Abstract
Working on catecholamine systems for years, the neuropharmacologist Arvid Carlsson has made a number of important and pioneering discoveries, which have highlighted the key role of these neuronal and peripheral neurotransmitters in brain functions and adrenal regulations. Since then, major advances have been made concerning the distribution of the catecholaminergic systems in particular by studying their rate-limiting enzyme, tyrosine hydroxylase (TH). Recently new methods of tissue transparency coupled with in toto immununostaining and three-dimensional (3D) imaging technologies allow to precisely map TH immunoreactive pathways in the mouse brain and adrenal glands. High magnification images and movies obtained with combined technologies (iDISCO+ and light-sheet microscopy) are presented in this review dedicated to the pioneer work of Arvid Carlsson and his collaborators.
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Introduction
Advances and ideas in science often emerge from methodological developments capable of breaking a technological lock. In the 1950–1970’s, one of these locks in neuroscience was the distribution and the visualization of neurotransmitter substances which were recently discovered. Thus, extensive studies by the Swedish school of neuroanatomy provided a fantastic evolution and sensitivity improvement of the histofluorescence methods developed by Falck and Hillarp (Falck and Torp 1962; Falck et al. 1982). It made possible for the first time to visualize the distribution of noradrenaline (NA) (Vogt 1954), dopamine (DA) (Carlsson et al. 1958) and the catecholamine neurons and pathways in the rodent brain (Carlsson 1959; Carlsson et al. 1962; Dahlström and Fuxe 1964). It resulted in a series of discoveries on anatomical, pharmacological and mechanistic aspects of monoaminergic systems not only in the central nervous system but also in the diffuse neuroendocrine system (Sladek and Björklund 1982). It similarly allowed to anatomically demonstrate the colocalization of several transmitters (aminoacids, amines and later neuropeptides) in the same neuron (Hökfelt et al. 1986; Seroogy et al. 1988).
Carlsson with Falck and Hillarp (Carlsson et al. 1958) brought the first demonstration of DA production in the brain and provided evidence that the DA distribution was not similar to that of NA or adrenaline, suggesting different roles for these three catecholamines (Carlsson et al. 1961). Thereafter, Dahlström and Fuxe (1964) published a detailed distribution of catecholaminergic containing neurons in the rat brain. Few years later, Nobin and Björklund (1973) reported the presence of such monoamineric neurons in the fetus human brain.
By means of the same histofluorescent methods and more sensitive tracing techniques, it was shown that the DA innervation of the basal ganglia (or striatum) arose from the substantia nigra in the mesencephalon (Anden et al. 1964; Bertler et al. 1964). When later specific antibodies were raised against various neurotransmitters and enzymes involved in the synthesis of these catecholamines such as tyrosine hydroxylase (TH), which existence was first postulated by Blaschko (1939) and isolated by Nagatsu et al. (1964), it was possible, with single and dual immunohistochemical methods, to produce complete maps for monoaminergic systems, confirming and extending various hypotheses on the key roles of such neurotransmitter molecules in the central and peripheral nervous systems (Hökfelt et al. 1976, 1977; Carlsson 2001).
It was demonstrated that the basal ganglia are the major source of DA (Bertler and Rosengren 1966) and led Carlsson to propose that nigrostriatal DA might be involved in the control of motor activity while its decrease could be the cause of the extrapyramidal symptoms in patients with Parkinson’s disease (Carlsson 1959). Such hypothesis was then supported by the observation of a decrease in DA concentrations in preclinical models of Parkinson disease (Sotelo et al. 1973) and in the basal ganglia in patients with Parkinson’s disease. Finally, l-DOPA treatments, by restoring dopamine transmission, had beneficial effects (Birkmayer and Hornykiewicz 1961; Barbeau 1969; Carlsson 1971).
In 1955, coming back from Dr. Brodie’s laboratory at the NIH, A. Carlsson joined Hillarp’s laboratory in Lund where research was dedicated at that time to adrenal glands. Pioneer papers published by Carlsson, Hillarp and coworkers focused on these peripheral endocrine glands. They revealed high amounts of catecholamines in the adrenal medulla in specific granules also containing adenosine triphosphate (Hillarp and Nilson 1954; Carlsson and Hillarp 1956; Carlsson et al. 1957). Thereafter, Carlsson mainly dedicated his studies to the brain, bringing anatomical, biochemical, pharmacological and behavioral evidence for the implication of the different catecholaminergic systems in psychiatric and neurodegenerative disorders (Carlsson 1993, 2001; Tamminga and Carlsson 2002).
TH, the rate-limiting enzyme in catecholamine biosynthesis, has been widely used to study the catecholaminergic systems in particular the DA systems. Since the masterpiece work carried out by Hökfelt and coworkers on the distribution of TH-immunoreactive neurons in the rat brain (Hökfelt et al. 1984), computer science and imaging technologies dramatically improved both the quality and the resolution of images but also the quantitation of catecholaminergic neurons in the central structures and peripheral tissues.
Among such advances, the recently developed clearing methods coupled with light-sheet microscopy allowed to visualize immunolabeled cells in whole 3D organs. Thus, image segmentation procedures and 3D reconstruction at high resolution permit to identify new maps of TH immunoreactive cell bodies as well as TH nerve fiber pathways. The present review extends on mouse brain previous anatomical studies in the rat reported by the Swedish school using TH immunocytochemistry, by means of the iDISCO methodology in a transparent postnatal mouse brain as well as adult adrenals. Such approach enables to obtain a precise 3D distribution of catecholaminergic neuronal cell bodies, nerve pathways and neuroendocrine adrenal cells, that has never been described before.
Methodological considerations
Until recently, immunohistochemical approaches relied on thin tissue sectioning, sometimes followed by serial tissue section reconstitution which yielded incomplete spatial distributions (Simmons and Swanson 2008). New technologies such as light scanning microscopy or two-photon imaging have improved the detection and the imaging of fluorescent immunostaining on thick sections. However, such approaches are still limited by the sample size and by light scattering through thick tissues (Dobosz et al. 2014).
New methods of “clearing samples” recently emerged to avoid in particular light scattering (Richardson and Lichtman 2015). Together with ultramicroscopy, these techniques allow to obtain 3D imaging (Dodt et al. 2007; Erturk et al. 2012). Several chemical improvements of the clearing approaches and the development of various protocols (Belle et al. 2014, 2017; Renier et al. 2014, 2016; Launay et al. 2015; Pan et al. 2016; Klingberg et al. 2017) have been used to carried out this technique on various tissues in different species including human.
Immunohistochemical procedure
All animal procedures were performed in agreement with Institutional guidelines for the care and use of experimental animals (EU Directive 2010/63/UE). Five days-old C57BL/6 (P5) mice were used for the TH immunohistochemical localization in the brain and 14 days-old (P14) and adult mice for the adrenal glands. Mice (Janvier Ltd, Le Genest-Saint Isle, France) were anaesthetized with a mixture of Ketamine (80 mg/kg body weight) and xylazine (8 mg/kg bodyweight, Virbac, France) injected intraperitoneally. Tissues were fixed with an intracardiac perfusion of 4% paraformaldehyde in phosphate buffer saline (0.1 M PBS). Samples were carefully dissected, post-fixed overnight at 4 °C in the same fixative and assigned for TH immunostaining. Tissues were washed in 0.1 M PBS for 1 h twice, then in 50% methanol (in H2O) for 90 min, 80% methanol for 90 min, 100% methanol for 90 min. Tissues were then bleached with 3% H2O2 in 100% methanol overnight at 4 °C in the dark without shaking. Brains and adrenal glands were rehydrated in 100% methanol, 80% methanol, 50% methanol, and 0.1 M PBS, each step for 90 min before in toto staining procedures.
To illustrate the use of the immunohistological approaches in combination with clearing technique, two different immunostaining protocols for TH have been used for postnatal P5 mouse brains and for postnatal P14 and adult mice adrenal glands, respectively.
Pretreated P5 brains were incubated with the blocking and permeabilization PBSG-T solution (0.1 M PBS, 0.2% gelatin, 0.5% Triton-X100, 0.1 g/L thimerosal) for 2 days at 37 °C under agitation. Brains were then incubated with a previously characterized rabbit anti-TH antibody (Millipore, Guyancourt, France, #AB152, dilution 1:300) diluted in PBSG-T containing 0.1% saponin for 7 days at 37 °C with gentle shaking. This primary anti-TH antibody has been previously validated for iDISCO treatment (see the website https://idisco.info/validated-antibodies/which provides the list of antibodies compatible with iDISCO protocols). Brains were then washed in 0.1 M PBS for 1 day and incubated with a secondary antibody (donkey anti-rabbit Cy3, Jackson ImmunoResearch, Newmarket, UK, #705-165-147, 1:500) and TO-PRO 3 iodide to label neuronal cells (Invitrogen, Villebon, France, 1:80) in PBSG-T containing 0.1% saponin for 2 days at 37 °C in a dark room with gentle shaking.
Concerning postnatal P14 and the adult adrenal glands, samples were dehydrated (MeOH 20%, 40%, 60% 80% 100% twice, 1 h each at room temperature), bleached (MeOH 100%/3% H2O2, overnight at 4 °C) and rehydrated (MeOH 80%, 60%, 40%, 20%, 0.1 M PBS 1 h each at room temperature). Tissues were incubated for permeabilization in 0.1 M PBS/0.2% Triton/20% DMSO/23 µg l−1 glycine for 2 days at 37 °C with gentle shaking and for blocking in 0.1 M PBS/0.2% Triton/6% donkey serum/10% DMSO for 2 extra days at 37 °C. Tissues were then incubated with the same primary and secondary antibodies as described above for P5 brains (rabbit TH, Millipore, Guyancourt, France, #AB152, dilution 1:300) in 0.1 M PBS/0.2% Tween 20/0.1 µg ml−1 heparin/5% DMSO/3% donkey serum for 7 days with shaking at 37 °C and with a secondary antibody donkey anti-rabbit Cy3, Jackson ImmunoResearch, Newmarket, UK (#705-165-147, 1:500) in 0.1 M PBS/0.2% donkey serum/3% DMSO for 7 days. Finally, samples were washed in PBS for 36 h before the clearing procedure.
iDISCO+ clearing procedure
P5 mouse brains and P14/adult mouse adrenals were cleared using iDISCO+ protocol (Renier et al. 2016). Briefly, samples were dehydrated in 20%, 40%, 60%, 80% methanol in H2O 1 h each step and 100% methanol for 1 h twice. They were incubated overnight in 1 volume of 100% methanol/2 volumes 100% dichloromethane (DCM) anhydrous (#270997, Sigma-Aldrich, St Quentin-Fallavier, France), and washed twice for 20 min in 100% DCM. Finally, tissues were incubated in 100% dibenzyl ether (DBE) (#108014, Sigma-Aldrich) for at least 3 h before imaging.
Light-sheet imaging
Tissues were imaged with an Ultramicroscope II (LaVision BioTec, Bielefeld, Germany) using the ImspectorPro software (LaVision BioTec). The light sheet was generated by a laser (wavelength 561 nm or 640 nm, Coherent Sapphire Laser, LaVision BioTec) and two cylindrical lenses (Launay et al. 2015; Godefroy et al. 2017). A binocular stereomicroscope (MXV10, Olympus) with a 2× objective (MVPLAPO, Olympus) was used at different magnifications 0.63× for brain and P14 kidneys with adrenals and 3.2× for adult adrenals. Tissues were placed in an imaging reservoir made of 100% quartz (LaVision BioTec) filled with DBE and illuminated from the side by the laser light. Images were acquired with a PCO Edge SCMOS CCD Camera (2560 × 2160 Pixel size, LaVision BioTec). The step size in Z-orientation between each image was fixed at 2 µm resolution for 1.26× magnification and 1 µm for 6.4× magnifications, respectively.
Image processing
2D Images of the brain and adrenal glands were constructed from a Z-series of Ultramicroscope fluorescence images using the Imaris software, version 8.3.0_64 (http://bitplane.com, Zürich, Switzerland). Option tools of the software were used for 3D rendering or segmentation. Three steps were used for this process (Fig. 1): the first step consists in the determination of 2D images from regions of interest (ROI) according, for the brain, to the mouse brain atlas of Franklin and Paxinos (1997) and validation on 3D rendering. The second step aims to create a surface around ROI and in the third step concerning brain structures, false colors were given for brain structures of interest. 3D images and tiff series were obtained using the “animation” tools of the software. Movies were generated using the free software Fiji.
Results
3D localization of TH immunoreactivity in postnatal P5 mouse brain with the iDISCO+ technique
We recently used the iDISCO+ clearing procedure to identify, by means of TH immunostaining, the various catecholaminergic structures and pathways in a whole P5 postnatal mouse brain (Godefroy et al. 2017). This review summarizes the main results obtained in this study.
We took the opportunity of the TH staining to delineate and follow in 3D the original nomenclature A1–A16 of the various catecholamine-containing cell groups that was previously described by several groups (Dahlström and Fuxe 1964; Hökfelt et al. 1984; Lindvall et al. 1984). After two weeks of whole mount labeling procedure with a highly specific anti-TH antibody combined with image processing, a strong TH immunoreactivity corresponding to the various catecholaminergic cell groups was detected in a rostro-caudal localization with different orientations (sagittal, frontal, longitudinal) (Fig. 2). As expected, a strong TH staining corresponding to DA innervation was detected in the striatum, anterior cortical areas and in the olfactory bulbs. In the mesencephalon, a clear distinction was delineated between the well-known A10 DA neurons in the ventral tegmental area (VTA) corresponding to the ventromedial DA pathways projecting rostral to the nucleus accumbens and the frontal cortex, and the nigrostriatal pathway of the A9 DA neurons. Finally, caudal to the A9 dopamine neurons, some cells (A8) dorsal to the medial lemniscus were also detected.
In addition, a strong TH immunostaining was observed in the hypothalamus corresponding to the tuberoinfundibular DA neuronal network in the mediobasal hypothalamus, the arcuate nucleus and the median eminence (Fig. 2c) but also to more rostrally located DA cell groups (A11–A15) (Fig. 2c) as previously described by Anden et al. (1965).
Concerning the catecholaminergic neurons located in the pons and in the medulla oblongata, the A1–A6 groups of noradrenergic cell bodies were identified (Fig. 2). More caudally, the two groups of noradrenergic (A cells)/adrenergic (C cells) were found in the nucleus of the solitary tract (A2/C2) and in the medulla oblongata/facial nucleus (A1/C1).
A 3D movie allows to visualize the various catecholaminergic neurons of the mouse P5 brain as well as the ascending and descending catecholaminergic pathways innervating the various parts of the brain obtained with this iDISCO+ technique. It shows for instance on the same brain in 3D imaging the different TH immunoreactive projections from the brainstem to the mesencephalic and the hypothalamic regions via the medial forebrain bundle and the precise localization of the known innervation of the striatum by both nigrostriatal and mesolimbic pathways (Movie 1).
3D TH immunocytochemical localization in postnatal P14 and adult mouse adrenal glands with the iDISCO+ technique
By means of the same experimental approach with slight modifications as described in the methods, a strong TH immunostaining was detected in the developing P14 and in the adult adrenal glands located above the kidneys (Fig. 3). As expected, TH immunoreactivity was found in the chromaffin catecholaminergic cells in the adrenal medulla (Movie 2). 3D images also show the orthosympathic nerves which innervate the adrenal gland. A high TH immunoreactivity was localized in the developing P14 adrenals on the apical side of the kidney, within the inner part of the gland but also in populations of cells scattered in the cortex which will reach the medulla later during postnatal development as previously described (Gallo-Payet et al. 1987; Bornstein et al. 1994) (Fig. 3 and Movie 2).
The physiological catecholaminergic secretory activity of the chromaffin cells is influenced by a wide-range of endocrine (angiotensin II, insulin) (Cavadas et al. 2003; Senthilkumaran et al. 2016) and paracrine (Ehrhart-Bornstein and Bornstein 2008) factors. More recently, a link with the immune system activation has been demonstrated since several cytokines and chemokines can target chromaffin cells (Ait-Ali et al. 2008; Rosmaninho-Salgado et al. 2009; Bunn et al. 2012). The very high concentration of TH in specific granules of the adrenal medulla previously allowed the purification of the enzyme (Markey et al. 1980) and an impressive list of publications related to catecholamine secretion mechanisms, intracellular signaling pathways and regulation of adrenaline and noradrenaline release by various substances which play a major role in physiological adaptation to stress has emerged (Kvetnansky et al. 1970; Waymire et al. 1972; Ehrhart-Bornstein and Bornstein 2008).
Discussion and conclusions
Despite a few limits, the methodology using light-sheet microscopy, as described here, provides a high-resolution 3D imaging of intact tissues. The main drawbacks of the method are related to the penetration of the antibodies or of fluorescent molecules into the cleared tissue. Depending on the composition of the tissue (presence of lipids, myelin, membranes, connective tissues), some well-characterized antibodies used in previous classical immunocytochemical studies may not be able to penetrate the tissue sample. For these reasons, specific protocols have to be tested for each molecule/antibody used (Azaripour et al. 2016; Zhu et al. 2017). The size of the tissue may be also a critical point to obtain high-resolution images. However, iDISCO+ can be used for immunocytochemistry and retrograde transport staining (Launay et al. 2015). Furthermore, Kramer et al. (2018) recently provided the evidence that iDISCO+ enables to visualize mRNAs in cell nuclei of the mouse brain.
Segmentation of the images with false colors may be used to map, distinguish and identify the different catecholaminergic systems present in/or innervating various brain areas and peripheral tissues.
By means of other specific antibodies against catecholamine biosynthesis enzymes or catecholamine antibodies—yet unpublished experiments—it may be possible to independently obtain a precise 3D brain mapping of the DA, NA and adrenaline innervations. This review only focused on the central and peripheral TH immunoreactivity. Further studies using similar combined approaches could be conducted to evaluate the distribution of TH by double labeling with selective enzymes for noradrenaline and adrenaline neurons in healthy and pathological conditions. Under such conditions, the iDISCO+ approach may further provide quantitative information on the number of cells, branching, volume and distances (Soderblom et al. 2015; Pan et al. 2016; Godefroy et al. 2017; Renier et al. 2016; Belle et al. 2017). The robustness of the technique is demonstrated in the present work when comparing the results obtained with the reference works related to the various types of catecholaminergic cell groups (Hökfelt et al. 1984; Balan et al. 2000; Ugrumov et al. 2002; Björklund and Dunnett 2007; Epp et al. 2015; Yeo et al. 2016). Though not analyzed in detail here, 3D determination of cell bodies and tract-tracing may reveal some novel organization of subtle catecholaminergic pathways as already observed in previous classical histochemical methods (Björklund and Dunnett 2007). It may also highlight some differences between species since iDISCO+ has been largely used until now in mice and in human tissues (Belle et al. 2017; Vigouroux et al. 2017; Moore et al. 2018). Concerning the peripheral organs such as the adrenal glands, the iDISCO+ approach can provide an estimation of the volume and number of chromaffin cells expressing TH in various experimental conditions such as stress as previously carried out in the hypothalamus with vasopressin neurons (Godefroy et al. 2017). Finally, the present data also illustrate the possibility to address questions related to the developmental aspects of various organs.
As reported in the introduction, novel technologies may open new ideas and research orientations. The clearing methods may be used to bring new information on the distribution, the development pattern of known or yet undiscovered transmitter substances in the brain and peripheral organs in various animal species and human. iDISCO+ whole-brain imaging of non-sectioned tissues may help to follow the establishment of short and long neuronal projections during development or after injury, analyze the fate of stem cells and stem cell therapies (Qi et al. 2017). Such imaging approach can become a routine microscopic procedure combining high-resolution ultramicroscopic imaging on transparent tissues with computer 3D reconstitution. As it was the case with the development of confocal microscopy, such methodologies will become an essential tool to address new questions in anatomy and cell biology such as neuronal circuitry, migration and developmental processes.
Change history
17 November 2018
Unfortunately, the given name and family name of the fourth author was incorrectly tagged in the xml data, therefore it is abbreviated wrongly as ‘‘Goazigo AR’’ in Pubmed. The correct given name is Annabelle and family name is Reaux‑Le Goazigo.
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Acknowledgements
The present study was supported by Sorbonne and Normandie Universities, the Institut National de la Santé et de la Recherche Médicale (INSERM) and the Association Française d’Epargne et de Retraite (AFER). Images were obtained on PRIMACEN (http://www.primacen.fr), the Cell Imaging Platform of Normandy, IRIB, Faculty of Sciences, University of Rouen, 76821 Mont-Saint-Aignan.
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Supplementary material 1 Movie 1 3D movie of TH distribution in P5 mouse brain. Attribution of false colors and volume “rendering” for dopaminergic (blue, in the striatum and mesencephalic regions), various catecholamines (green, in the hypothalamus), noradrenergic (white, in the olfactory bulbs and yellow, in the pons), noradrenergic/adrenergic neurons (pink, in the brainstem). The cerebellum is in orange (AVI 96719 KB)
Supplementary material 2 Movie 2 3D movie of the localization of TH positive chromaffin cells in the adrenal medulla of adult mice (MP4 28586 KB)
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Godefroy, D., Rostène, W., Anouar, Y. et al. Tyrosine-hydroxylase immunoreactivity in the mouse transparent brain and adrenal glands. J Neural Transm 126, 367–375 (2019). https://doi.org/10.1007/s00702-018-1925-x
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DOI: https://doi.org/10.1007/s00702-018-1925-x