Summary
The distribution of the tracer substance horseradish peroxidase (HRP, Mw 40,000) in the neuro-intermediate lobe of the lizard, Anolis carolinensis, was studied at various time intervals (13 min to 24 h) after vascular injection. HRP rapidly entered the extracellular lumen of the neural lobe, but did not penetrate into the third ventricle. The tracer was found in micropinocytotic vesicles (MPVs) of ependymal cells within 13 min after injection. The number of cellular inclusions containing HRP increased during the period of observation (24 h). The tracer was sparsely taken up by aminergic and peptidergic nerve terminals of the external layer. After transection of the hypophysial stalk, numerous dense, labelled droplets were found in the peptidergic terminals, and the number of labelled inclusions in ependymal cells increased.
MPVs were frequently found in extensions of stellate cells of the intermediate lobe, and endocytotic vacuoles (EVs) developed especially in the perikaryon. HRP was also found in large cisternae of the secretory cells, appearing predominantly towards the perivascular septum (PVS). These cisternae were found to communicate with the extracellular lumen, probably representing a system of the extracellular space extending into the secretory cell. After transection of the hypophysial stalk, there was an increase in the number of small EVs in secretory cells of the intermediate lobe.
The results are discussed in terms of MSH-release regulation and possible participation of the extracellular lumen, glial and stellate cells in the transport of regulating factors and secretory material.
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References
Bower A, Hadley Mac E, Hruby VJ (1974) Biogenic amines and control of melanophore stimulating hormone release. Science 184:70–72
Brightman MW, Prescott L, Reese ThS (1975) Intercellular junctions of special ependyma. In: Knigge KM, Scott DE, Kobayashi H, Ishii S (eds) Brain-endocrine interaction II. The ventricular system, 2nd Int Symp, Shizuoka 1974, Karger, Basel
Båge G, Ekengren B, Fernholm B, Fridberg G (1974) The pituitary gland of the roach, Leuciscus rutilus. I. The rostral pars distalis and its innervation. Acta Zool (Stockh) 55:25–45
Celis ME, Taleisnik S, Walter R (1971a) Regulation of formation and proposed structure of the factor inhibiting the release of melanocyte-stimulating hormone. Proc Natl Acad Sci USA 68:1428–1433
Celis ME, Taleisnik S, Walter R (1971b) Release of pituitary melanocyte-stimulating hormone by the oxytocin fragment. H-cys-tyr-ile-gln-asn-OH. Biochem Biophys Res Commun Chem Pathol Pharmacol 45:564–569
Cragg B (1979) Overcoming the failure of electronmicroscopy to preserve the brain's extracellular space. Trends Neurosci 2:159–161
Deurs B van (1978a) Horseradish peroxidase uptake into the rat choroid plexus epithelium, with special reference to the lysosomal system. J Ultrastruct Res 62:155–167
Deurs B van (1978b) Microperoxidase uptake into the rat choroid plexus epithelium. J Ultrastruct Res 62:168–180
Deurs B van, Møller M, Amtorp O (1978) Uptake of horseradish peroxidase from CSF into the choroid plexus of the rat, with special reference to transepithelial transport. Cell Tissue Res 187:215–234
Enemar A, Eurenius L (1979) Organization and development of the perivascular space system in the neurohypophysis of the laboratory mouse. Cell Tissue Res 199:99–116
Farquhar MG (1971) Processing of secretory products by cells of the anterior pituitary gland. In: Heller H, Lederis K (eds) Subcellular organization and function in endocrine tissues. Mem Soc Endocrinol University Press, Cambridge 19:79–124
Forbes MS (1972a) Observations on the fine structure of the pars intermedia in the lizard Anolis carolinesis. Gen Comp Endocrinol 18:146–161
Forbes MS (1972b) Fine structure of the stellate cell in the pars distalis of the lizard, Anolis carolinensis. J Morphol 136:227–246
Gordon JH, Bollinger J, Reichlin S (1972) Plasma thyrotropin responses to thyrotropin-releasing hormone after injection into the third ventricle, systemic circulation, median eminence and anterior pituitary. Endocrinology 91:696–701
Güldner F-H, Wolff JR (1973) Neurono-glial synaptoid contacts in the median eminence of the rat: ultrastructure, staining properties and distribution on tanycytes. Brain Res 61:217–234
Harreveld A van (1972) The extracellular space in the vertebrate central nervous system. In: Bourne GH (ed) The structure and function of nervous tissue. Vol IV. Physiology II and Biochemistry II. Academic Press, New York London
Holtzman E (1977) The origin and fate of secretory packages, especially synaptic vesicles. Neuroscience 2:327–355
Howe A, Maxwell DS (1968) Electron microscopy of the pars intermedia of the pituitary gland in the rat. Gen Comp Endocrinol 11:169–185
Karnovsky MJ (1965) A formaldehyde-glutaraldehyde fixative of high osmolarity for use in electron microscopy. J Cell Biol 27:137–138A
Karnovsky MJ (1967) The ultrastructural basis of capillary permeability studied with peroxidase as a tracer. J Cell Biol 35:213–236
Kendall JW, Jacobs JJ, Kramer RM (1972) Studies on the transport of hormones from the cerebrospinal fluid to hypothalamus and pituitary. In: Knigge KM, Scott DE, Weindl A, Rochester NY (eds) Brain-endocrine interaction. Median eminence: Structure and function. Int Symp, Munich 1971, Karger, Basel
Kleinholz LH (1938) Studies in reptilian colour changes II. The pituitary and adrenal glands in the regulation of the melanophores of Anolis carolinensis. J Exp Biol 15:474–491
Knigge KM, Joseph SA (1974) Thyrotrophin releasing factor (TRF) in cerebrospinal fluid of the 3rd ventricle of rat. Acta Endocrinol Copenh 76:209–213
Kobayashi H (1975) Absorption of cerebrospinal fluid by ependymal cells of the median eminence. In: Knigge KM, Scott DE, Kobayashi H, Ishii S (eds) Brain-endocrine interaction II. The ventricular system, 2nd Int Symp, Shizuoka 1974, Karger, Basel, pp 109–122
Kobayashi H, Wada M, Uemura H, Ueck M (1972) Uptake of peroxidase from the third ventricle by ependymal cells of the median eminence. Z Zellforsch 127:545–551
Larsson L, Meurling P (1979) Control of the pars intermedia of the lizard Anolis carolinensis. IV. Transection of the pituitary stalk. Effects on colour change and histology. Cell Tissue Res 204:201–216
Larsson L, Rodríguez EM, Meurling P (1979a) Control of the pars intermedia of the Lizard, Anolis carolinensis. II. Ultrastructure of the intact intermediate lobe. Cell Tissue Res 198:411–426
Larsson L, Rodríguez EM, Meurling P (1979b) Control of the pars intermedia of the lizard, Anolis carolinensis. III. Changes in ultrastructure of the disconnected neuro-intermediate lobe. Cell Tissue Res 199:1–23
Levitin HP (1980) Further evidence that serotonin may be a physiological melanocyte-stimulating hormone-releasing factor in the lizard, Anolis carolinensis. Gen Comp Endocrinol 40:8–14
Libelius R, Josefsson JO, Lundquist I (1979) Endocytosis in chronically denervated mouse skeletal muscle. A biochemical and ultrastructural study with horseradish peroxidase. Neuroscience 4:283–292
Livingston A, Wilks PN (1976) Perivascular regions of the rat neural lobe. Cell Tissue Res 174:273–280
Lundquist I, Josefsson JO (1971) Sensitive method for determination of peroxidase activity in tissue by means of coupled oxidation reaction. Analyt Biochem 41:567–577
Meurling P, Willstedt A (1970) Vascular connections in the pituitary of Anolis carolinensis with special reference to the pars intermedia. Acta Zool 51:211–218
Nair RMG, Kastin AJ, Schally AV (1971) Isolation and structure of hypothalamic MSH release-inhibiting hormone. Biochem Biophys Res Commun 43:1376–1381
Nakai Y, Naito N (1975) Uptake and bidirectional transport of peroxidase injected into the blood and cerebrospinal fluid by ependymal cells of the median eminence. In: Knigge KM, Scott DE, Kobayashi H, Ishii S (eds) Brain-endocrine interaction II. The ventricular system, 2nd Int Symp, Shizuoka 1974, Karger, Basel, pp 94–108
Nishioka RS, Bern HA, Mewaldt LR (1964) Ultrastructural aspects of the neurohypophysis of the White-crowned Sparrow, Zonotrichia leucophrys gambelii, with special reference to the relation of neurosecretory axons to ependyma in the pars nervosa. Gen Comp Endocrinol 4:304–313
Oliver C, Charvet JP, Codaccioni JL, Vague J, Porter JC (1974) T.R.H. in human C.S.F. Lancet, May 873
Pearson AK, Licht P (1974) Embryology and cytodifferentiation of the pituitary gland in the lizard Anolis carolinensis. J Morphol 144:85–118
Pelletier G, Dupont A, Puviani R (1975) Ultrastructural study of the uptake of peroxidase by the rat median eminence. Cell Tissue Res 156:521–532
perryman EK (1974) Fine structure of the secretory activity of the pars intermedia of Rana pipiens. Gen Comp Endocrinol 23:94–110
Perryman EK (1976) Permeability of the amphibian pars intermedia to peroxidase injected intravascularly. Cell Tissue Res 173:401–406
Perryman EK, Bagnara JT (1978) Extravascular transfer within the anuran pars intermedia. Cell Tissue Res 193:297–313
Pilgrim Ch (1978) Transport function of hypothalamic tanycyte ependyma: How good is the evidence? Neuroscience 3:277–283
Porter JC, Kamberi IA, Ondo JG (1972) Role of biogenic amines and cerebrospinal fluid in the neurovascular transmittal of hypophysiotrophic substances. In: Knigge KM, Scott DE, Weindl A, Rochester NY (eds) Brain-endocrine interaction. Median eminence: Structure and function. Int Symp, Munich 1971, Karger, Basel, pp 245–253
Richardson KC, Jarett L, Finke EH (1960) Embedding in epoxy resins for ultrathin sectioning in electron microscopy. Stain Technol 35:313–323
Rodríguez EM (1969) Fixation of the central nervous system by perfusion of the cerebral ventricles with a threefold aldehyde mixture. Brain Res 15:395–412
Rodríguez EM (1976) The cerebrospinal fluid as a pathway in neuroendocrine integration. J Endocrinol 71:407–443
Rodríguez EM, La Pointe J (1969) Histology and ultrastructure of the neural lobe of the lizard, Klauberina riversiana. Z Zellforsch 95:37–57
Rodríguez EM, La Pointe J (1970) Light and electron microscopic study of the pars intermedia of the lizard, Klauberina riversiana. Z Zellforsch 104:1–13
Rodríguez EM, Larsson L, Meurling P (1978) Control of the pars intermedia of the lizard, Anolis carolinensis. I. Ultrastructure of the intact neural lobe. Cell Tissue Res 186:241–258
Scott DE, Knigge KM (1970) Ultrastructural changes in the median eminence of the rat following deafferentation of the basal hypothalamus. Z Zellforsch 105:1–33
Scott DE, Krobish-Dudley G, Knigge KM (1974) The ventricular system in neuroendocrine mechanisms. II. In vivo monoamine transport by ependyma of the median eminence. Cell Tissue Res 154:1–16
Scott DE, Paull WK (1979) The tanycyte of the median eminence I. Synaptoid contacts. Cell Tissue Res 200:329–334
Taraskevich PS, Douglas WW (1979) Stimulant effect of 5-hydroxytryptamine on action potential activity in pars intermedia cells of the lizard Anolis carolinensis: contrasting effects in pars intermedia of rat and rostral pars distalis of fish (Alosa pseudoharengus). Brain Res 178:584–588
Theodosis DT (1979) Endocytosis in glial cells (pituicytes) of the rat neurohypophysis demonstrated by incorporation of horseradish peroxidase. Neuroscience 4:417–425
Thornton VF, Geschwind II (1975) Evidence that serotonin may be a melanocyte stimulating hormone releasing factor in the lizard, Anolis carolinensis. Gen Comp Endocrinol 26:346–353
Törk I (1976) Light and electron microscopic studies on the pars intermedia of the chameleon. Cell Tissue Res 168:223–238
Uemura H, Asai T, Nozaki M, Kobayashi H (1975) Ependymal absorption of luteinizing hormone-releasing hormone injected into the third ventricle of the rat. Cell Tissue Res 160:443–452
Venable JH, Coggeshall R (1965) A simplified lead citrate stain for use in electron microscopy. J Cell Biol 25:407–408
Vigneri R, Filetti S, Pezzino V, Squatrito S, Polosa P, Scapagnini U (1979) Hypothalamus-pituitary connections: The possible role of cerebrospinal fluid in the transmission of the hypophysiotropic signal. In: Neuroendocrinology, Proc Sereno Symp 19:67–76
Voitkevich AA, Dedov II (1972) Ultrastructural study of neurovascular contacts in the median eminence of the rat. Z Zellforsch 124:311–319
Wagner HJ, Pilgrim Ch (1974) Extracellular and transcellular transport of horseradish peroxidase (HRP) through the hypothalamic tanycyte ependyma. Cell Tissue Res 152:477–491
Weatherhead B (1971) Cytology of the neuro-intermediate lobe of the tuatara, Sphenodon punctatus Gray. Z Zellforsch 119:21–42
Weatherhead B (1978) Comparative cytology of the neuro-intermediate lobe of the reptilian pituitary. Zentralbl Veterinärmed C Anat Histol Embryol 7:84–119
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Supported by grants from the Swedish Natural Science Research Council (to Dr. Patrick Meurling) and the Royal Physiographic Society of Lund
The author is indebted to Mrs. Lena Sandell and Miss Inger Norling for excellent technical assistance and photographic aid; and to Dr. Rolf Libelius and Dr. Ingmar Lundquist for generous advice and stimulating discussions concerning the tracer technique
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Larsson, L. Control of the pars intermedia of the lizard, Anolis carolinensis . Cell Tissue Res. 214, 1–22 (1981). https://doi.org/10.1007/BF00235140
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DOI: https://doi.org/10.1007/BF00235140