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- W1494175564 abstract "To determine site and time of initiation of expression of the membrane-spanning mucin ASGP (rMuc4) and the goblet cell-specific, gel-forming mucin rMuc5AC by the developing rat ocular surface epithelium.Newborn Sprague-Dawley rat pups were killed at 1, 7, and 14 days after birth. Adult rats (weight, 200 g) were used as controls. Reverse transcription-polymerase chain reaction (RT-PCR) was performed to detect ASGP mRNA using beta-actin as an internal control. Competitive RT-PCR was performed to quantitate rMuc5AC mRNA using an rMuc5AC-competitive reference standard (CRS) as an internal control. In situ hybridization was performed to localize ASGP and rMuc5AC mRNA. Goblet cells were detected by staining with periodic acid-Schiff (PAS) reagent.ASGP mRNA was detected by RT-PCR at 1 day after birth. Compared with beta-actin, the amount of ASGP mRNA showed a progressive increase from 1 to 14 days of postnatal development. By in situ hybridization, the expression of ASGP was first clearly detected at 14 days after birth at the lid margin, where the most stratification of epithelium was seen, and along the adjacent palpebral conjunctiva. This pattern was seen in rat eyelids that were not yet open but appeared about to open. In rat eyelids already open at 14 days after birth, ASGP mRNA was diffusely spread in the apical cell layer of both conjunctival and corneal epithelia. The expression of rMuc5AC was detected by RT-PCR in ocular surface epithelium in rat pups 1 day after birth. Quantitative RT-PCR showed a low level of rMuc5AC RNA expression in conjunctiva of 1-, 7-, and 14-day-old rats followed by a large increase in expression between 14 days and adulthood. The expression of rMuc5AC was first detected by in situ hybridization in a few goblet cells at 7 days after birth. One or two labeled cells were present in the fornical area; some were on the palpebral side of the fornix; others were present on the bulbar side. The distribution and time of appearance of rMuc5AC correlated with that of PAS staining of goblet cells.The developmental expression of the membrane-spanning mucin ASGP (rMuc4) and the gel-forming mucin rMuc5AC are regionally and temporally separated. Expression of the gel-forming mucin begins at the fornix at 7 days after birth and is correlated with the appearance of goblet cells, whereas, expression of the membrane-spanning mucin begins later at the lid margin at day 14. Expression of the membrane-spanning mucin correlates to eyelid opening." @default.
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- W1494175564 date "1999-08-01" @default.
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- W1494175564 title "Developmental expression of mucin genes ASGP (rMuc4) and rMuc5ac by the rat ocular surface epithelium." @default.
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