Studies on secretory activity in the pars intermedia of Xenopus laevis

Cr, Hopkins

doi:10.1016/s0040-8166(70)80008-8

Tissue and Cell

1970

DOI: 10.1016/s0040-8166(70)80008-8

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Studies on secretory activity in the pars intermedia of Xenopus laevis

Hopkins Cr

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1972

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Cited by 9 publications

References 26 publications

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The effects of starvation on the planarian worm Polycelis tenuis iijima

Bowen¹,

Ryder²,

Dark³

1976

Cell Tissue Res.

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Employing a combination of microscopical, biochemical and autoradiographic techniques, the primary effects of starvation on adult polycelis tenuis have been studied. Over a five week period of starvation there is on average a 32% decrease in the size of the organism. This decrease is contributed to by a reduction in mitosis and an increase in cell shrinkage autolysis and death. During starvation (following a sharp rise in RNA synthesis) there is a distinct sequence of events; four peaks of acid phosphatase activity can be resolved. The first is associated with the immediate response of the gastrodermis to feeding; the second (after 6 to 7 days) with increased autophagy and dedifferentiation in the gland cells and with muscle lysis of cells. The third peak (after 14 to 15 days) is contributed to largely by the lysis of cells in the gut and the fourth peak (after 25 to 26 days) is caused by an extensive lysis of the reproductive system. Fine structural changes involving increased intracellular vacuolation, autophagy, crinophagy, atrophy of muscle, increased intercellular space and loss of basement membrane matrix have been related to changes in enzyme pattern. Nerve cells appear unchanged throughout the first five weeks of starvation. Pigment and gland cells loose their characteristic granules, dedifferentiate and become morphologically similar to the undifferentiatied neoblasts. Dedifferentiation and the mechanisms involved in the survival of starvation are discussed.

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The effects of starvation on the planarian worm Polycelis tenuis iijima

Bowen¹,

Ryder²,

Dark³

1976

Cell Tissue Res.

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Ultrastructural studies on prolactin and growth hormone cells in Anguilla pituitaries in vitro

Benjamin

Baker

1976

Cell Tissue Res.

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Eel hemi-pituitaries were cultured in vitro on high or low sodium media which are known to affect differentially prolactin and growth hormone release. Ultrastructural examination of the prolactin cells after 24 h culture showed the Golgi bodies were markedly more abundant and widely distributed in hemi-pituitaries from the low sodium medium. Secretory granule release profiles and dense bodies were also more frequent, but the percentage of the cytoplasmic volume occupied by secretory granules was lower than on the high sodium medium. RER was only slightly modified. Significant differences were noted in the shape and processes of the non-granulated (stellate) cells of the RPD, but there were only slight differences in the the ultrastructure of the somatotropes.

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Ultrastructure of the anuran pars intermedia following severance of hypothalamic connection

Castel

1972

Z.Zellforsch

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Studies on secretory activity in the pars intermedia of Xenopus laevis

Cited by 9 publications

References 26 publications

The effects of starvation on the planarian worm Polycelis tenuis iijima

The effects of starvation on the planarian worm Polycelis tenuis iijima

Ultrastructural studies on prolactin and growth hormone cells in Anguilla pituitaries in vitro

Ultrastructure of the anuran pars intermedia following severance of hypothalamic connection

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