Ten
YT
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000166:cytology / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D005260:Female; D018507:Gene Expression Regulation, Developmental; D006023:Glycoproteins / Q000235:genetics / Q000378:metabolism*; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008871:Microvilli / Q000378:metabolism* / Q000648:ultrastructure; D008969:Molecular Sequence Data; D009447:Neuroblastoma / Q000378:metabolism / Q000648:ultrastructure; D010920:Placenta / Q000378:metabolism; D011247:Pregnancy; D011388:Prolactin; D014018:Tissue Distribution
D006023:Glycoproteins; D036341:Intercellular Signaling Peptides and Proteins; C000634106:Prl2c2 protein, mouse; C477730:Prl2c3 protein, mouse; D011388:Prolactin