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Cyclopamine Inhibition of Sonic Hedgehog Signal Transduction Is Developmental Biology 224, 440–452 (2000) doi:10.1006/dbio.2000.9775, available online at http://www.idealibrary.com on View metadata, citation and similar papers at core.ac.uk brought to you by CORE Cyclopamine Inhibition of Sonic Hedgehog Signalprovided by Elsevier - Publisher Connector Transduction Is Not Mediated through Effects on Cholesterol Transport John P. Incardona,* William Gaffield,† Yvonne Lange,‡ Adele Cooney,§ Peter G. Pentchev,§ Sharon Liu,¶ John A. Watson,¶ Raj P. Kapur,ሻ and Henk Roelink*,1 *Department of Biological Structure and Center for Developmental Biology and ࿣Department of Pathology, University of Washington, Seattle, Washington 98195; †Western Regional Research Center, ARS, United States Department of Agriculture, Albany, California 94710; ‡Department of Pathology, Rush–Presbyterian–St. Luke’s Medical Center, Chicago, Illinois 60612; §Developmental and Metabolic Neurobiology Branch, NINDS, National Institutes of Health, Bethesda, Maryland 20892; and ¶Department of Biochemistry and Biophysics, University of California at San Francisco, San Francisco, California 94143 Cyclopamine is a teratogenic steroidal alkaloid that causes cyclopia by blocking Sonic hedgehog (Shh) signal transduction. We have tested whether this activity of cyclopamine is related to disruption of cellular cholesterol transport and putative secondary effects on the Shh receptor, Patched (Ptc). First, we report that the potent antagonism of Shh signaling by cyclopamine is not a general property of steroidal alkaloids with similar structure. The structural features of steroidal alkaloids previously associated with the induction of holoprosencephaly in whole animals are also associated with inhibition of Shh signaling in vitro. Second, by comparing the effects of cyclopamine on Shh signaling with those of compounds known to block cholesterol transport, we show that the action of cyclopamine cannot be explained by inhibition of intracellular cholesterol transport. However, compounds that block cholesterol transport by affecting the vesicular trafficking of the Niemann–Pick C1 protein (NPC1), which is structurally similar to Ptc, are weak Shh antagonists. Rather than supporting a direct link between cholesterol homeostasis and Shh signaling, our findings suggest that the functions of both NPC1 and Ptc involve a common vesicular transport pathway. Consistent with this model, we find that Ptc and NPC1 colocalize extensively in a vesicular compartment in cotransfected cells. © 2000 Academic Press Key Words: neural development; holoprosencephaly; teratogen; U18666A; progesterone; membrane trafficking. INTRODUCTION required for the induction of ventral cell types in the forebrain (Tanabe and Jessell, 1996; Dale et al., 1997). Loss Hedgehog family members are extracellular signaling of normal Shh function leads to a loss of ventral cell types molecules involved in embryonic patterning in many ani- all along the neural tube. This has significant conse- mal phyla. In vertebrates, Sonic hedgehog (Shh) plays a quences, especially in the forebrain, which fails to divide critical role in patterning of the neural tube. Notochord- into hemispheres (Chiang et al., 1996; Roessler et al., 1996). derived Shh mediates both the induction of ventral cell An undivided forebrain, or holoprosencephaly, in its most types in the neural tube and the ventral exclusion of dorsal extreme form is associated with cyclopia (for review, see cell types, and Shh released from the prechordal plate is Siebert et al., 1990; Roessler and Muenke, 1998). Cyclopamine is one of a small group of steroidal alka- 1 To whom correspondence should be addressed at the Depart- loids, produced by Veratrum lily species, that induce holo- ment of Biological Structure, University of Washington at Seattle, prosencephaly and cyclopia in mammalian and avian em- Box 357420, HSB G527, Seattle, WA 98195. Fax: (206) 543-1524. bryos. Cyclopamine causes holoprosencephaly by blocking E-mail: [email protected]. the response to Shh of cells normally sensitive to Shh. The 0012-1606/00 $35.00 Copyright © 2000 by Academic Press 440 All rights of reproduction in any form reserved. Cyclopamine, Cholesterol Transport, and Shh Signaling 441 loss of Shh responsiveness within the developing neural tube, due to early embryonic exposure to cyclopamine, results in a phenocopy of the Shh null mutant (Cooper et al., 1998; Incardona et al., 1998). Our previous studies demonstrated that a suite of Shh-dependent cell types in the neural tube was affected in embryos with cyclopamine- induced holoprosencephaly. Furthermore, cyclopamine in- hibits multiple Shh-mediated signaling events in other tissues at very different times of development, including somites (Incardona et al., 1998), heart (J.P.I., unpublished observation), gut (Kim and Melton, 1998), limb/fin (Neu- mann et al., 1999), and skin (Chiang et al., 1999). Two decades of work by Keeler and colleagues demon- strated that unique structural features of cyclopamine and the related teratogenic compound jervine (Fig. 1) are re- quired for the induction of holoprosencephaly in whole animal studies (reviewed in Gaffield and Keeler, 1996a,b). Subtle changes in the structures of cyclopamine and jervine dramatically affect their teratogenic potency, suggesting that a precise interaction with a target is required for their inhibitory action. Since cyclopamine blocks the response to Shh, the cyclopamine target is likely to be involved in Shh signal transduction. Given the extreme hydrophobicity of cyclopamine and related compounds, we expect that their target is a membrane-associated protein, possibly an ele- ment of the Shh receptor complex. Elements of the Shh receptor are the multiple membrane spanning proteins Patched (Ptc) and Smoothened (Smo), which act in concert to mediate the Shh signal (Marigo et al., 1996; Stone et al., 1996; Chen and Struhl, 1998; for review, see Ingham, 1998; Murone et al., 1999). Shh binds to Ptc, which in turn releases the inhibition of Smo by Ptc, thus activating the FIG. 1. The structures of steroidal alkaloids and steroids tested for Shh response. inhibition of Shh signaling. The structure of cholesterol is shown at The structural similarity between cyclopamine and cho- top left and the generic jervane-type steroidal alkaloid structure is lesterol suggests a tantalizing potential mode of action of at top right. Natural jervane alkaloids and synthetic derivatives are cyclopamine, especially in light of the association of holo- listed below the generic structure, with differences indicated for prosencephaly, and thus attenuation of Shh signaling, with the functional groups RЈ and RЉ, and for the type of C–C bond at genetic or pharmacologic impairment of enzymes involved three variant positions. Cycloposine has a single glucose (glc) in the terminal steps of cholesterol biosynthesis. These residue in a glycosidic linkage to the 3-OH. Veratramine (middle, latter conditions produce both reduced levels of tissue left) occurs naturally and also is derived from cyclopamine by cholesterol and high levels of sterol precursors (Tint et al., electrophilic attack on the furan (E) ring under acidic conditions. The spirosolane-type steroidal alkaloids solasodine and tomatidine 1994; Kolf-Clauw et al., 1996). In particular, mutations in ⌬ are represented by a generic structure (middle, right). These two the gene encoding 7-dehydrocholesterol (7-DHC) reduc- alkaloids differ only in the position of the N in the F ring (RЈ and RЉ) tase (Fitzky et al., 1998) or inhibition of 7-DHC reductase and in the level of saturation at C-5, C-6. Note the differences in by the inhibitor AY-9944 promote mild forms of holo- the E–F ring attachment to ring D between jervanes and spi- prosencephaly (Roux and Aubry, 1966; Kelley et al., 1996). rosolanes, which results in an orientation of the spirofuranopiperi- The simple hypothesis that both cyclopamine and AY-9944 dine moiety of cyclopamine perpendicular to the planar steroidal inhibit the response of cells in the developing neural tube to framework. The glycoalkaloid saponins tomatine and solasonine Shh through the inhibition of cholesterol synthesis was possess 4- and 3-residue oligosaccharides attached to the 3-OH refuted, however, since AY-9944 is effective only when group of tomatidine and solasodine, respectively. The steroidal ␤ responding cells are deprived of exogenous cholesterol and amine U18666A [3 -(2-diethylaminoethoxy)androstenone] is repre- sented at bottom left and progesterone at bottom right. therefore have to rely on endogenously synthesized choles- terol, while the action of cyclopamine is independent of the activity of the cholesterol synthetic pathway (Incardona et al., 1998). Accumulation of putatively teratogenic choles- holoprosencephaly-inducing activity of cyclopamine is in- terol precursors, rather than cholesterol depletion, may dependent of cholesterol supply and is most likely mediated underlie Shh-response inhibition by AY-9944. The by another mechanism. Copyright © 2000 by Academic Press. All rights of reproduction in any form reserved. 442 Incardona et al. In addition to cyclopamine and AY-9944, other com- dently on targets within the Shh signaling pathway and the pounds disturbing cholesterol homeostasis reportedly in- NPC1-mediated cholesterol transport pathway with vary- hibit the response to Shh (Cooper et al., 1998). These ing efficiency. Our data suggest that the remarkable sensi- compounds include other hydrophobic amines and steroids tivity of Shh signal transduction to cyclopamine
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