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A novel granular cell type of locust Malpighian tubules: ultrastructural and immunocytochemical study (1992)

Prado, M. A. ; Montuenga, L. M. ; Villaro, A. C. ; [et al.]

Springer

Cell & tissue research 268 (1992), S. 123-130

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ISSN: 1432-0878

Keywords: Excretory system ; Exocrine cells ; ACTH-like immunoreactivity ; α-MSH-like immunoreactivity ; 7B2-like immunoreactivity ; Locusta migratoria, Schistocerca gregaria (Insecta)

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary A novel secretory cell type in the initial segment of the Malpighian tubules of the locusts Schistocerca gregaria and Locusta migratoria is described ultrastructurally and studied by means of immunocytochemical techniques. The cells show abundant rough endoplasmic reticulum with interspersed Golgi zones. The richness of the cell secretory machinery and the presence of apical dense plemorphic granules suggest a role in secretion of proteinaceous material to the tubule lumen. The surprising finding of ACTH (1–24)-, α-MSH-, and 7B2-like immunoreactivity for this cell is discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00338061

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Innervation of mouse lymph nodes: Nerve endings on muscular vessels and reticular cells (1987)

Villaro, A. C. ; Sesma, M. P. ; Vazquez, J. J.

New York, NY [u.a.] : Wiley-Blackwell

American Journal of Anatomy 179 (1987), S. 175-185

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ISSN: 0002-9106

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Medicine

Notes: Lymph node nerve endings have been studied in 1- to 48-day-old mice. Serial sections of Epon-embedded lymph nodes were observed under the electron microscope to find the nerve endings. Most lymph node nerve fibers finally reach the smooth muscle cells of arterioles and muscular venules. Both kinds of vascular endings are similar, although endings are less numerous on venules. Nerve endings consist of one or more nerve processes surrounded by a usually incomplete Schwann cell sheath; frequently, axons show wide areas directly facing the muscle cells. The distance between such a naked axon and a myocyte ranges from 100 to 800 nm. Small granulated and clear vesicles are especially abundant in varicosities of nerve processes that are located very close to muscle cells. Nerve endings of lymph node vasculature probably correspond to vasomotor sympathetic adrenergic endings, regulating the degree of contraction of vessels which have a muscular layer. Other kinds of nerve endings also exist in lymph nodes: some axons appear free in the stroma and contact the surfaces of reticular cells; the latter also extend delicate cytoplasmic processes that surround the axons. The functional significance of nerve cell-reticular cell contacts is unknown.

Additional Material: 11 Ill.