Comparative Endocrinology of Prolactin by Charles W. Turner (auth.), Horst-Dieter Dellmann, J. Alan

By Charles W. Turner (auth.), Horst-Dieter Dellmann, J. Alan Johnson, David M. Klachko (eds.)

The choice of prolactin because the topic of the Midwest Con­ ference on Endocrinology used to be not just dictated through the new advert­ vances in prolactin learn but in addition through the lengthy culture in that exact sector of Endocrinology within the laboratory of C.W. Turner on the collage of Missouri. accordingly, it kind of feels simply appropri­ ate that those complaints of the 10th Midwest convention on En­ docrinology are devoted to the reminiscence of this scientist, deceased in August 1975 earlier than final touch of this quantity, whose pioneer in­ vestigations have contributed considerably to the development of our wisdom in lots of components of Endocrinology and who performed an important position within the early stages of prolactin learn. This quantity encompasses a evaluate of the early experiences in Turner's laboratory and the most recent effects got by means of a number of the prime learn staff during this region and may be a becoming reminiscence to C.W. Turner. many of the manuscripts revealed the following have been ready after the convention used to be held and contain fabric of more moderen foundation. a lot of the hold up in booklet used to be because of the size of time de­ voted to training of those manuscripts. To the opposite authors and individuals, and to Plenum Press, we show our appreciation for his or her endurance and cooperation. We additionally with to thank Mrs.

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68, 866-869. , and Friesen, H. (1973). The chemistry of growth hormone and the lactogenic hormones. Rec. Prog. Hor. Res. 29, 387-404. J. (1973). Comparison of the tryptic peptides of human, procine and ovine prolactins. Gen. Compo Endocrinol. 21, 358-367. M. (1967). Similarities in the chemical structure of human placental lactogen and pituitary growth hormone. Proc. Natl. Acad. Sci. A. 58, 2307-2314. J. (1974). Modified forms of human growth hormone with increased biological activities. Endocrinology 94, 883-891.

This would explain the ease of deamidation of asparagine 6 in ovine prolactin for residue 7 is glycine. Since glutamine residues lose ammonia very slowly under alkaline conditions, the heterogeneity seen for prolactin is for the most part a result of deamidation of asparagy1 residues. AGGREGATION In addition to the deamidated modifications, aggregated forms are frequently found in preparation of prolactin. The polymers can be detected easily by gel electrophoresis (Cheever and Lewis, 1969). The conditions that promote association of ovine prolactin were studied by Squire, Starman, and Li (1963).

The results, shown in Figs. 12-17, are basically, similar, as far as direction of movement of the secretory product is concerned, to those obtained in the duck pituitary and show that the radioautographic grains are initially diffusely distributed, suggesting their association with the rough ER (Fig. 12). After 20 min. to 1 hr. they are found predominantly over forming (Fig. 13) and aggregating (Figs. ) are concentrated over mature secretory granules (Figs. 16 and 17). Labrie, Pelletier, Lemay, Borgeat, Barden, Dupont, Savary, Cote, and Boucher, 1973) have reported similar radioautographic findings on marnmotrophs from pituitary slices.

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