Abstract:
:Keratin 6 (K6) expression in the epidermis has two components: constitutive expression in the innermost layer of the outer root sheath (ORS) of hair follicles and inducible expression in the interfollicular epidermis in response to stressful stimuli such as wounding. Mice express two K6 isoforms, MK6a and MK6b. To gain insight into the functional significance of these isoforms, we generated MK6a-deficient mice through mouse embryonic stem cell technology. Upon wounding, MK6a was induced in the outer ORS and the interfollicular epidermis including the basal cell layer of MK6a(+/+) mice, whereas MK6b induction in MK6a(-/-) mice was restricted to the suprabasal layers of the epidermis. After superficial wounding of the epidermis by tape stripping, MK6a(-/-) mice showed a delay in reepithelialization from the hair follicle. However, the healing of full-thickness skin wounds was not impaired in MK6a(-/-) animals. Migration and proliferation of MK6a(-/-) keratinocytes were not impaired in vitro. Furthermore, the migrating and the proliferating keratinocytes of full-thickness wounds in MK6a(-/-) animals expressed neither MK6a nor MK6b. These data indicate that MK6a does not play a major role in keratinocyte proliferation or migration but point to a role in the activation of follicular keratinocytes after wounding. This study represents the first report of a keratin null mutation that results in a wound healing defect.
journal_name
Mol Cell Bioljournal_title
Molecular and cellular biologyauthors
Wojcik SM,Bundman DS,Roop DRdoi
10.1128/mcb.20.14.5248-5255.2000subject
Has Abstractpub_date
2000-07-01 00:00:00pages
5248-55issue
14eissn
0270-7306issn
1098-5549journal_volume
20pub_type
杂志文章abstract::Fusions between the TRM1 gene of Saccharomyces cerevisiae and COXIV or DHFR were made to examine the mitochondrial targeting signals of N2,N2-dimethylguanosine-specific tRNA methyltransferase [tRNA (m2(2)G)dimethyltransferase]. This enzyme is responsible for the modification of both mitochondrial and cytoplasmic tRNAs...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.9.4.1611
更新日期:1989-04-01 00:00:00
abstract::The adenovirus EIa gene products activate transcription from the viral EIII and EIIaE promoters. We studied the mechanism of this stimulation by constructing a series of chimeric promoter recombinants containing the upstream regions of the EIII and EIIaE promoters linked to the TATA box-start-site regions of the viral...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.6.1.201
更新日期:1986-01-01 00:00:00
abstract::NIH3T3 cells transformed by mouse Int-2/Fgf-3 cDNA express a series of Int-2-related products representing discrete stages of processing and glycosylation. We confirm that in at least two highly transformed clonal lines, Int-2 products acquire further modifications and are efficiently secreted into the culture medium....
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.11.12.5929
更新日期:1991-12-01 00:00:00
abstract::Although TRAIL is considered a potential anticancer agent, it enhances tumor progression by activating NF-κB in apoptosis-resistant cells. Cellular FLICE-like inhibitory protein (cFLIP) overexpression and caspase-8 activation have been implicated in TRAIL-induced NF-κB activation; however, the underlying mechanisms ar...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.00692-15
更新日期:2015-10-01 00:00:00
abstract::Stp1p and Stp2p are homologous and redundant transcription factors that are synthesized as latent cytoplasmic proteins with N-terminal regulatory domains. In response to extracellular amino acids, the plasma membrane-localized Ssy1p-Ptr3p-Ssy5p (SPS) sensor induces an endoproteolytic processing event that cleaves away...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.24.17.7503-7513.2004
更新日期:2004-09-01 00:00:00
abstract::We have previously reported that antibodies to phosphotyrosine recognize the phosphorylated forms of platelet-derived growth factor (PDGF) and epidermal growth factor (EGF) receptors (Zippel et al., Biochim. Biophys. Acta 881:54-61, 1986, and Sturani et al., Biochem. Biophys. Res. Commun. 137:343-350, 1986). In this r...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.8.3.1345
更新日期:1988-03-01 00:00:00
abstract::Sensing of extracellular glucose is necessary for cells to adapt to glucose variation in their environment. In the respiratory yeast Kluyveromyces lactis, extracellular glucose controls the expression of major glucose permease gene RAG1 through a cascade similar to the Saccharomyces cerevisiae Snf3/Rgt2/Rgt1 glucose s...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.00515-14
更新日期:2015-02-01 00:00:00
abstract::How early- and late-firing origins are selected on eukaryotic chromosomes is largely unknown. Here, we show that Mrc1, a conserved factor required for stabilization of stalled replication forks, selectively binds to the early-firing origins in a manner independent of Cdc45 and Hsk1 kinase in the fission yeast Schizosa...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.01239-10
更新日期:2011-06-01 00:00:00
abstract::In 7 of 37 patients with cutaneous melanoma, mutations in the N-ras gene were found. The primary tumors of these seven patients were exclusively localized on body sites continuously exposed to sunlight. Moreover, the ras mutations were all at or near dipyrimidine sites known to be targets of UV damage. Two primary tum...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.9.7.3114
更新日期:1989-07-01 00:00:00
abstract::The spliceosomal small nuclear RNAs U1, U2, U4, and U5 are transcribed by RNA polymerase II as precursors with extensions at their 3' ends. The 3' processing of these pre-snRNAs is not understood in detail. Two pathways of pre-U2 RNA 3' processing in vitro were revealed in the present investigation by using a series o...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.17.12.7178
更新日期:1997-12-01 00:00:00
abstract::Zinc finger genes encode proteins that act as transcription factors. The myeloid zinc finger 1 (MZF1) gene encodes a zinc finger protein with two DNA-binding domains that recognize two distinct consensus sequences, is preferentially expressed in hematopoietic cells, and may be involved in the transcriptional regulatio...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.15.11.6075
更新日期:1995-11-01 00:00:00
abstract::ATR kinase activation requires the recruitment of the ATR-ATRIP and RAD9-HUS1-RAD1 (9-1-1) checkpoint complexes to sites of DNA damage or replication stress. Replication protein A (RPA) bound to single-stranded DNA is at least part of the molecular recognition element that recruits these checkpoint complexes. We have ...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.01079-08
更新日期:2008-12-01 00:00:00
abstract::Estrogen receptors (ERs) are hormone-regulated transcription factors that regulate key aspects of reproduction and development. ERs are unusual in that they do not typically repress transcription in the absence of hormone but instead possess otherwise cryptic repressive functions that are revealed upon binding to cert...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.01002-09
更新日期:2010-03-01 00:00:00
abstract::The dorsal protein (DL) regulates the transcriptional activity of several genes that determine cell fate along the dorsoventral axis of the Drosophila melanogaster embryo. DL is present at high levels in ventral nuclei, where it activates some genes (twi and sna) and represses others (zen, dpp, and tld). DL shows homo...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.14.1.713
更新日期:1994-01-01 00:00:00
abstract::Saccharomyces cerevisiae contains several prion elements, which are epigenetically transmitted as self-perpetuating protein conformations. One such prion is [SWI + ], whose protein determinant is Swi1, a subunit of the SWI/SNF chromatin-remodeling complex. We previously rep...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.00206-17
更新日期:2017-09-26 00:00:00
abstract::The xCR1 protein is a maternal determinant and cofactor for nodal signaling in vertebrate embryos. The xCR1 protein accumulates specifically in the animal cells of Xenopus embryos, but maternal xCR1 mRNA is distributed equally throughout all embryonic cells. Here, we show that vegetal cell-specific translational repre...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.01865-08
更新日期:2009-07-01 00:00:00
abstract::Temperature-sensitive mutants defective in 60S ribosomal subunit protein L16 of Saccharomyces cerevisiae were isolated through hydroxylamine mutagenesis of the RPL16B gene and plasmid shuffling. Two heat-sensitive and two cold-sensitive isolates were characterized. The growth of the four mutants is inhibited at their ...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.11.11.5681
更新日期:1991-11-01 00:00:00
abstract::The hemagglutinin-neuraminidase (HN) protein of paramyxoviruses is likely in the unusual class of glycoproteins with the amino terminus cytoplasmic and the carboxy terminus lumenal or external to the cell. The properties of the membrane insertion of the HN protein of Newcastle disease virus, a prototype paramyxovirus,...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.7.4.1386
更新日期:1987-04-01 00:00:00
abstract::Multipotential stem cell lines, derived specifically from long-term bone marrow cultures infected with a recombinant retrovirus carrying v-src, lack v-src. Stable consequences thus result from transient actions or indirect effects of v-src on other cells, with the latter possibility being favored by its mosaic express...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.6.3.959
更新日期:1986-03-01 00:00:00
abstract::The chemotropic guidance cue netrin-1 mediates attraction of migrating axons during central nervous system development through the receptor Deleted in Colorectal Cancer (DCC). Downstream of netrin-1, activated Rho GTPases Rac1 and Cdc42 induce cytoskeletal rearrangements within the growth cone. The Rho guanine nucleot...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.01264-12
更新日期:2013-02-01 00:00:00
abstract::An electrophoretic mobility shift assay was used to characterize interactions of nuclear proteins with a DNA segment in the enhancer element of the leukemogenic murine retrovirus SL3-3. Mutation of a DNA sequence of the 5'-TGTGG-3' type decreased transcription in vivo specifically in T-lymphocyte cell lines. Extracts ...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.8.4.1625
更新日期:1988-04-01 00:00:00
abstract::Protein sumoylation plays an important but poorly understood role in controlling genome integrity. In Saccharomyces cerevisiae, the Slx5-Slx8 SUMO-targeted Ub ligase appears to be needed to ubiquitinate sumoylated proteins that arise in the absence of the Sgs1 DNA helicase. WSS1, a high-copy-number suppressor of a mut...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.01649-09
更新日期:2010-08-01 00:00:00
abstract::Little is known about the posttranslational control of the cyclin-dependent protein kinase (CDK) inhibitor p21. We describe here a transient phosphorylation of p21 in the G2/M phase. G2/M-phosphorylated p21 is short-lived relative to hypophosphorylated p21. p21 becomes nuclear during S phase, prior to its phosphorylat...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.25.8.3364-3387.2005
更新日期:2005-04-01 00:00:00
abstract::Nucleolar morphogenesis is a poorly defined process. Here we report that the Saccharomyces cerevisiae nucleolar trimethyl guanosine synthase I (Tgs1p), which specifically selects the m(7)G cap structure of snRNAs and snoRNAs for m(2,2,7)G conversion, is required not only for efficient pre-mRNA splicing but also for pr...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.24.18.7976-7986.2004
更新日期:2004-09-01 00:00:00
abstract::Human ras genes play central roles in coupling extracellular signals with complex intracellular networks controlling proliferation, differentiation, and apoptosis, among others processes. c-H-ras pre-mRNA can be alternatively processed into two mRNAs due to the inclusion or exclusion of the alternative exon IDX; this ...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.23.8.2927-2941.2003
更新日期:2003-04-01 00:00:00
abstract::Drosophila virilis genomic DNA corresponding to the D. melanogaster embryonic lethal abnormal visual system (elav) locus was cloned. DNA sequence analysis of a 3.8-kb genomic piece allowed identification of (i) an open reading frame (ORF) with striking homology to the previously identified D. melanogaster ORF and (ii)...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.11.6.2994
更新日期:1991-06-01 00:00:00
abstract::The transcriptional coactivator BOB.1/OBF.1 confers B-cell specificity on the transcription factors Oct1 and Oct2 at octamer site-containing promoters. A hallmark of the BOB.1/OBF.1 mutation in the mouse is the absence of germinal center development in secondary lymphoid organs, demonstrating the requirement for BOB.1...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.21.5.1531-1539.2001
更新日期:2001-03-01 00:00:00
abstract::To interrogate endogenous p21(WAF1/CIP1) (p21) promoter activity under basal conditions and in response to various forms of stress, knock-in imaging reporter mice in which expression of firefly luciferase (FLuc) was placed under the control of the endogenous p21 promoter within the Cdkn1a gene locus were generated. Bi...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/MCB.05243-11
更新日期:2011-09-01 00:00:00
abstract::The Caenorhabditis elegans run gene encodes a Runt domain factor. Runx1, Runx2, and Runx3 are the three known mammalian homologs of run. Runx1, which plays an essential role in hematopoiesis, has been identified at the breakpoint of chromosome translocations that are responsible for human leukemia. Runx2 plays an esse...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.22.2.547-554.2002
更新日期:2002-01-01 00:00:00
abstract::In the sea urchin embryo, late histone genes are transcribed at low levels during cleavage and blastula formation and at substantially higher levels in later stages of embryogenesis. To investigate the molecular basis of the stage-specific expression of a late H2B histone gene, we injected mutant genes lacking portion...
journal_title:Molecular and cellular biology
pub_type: 杂志文章
doi:10.1128/mcb.10.12.6730
更新日期:1990-12-01 00:00:00