Related Experiment Video
Updated: May 1, 2026
Assessing Cellular Target Engagement by SHP2 PTPN11 Phosphatase Inhibitors
Published on: July 17, 2020
Cellular prostatic acid phosphatase, a PTEN-functional homologue in prostate epithelia, functions as a
Sakthivel Muniyan1, Matthew A Ingersoll1, Surinder K Batra2
1Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA.
Abstract:
The inactivation of tumor suppressor genes (TSGs) plays a vital role in the progression of human cancers. Nevertheless, those ubiquitous TSGs have been shown with limited roles in various stages of diverse carcinogenesis. Investigation on identifying unique TSG, especially for early stage of carcinogenesis, is imperative. As such, the search for organ-specific TSGs has emerged as a major strategy in cancer research. Prostate cancer (PCa) has the highest incidence in solid tumors in US males. Cellular prostatic acid phosphatase (cPAcP) is a prostate-specific differentiation antigen. Despite intensive studies over the past several decades on PAcP as a PCa biomarker, the role of cPAcP as a PCa-specific tumor suppressor has only recently been emerged and validated. The mechanism underlying the pivotal role of cPAcP as a prostate-specific TSG is, in part, due to its function as a protein tyrosine phosphatase (PTP) as well as a phosphoinositide phosphatase (PIP), an apparent functional homologue to phosphatase and tensin homolog (PTEN) in PCa cells. This review is focused on discussing the function of this authentic prostate-specific tumor suppressor and the mechanism behind the loss of cPAcP expression leading to prostate carcinogenesis. We review other phosphatases' roles as TSGs which regulate oncogenic PI3K signaling in PCa and discuss the functional similarity between cPAcP and PTEN in prostate carcinogenesis.
Insights
Cellular prostatic acid phosphatase (cPAcP) acts as a tumor suppressor in prostate cancer. Its loss of function contributes to cancer development, similar to PTEN.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Tumor suppressor genes (TSGs) are crucial in cancer progression, but many have limited roles in early carcinogenesis.
- Identifying organ-specific TSGs is a key strategy in cancer research, particularly for early-stage detection and intervention.
- Prostate cancer (PCa) is a leading cancer in US males, necessitating research into its unique molecular mechanisms.
Purpose of the Study:
- To review the function of cellular prostatic acid phosphatase (cPAcP) as a prostate-specific tumor suppressor.
- To elucidate the mechanisms by which loss of cPAcP expression contributes to prostate carcinogenesis.
- To discuss the functional similarities between cPAcP and PTEN in the context of PCa.
Main Methods:
- Literature review of studies on cPAcP, PTEN, and their roles in prostate cancer.
- Analysis of cPAcP's phosphatase activities (protein tyrosine phosphatase and phosphoinositide phosphatase).
- Comparison of cPAcP and PTEN signaling pathways in prostate carcinogenesis.
Main Results:
- cPAcP functions as a prostate-specific tumor suppressor, analogous to PTEN.
- cPAcP's phosphatase activities are critical for its tumor-suppressive role in PCa cells.
- Loss of cPAcP expression is linked to the initiation and progression of prostate cancer.
Conclusions:
- cPAcP is an authentic prostate-specific tumor suppressor whose functions are vital for preventing prostate carcinogenesis.
- Understanding cPAcP's role and its regulation provides insights into novel therapeutic strategies for PCa.
- The functional homology between cPAcP and PTEN highlights conserved pathways in prostate cancer development.
Related Concept Videos
02:23Abnormal Proliferation
01:12Loss of Tumor Suppressor Gene Functions
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
01:12Loss of Tumor Suppressor Gene Functions
01:23Negative Regulator Molecules
02:54Protein Kinases and Phosphatases
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
01:19Allosteric Proteins-ATCase
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...