Search PubMed⌕ Search

PubMed · 8807822

Sonic hedgehog: making the gradient.

Abstract

The amino-terminal peptide of Sonic hedgehog is a cell-tethered molecule, which nevertheless seems to provide a developmental signal that acts at a distance and has different effects depending on its concentration. Recent structural data suggest that zinc-dependent proteolysis may somehow be involved in Sonic hedgehog's function.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

D A Bumcrot, A P McMahon. 1996. Sonic hedgehog: making the gradient.. https://doi.org/10.1016/s1074-5521(96)90077-0

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

Defective EV-mediated transport of SHH alters neural fate specification in EPM1 epilepsy.

The extracellular milieu, including extracellular vesicles (EVs), plays a pivotal role in brain development. In this study, we sought to elucidate the pathogenesis of progressive myoclonus epilepsy type 1 (EPM1), a disease caused by mutations in the CSTB gene, using cerebral organoids (COs) derived from patient cells. The results demonstrate that EPM1 COs display increased electrophysiological activity and disrupted excitatory/inhibitory (E/I) balance. Single-cell RNA sequencing analysis of ventral EPM1-COs revealed an abnormal specification of progenitor fate, with a shift toward dorsal neuron identities. We demonstrated that this misspecification is driven by a functional alteration of the ventral signaling niche, resulting from impaired EV dynamics and altered protein cargo. Mechanistically, we identified Sonic Hedgehog (SHH) as a direct physical interactor of CSTB and demonstrated that CSTB deficiency leads to reduced SHH content and secretion. Our findings establish CSTB as a safeguard of ventral patterning and identify the CSTB-SHH-EV axis as a potential therapeutic target for mitigating the E/I imbalance associated with EPM1.

Hedgehog Proteins↗

Cyclopamine: inhibiting hedgehog in the treatment of psoriasis.

The steroidal alkaloid cyclopamine, a direct inhibitor of the hedgehog (Hh) intracellular signaling pathway, has demonstrated promising initial results in the treatment of psoriasis. Cyclopamine initially was shown to be effective in the induction of the differentiation and apoptosis of basal cell carcinomas (BCCs). This brief review explains both the details of Hh signaling and the role of cyclopamine in interrupting it. Most importantly, this article discusses the implications of recent findings on the treatment of psoriasis. Although considerable research and clinical trials lie ahead, cyclopamine-induced Hh inhibition may represent the latest mechanistic pathway to combat psoriasis.

Hedgehog Proteins↗

Epithelial expression of SHH signaling pathway in odontogenic tumors.

Sonic hedgehog (SHH) signaling pathway plays a critical role in tooth development. Recent studies indicate that SHH signaling pathway activation occurs both in the odontogenic cyst and ameloblastoma. However, the association of SHH pathway with other subtypes of odontogenic tumor is not well documented. The objective of this paper is to investigate the protein distribution of SHH and its receptor PTC, SMO and transcription factor GLI1 in various odontogenic tumors. Odontogenic tumor tissues including 34 epithelial derived, 24 epithelial-mesenchymal derived, and 26 mesenchymal derived were examined by immunohistochemistry for SHH, PTC, SMO and GLI1. Immunoreactivity for SHH, PTC, SMO and GLI1 was detected in both epithelial derived odontogenic tumors and epithelial-mesenchymal derived odontogenic tumors with or without dental hard tissue formation. Mesenchymal derived odontogenic tumors showed no positive staining except for the focal epithelial cells in island or cord forms within the central portion of the tumor. The protein expression of SHH signaling pathway in malignant odontogenic tumors was no stronger than that in benign tumors. Each of the genes in the pathway was expressed in similar patterns in the same tumor subtype. SHH, PTC, SMO and GLI1 were detected more in the cytoplasm of the epithelial cells than in stromal cells. Immunoreactivity for GLI1 was also detected in the base membrane of the tumor cells. The findings suggest SHH, PTC, SMO and GLI1 protein are predominantly located in epithelial components in various odontogenic tumors and might participate in the proliferation of epithelial components of odontogenic tumors.

Hedgehog Proteins↗