A ventrally localized inhibitor of melanization in Xenopus laevis skin

Toshihiko Fukuzawa, Hiroyuki Ide

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Melanophores normally differentiate in dorsal but not in ventral skin of Xenopus laevis. We have sought factors which might regulate this differentiation pattern, and we have obtained a putative melanization inhibiting factor (MIF) from ventral but not from dorsal skin. Preliminary studies reveal that MIF is destroyed by heat or trypsin treatment, indicating its protein composition, and has a molecular weight in the range of 300 kDa. The effects of MIF on the differentiation of neural crest derivatives to melanophores were examined in vitro in the presence of tyrosine and fetal calf serum (FCS). Tyrosine enhances melanophore differentiation in vitro at concentrations equivalent to those estimated in adult Xenopus blood plasma (20 μM). FCS also stimulates melanization, by way of materials other than the tyrosine contained in FCS. MIF strongly inhibits outgrowth and melanization of neural crest cells from neural tube explants. MIF also inhibits the differentiation of melanoblasts contained in cultured explants of ventral skin. Inhibition of melanization or melanophore differentiation by MIF occurs even in the presence of l-tyrosine and/or FCS. We suggest that MIF plays an important role in the establishment of dorso-ventral pigment patterns in amphibia.

Original languageEnglish
Pages (from-to)25-36
Number of pages12
JournalDevelopmental Biology
Volume129
Issue number1
DOIs
Publication statusPublished - 1988
Externally publishedYes

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Melanophores
Xenopus laevis
Tyrosine
Skin
Neural Crest
Serum
Neural Tube
Amphibians
Xenopus
Trypsin
Hot Temperature
Molecular Weight
Proteins

ASJC Scopus subject areas

  • Developmental Biology

Cite this

A ventrally localized inhibitor of melanization in Xenopus laevis skin. / Fukuzawa, Toshihiko; Ide, Hiroyuki.

In: Developmental Biology, Vol. 129, No. 1, 1988, p. 25-36.

Research output: Contribution to journalArticle

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