RESEARCH: CANCER
FOLDING PROJECT #15227 PROFILE

This project looks at how PTCH1 moves cholesterol around in cells. This protein is important for stopping cancer-causing signals. If PTCH1 can't move cholesterol right, it leads to cancers like medulloblastoma and basal cell carcinoma. Learning how PTCH1 works could lead to new cancer treatments.

This project aims to elucidate the cholesterol transport mechanism in PTCH1, a transmembrane protein responsible for inhibiting SMO in the absence of SHH in the hedgehog signaling pathway by reducing access to ciliary membrane cholesterol.

Dysregulation of this pathway (such as the inability of PTCH1 to transport cholesterol and thereby inhibit SMO) has been linked to various cancers, including medulloblastoma and basal cell carcinoma.

Thus, understanding the mechanisms behind PTCH1 cholesterol transport will allow for therapeutic treatments to target these cancers.

PTCH1

Patched 1 protein, a transmembrane receptor involved in the hedgehog signaling pathway.

PTCH1 is a crucial protein that acts as a receptor within cells. It plays a vital role in regulating the hedgehog signaling pathway, which is essential for embryonic development and tissue maintenance. PTCH1 normally inhibits SMO, another protein in this pathway, when hedgehog signaling molecules are absent. This inhibition prevents excessive cell growth. Dysfunctions in PTCH1 can disrupt this balance, leading to uncontrolled cell proliferation and contributing to various cancers.

SMO

Smoothened

SMO is a key protein within the hedgehog signaling pathway. It acts as an activator of this pathway, promoting cell growth and proliferation when stimulated by hedgehog molecules. PTCH1 normally inhibits SMO activity in the absence of hedgehog signals, maintaining a balance in cellular growth. Aberrant activation of SMO due to PTCH1 dysfunction can contribute to cancer development.

SHH

Sonic Hedgehog

SHH is a signaling protein that initiates the hedgehog pathway. When bound to its receptor PTCH1, it activates downstream signaling events leading to cell growth and differentiation. Disruption of SHH signaling can lead to developmental abnormalities and certain types of cancer.

cholesterol

A waxy, fat-like substance found in all cells.

Cholesterol is a vital component of cell membranes, providing structural integrity and fluidity. It's also involved in hormone production and vitamin D synthesis. Dysregulation of cholesterol metabolism can contribute to various health issues, including cardiovascular disease.

transmembrane protein

A protein that spans the cell membrane.

Transmembrane proteins are crucial for cellular communication and transport. They embed themselves within the cell membrane, with portions extending both inside and outside the cell. This allows them to facilitate the movement of molecules across the membrane and mediate interactions between cells.

ciliary membrane

The membrane surrounding the cilia of a cell.

Cilia are hair-like structures on the surface of some cells that play important roles in sensing and responding to environmental stimuli. The ciliary membrane is the outer boundary of these structures and is involved in regulating the flow of molecules and signals within the cilium.