A Chemical Approach to the Problem of the Organizer

Yamada, Tuneo

doi:10.1016/b978-1-4831-9948-1.50005-x

Cited by 42 publications

(10 citation statements)

References 103 publications

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“…Many studies have addressed the developmental significance of the degradation of YPs in early amphibian embryogenesis [e.g. Flickinger, 1957;Yamada, 1961;Selman and Pawsey, 1965]. However, the developmental significance of the differences in YP degradation activity and of the selective degradation of YPs in different regions is not yet clear.…”

Section: Discussionmentioning

confidence: 99%

Regional Differences in Yolk Platelet Degradation Activity and in Types of Yolk Platelets Degraded during Early Amphibian Embryogenesis

Komazaki¹,

Tanaka²,

Nakamura³

2002

Cells Tissues Organs

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We compared the various regions of amphibian embryos before and during gastrulation to look for differences in activity and character in the degradation of yolk platelets (YPs). Cationic ferritin was used to examine YP degradation activity, the number of cationic-ferritin-containing endosomes and degrading YPs being compared among the various embryonic regions. In addition, we looked for differences in the types of degrading YPs among the various embryonic regions during early development. YP degradation activity was greatest in the animal and dorsal regions, and while large YPs (major axis more than 7 µm) were degraded preferentially in the animal region, small YPs (major axis less than 2 µm) were degraded preferentially in the dorsal region. These results suggest the possibility of different levels of YP degradation activity in different regions of the embryo, and also of regional differences in the types of YPs degraded during amphibian embryogenesis.

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Section: Discussionmentioning

confidence: 99%

Regional Differences in Yolk Platelet Degradation Activity and in Types of Yolk Platelets Degraded during Early Amphibian Embryogenesis

Komazaki¹,

Tanaka²,

Nakamura³

2002

Cells Tissues Organs

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“…10 to 13), a mode for pinocytosis (Gropp 1963). It is based on invagination of the cell membrane which leads to the formation of a tubular channel which migrates in wards (Yamada 1961). Through these pinocytotic channels the protein-rich plasma get entry into the oocytes (Chatterjee 1966).…”

Section: Resultsmentioning

confidence: 99%

Nutrition of the growing oocytes of teleost fishes: Clarias batrachus, Heteropneustes fossilis and Channa punctatus.

Sinha

1985

CYTOLOGIA

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“…These minor components of yolk platelets seem to be released into the cytoplasm of embryonic cells during yolk degradation, and it has been suggested that these molecules may exert an influence over early embryogenesis (Yamada 1961;Follet & Redshaw 1974) Okada and Ichikawa (1947 …”

Section: Yolk Platelets Lipid Droplets and Glycogen Granules Are Stomentioning

confidence: 99%

Degradation of yolk platelets in the early amphibian embryo is regulated by fusion with late endosomes

Komazaki

Hiruma

1999

Dev Growth Differ

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A Chemical Approach to the Problem of the Organizer

Cited by 42 publications

References 103 publications

Regional Differences in Yolk Platelet Degradation Activity and in Types of Yolk Platelets Degraded during Early Amphibian Embryogenesis

Regional Differences in Yolk Platelet Degradation Activity and in Types of Yolk Platelets Degraded during Early Amphibian Embryogenesis

Nutrition of the growing oocytes of teleost fishes: Clarias batrachus, Heteropneustes fossilis and Channa punctatus.

Degradation of yolk platelets in the early amphibian embryo is regulated by fusion with late endosomes

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