Epigenetic silencing of the tumor suppressor gene p15Ink4b (CDKN2B) is a frequent event in blood disorders like acute myeloid leukemia and myelodysplastic syndromes. The molecular function of p15Ink4b in hematopoietic differentiation still remains to be elucidated. Our previous study demonstrated that loss of p15Ink4b in mice results in skewing of the differentiation pattern of the common myelo...

p15INK4B, a cyclin-dependent kinase inhibitor, has been recognized as a tumor suppressor. Loss of or methylation of the p15INK4B gene in chronic myeloid leukemia (CML) cells enhances myeloid progenitor formation from common myeloid progenitors. Therefore, we examined the effects of overexpressed p15INK4B on proliferation and apoptosis of CML cells. Overexpression of p15INK4B inhibited the growt...

BACKGROUND The basal cell carcinoma (BCC) is the most common non-melanoma skin cancer (NMSK). BCC might develop because of the faulty cell cycle arrest. P15INK4b is a tumor suppressor gene, involved in cell cycle arrest and inactivated in most human cancers. The role of p15INK4b protein expression in the genesis of BCC is as yet unknown. In a previous study we showed the absence of p15INK4b exp...

The tumor suppressor p15Ink4b is frequently inactivated by methylation in acute myeloid leukemia and premalignant myeloid disorders. Dendritic cells (DCs) as potent APCs play critical regulatory roles in antileukemic immune responses. In the present study, we investigated whether p15Ink4b can function as modulator of DC development. The expression of p15Ink4b is induced strongly during differen...

Silencing of the cyclin-dependent kinase inhibitor gene p15INK4B by cytosine methylation of the promoter region has been associated with some types of hematological malignancy. To study in detail the patterns of p15INK4B methylation in patients with acute myeloid leukemia, we adopted a novel approach based on PCR amplification of bisulfite-treated DNA followed by resolution of differentially me...

Recently the putative tumor suppressor gene p16INK4 was mapped to human chromosome 9p21, which is homologous to rat chromosome 5. Monosomy of rat chromosome 5 occurs with high frequency in rat kidney tumor-derived cell lines (ERC lines). Thus, we studied these lines in order to investigate the involvement of p15INK4B and p16INK4 in the genesis of this tumor type. p15INK4B and p16INK4 were found...

p16Ink4 and p15Ink4B are cyclin-dependent kinase 4 inhibitors and link to the regulation of cell cycle in mammalian cells. The genes encoding these inhibitors are located at 9p21, which is a frequent site of allelic loss in various types of tumors. Twenty-five primary biliary tract cancers were examined for somatic mutations in p16Ink4/CDKN2, p15Ink4B/MTS2, p53, and K-ras genes and allelic loss...

Malignant cells from 52 children with acute lymphocytic leukemia (ALL) were investigated for inactivation of the p15ink4B and p16ink4 genes and other genetic alterations on chromosome 9p21. Homozygous deletions of the p15ink4B and/or the p16ink4 genes were detected in 16 cases and a further 9 cases showed evidence of allelic loss either by hemizygous deletion or loss of heterozygosity (LOH) for...

p16INK4a and p15INK4b genes, which encode two functionally related CDK inhibitors, recently emerged as candidate tumor suppressor genes since they were both localized to 9p21, which frequently undergoes hemizygous and homozygous deletion in a variety of tumor types. To determine the mode of inactivation of these two genes in human esophageal squamous cell carcinoma (ESCC), we performed multiple...