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Expression of the monocytic differentiation/activation factor P48 in Mycoplasma species
R E Hall1, D P Kestler, S Agarwal
1Department of Medicine, Division of Hematology/Oncology, University ofTennessee Medical Center/Graduate School of Medicine, Knoxville, TN, USA.
Abstract:
P48 is a 48 kd monocytic differentiation/activation factor previously purified from the conditioned medium of the Reh human pre-B cell leukemia line. It induces differentiation of HL-60 promyelocytic leukemia cells along the monocytic pathway and production of IL1, TNF-alpha and IL6 in human monocytes and monocytic cell lines. Recently our laboratory isolated cDNA clones for P48 from Reh cells and genomic clones from Mycoplasma fermentans DNA and showed that P48 is a M. fermentans gene product. In this paper we report the analysis of P48 expression at the DNA, mRNA and protein levels in different Mycoplasma species. Polymerase Chain Reaction (PCR) analysis of extracted DNA using P48-specific oligonucleotide primers revealed P48 sequences in M. fermentans but not M. hominis, M. iowae, M. genitalium or M. capricolum. Southern analysis of Mycoplasma DNAs revealed hybridizing bands in M. fermentans and M. capricolum under low stringency, but only in M. fermentans under high stringency. Consistent with this, Northern blot studies revealed a single hybridizing transcript in M. fermentans but not in other Mycoplasma species tested. However, Western blot studies with anti-P48 antibodies revealed P48 antigenic material in M. fermentans, as well as M. hominis and M. iowae. These studies demonstrate that the gene for P48 is derived from M. fermentans or a closely related species and is absent in these other species tested. However, the P48 protein exhibits shared antigenic determinants among several Mycoplasma species which presently are of unknown function or significance. P48 is a Mycoplasma -derived immunomodulatory molecule which may be important in Mycoplasma pathophysiology and may be useful in understanding human haematopoietic differentiation and the control of cytokine biosynthesis.
Insights
The P48 gene originates from Mycoplasma fermentans, but the P48 protein is found across multiple Mycoplasma species. This immunomodulatory molecule impacts human cell differentiation and cytokine production.
Area of Science:
- Immunology
- Microbiology
- Molecular Biology
Background:
- P48 is a monocytic differentiation/activation factor inducing cytokine production.
- P48 was identified as a Mycoplasma fermentans gene product.
- The expression of P48 across Mycoplasma species requires investigation.
Purpose of the Study:
- To analyze P48 expression at DNA, mRNA, and protein levels in various Mycoplasma species.
- To determine the origin and distribution of the P48 gene and protein.
- To understand the immunomodulatory role of P48 in Mycoplasma pathophysiology.
Main Methods:
- Polymerase Chain Reaction (PCR) for DNA analysis.
- Southern and Northern blot analyses for gene and transcript detection.
- Western blot analysis for protein detection using anti-P48 antibodies.
Main Results:
- P48 DNA sequences were found in M. fermentans but not other tested species.
- High-stringency Southern and Northern blots confirmed P48 presence solely in M. fermentans.
- Western blots revealed P48 antigenic material in M. fermentans, M. hominis, and M. iowae.
Conclusions:
- The P48 gene is specific to M. fermentans or closely related species.
- The P48 protein shares antigenic determinants across several Mycoplasma species.
- P48 is a Mycoplasma-derived immunomodulator potentially significant in disease and human hematopoietic differentiation.