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Pachydermoperiostosis: analysis of the connective tissue abnormality in one family
A Oikarinen1, R Palatsi, M Kylmäniemi
1Department of Dermatology, University of Oulu, Finland.
Insights
Pachydermoperiostosis (PDP) involves connective tissue abnormalities, with acidic mucopolysaccharides accumulating in the skin. Increased osteocalcin suggests higher bone formation activity in affected individuals.
Area of Science:
- Connective tissue disorders
- Dermatology
- Genetics
Background:
- Pachydermoperiostosis (PDP) is a rare genetic disorder causing bone thickening, skin changes, and organ abnormalities.
- Previous research indicates connective tissue anomalies in PDP patients.
Observation:
- This study focused on a single family with PDP to detail their connective tissue abnormalities.
- Evaluations included clinical assessments, imaging, and specialized microscopic and biochemical analyses.
Findings:
- Immunohistochemical and electron microscopy revealed tenascin, glycosaminoglycans, and disorganized fibrillar material in elastic fibers.
- Serum osteocalcin levels were elevated, indicating increased osteoblastic activity.
- Collagen metabolism markers and lysosomal enzymes showed no significant alterations.
Implications:
- The findings highlight specific extracellular matrix accumulations in PDP dermis.
- Elevated osteocalcin supports increased bone remodeling in the condition.
- Further research into the mechanisms of connective tissue disorganization in PDP is warranted.
Background:
Pachydermoperiostosis (PDP) is a rare hereditary disease characterized by hyperostosis, clubbing of fingers, coarse skin, and abnormalities in other organs, such as the gastrointestinal tract. Previous studies have disclosed several abnormalities in the connective tissue in these patients.
Objective:
The purpose of the study was to investigate connective tissue abnormalities in one family with PDP.
Methods:
Clinical features were evaluated; x-ray, immunohistochemical, and electronmicroscopic studies were performed; and markers of collagen metabolism and lysosomal enzymes were determined.
Results:
Immunohistochemical and ultrastructural studies revealed accumulation of tenascin, glycosaminoglycans, and fibrillar material in apparently disorganized microfibrils of elastic fibers. Osteocalcin levels in the serum were increased, but synthesis and degradation markers of collagen in the serum were not altered. No evidence of a lysosomal enzyme deficiency was found.
Conclusion:
Acidic mucopolysaccharides and some fibrillar material accumulate in the dermis of patients with PDP. Increased levels of osteocalcin in serum indicate higher osteoblastic activity. Markers of synthesis and degradation of collagen were not altered.