What are Peptides?

  • Definition: Short chains of 2‑50 amino acids, the building blocks of proteins.
  • Contrast with Proteins: Proteins contain ≥50 amino acids and fold into complex 3‑D structures, whereas peptides are simpler and often linear.

Biological Role of Endogenous Peptides

  • Act as hormones, neurotransmitters, and local regulators.
  • Regulate metabolism, immune response, tissue repair, appetite, and growth.

Peptide Therapy

  • Concept: Administration of synthetic or naturally derived peptides to replicate or augment the body’s signalling pathways.
  • Mechanism: Lock‑and‑key binding to specific cell‑surface receptors, eliciting targeted responses with potentially fewer off‑target effects than small‑molecule drugs.
  • Route of Administration: Primarily subcutaneous injections because peptides are degraded by gastrointestinal enzymes.

Major Clinical Applications

  • Diabetes & Obesity: GLP‑1 analogues (e.g., liraglutide, semaglutide) improve glycaemic control and reduce appetite.
  • Oncology: Peptide‑based targeting of tumour‑specific receptors; peptide‑drug conjugates deliver cytotoxics directly to cancer cells.
  • Infertility & Growth Disorders: Gonadotropin‑releasing hormone (GnRH) analogues, growth‑hormone‑releasing peptides.
  • Regenerative Medicine: Peptides promoting muscle, nerve and tendon repair.
  • Dermatology & Wound Healing, Osteoporosis, Cardiovascular diseases, Viral infections – emerging research areas.

Safety Concerns & Misuse

  • Bio‑hacking Trend: Unapproved “research chemicals” sold online are self‑administered without clinical validation.
  • Potential Hazards: Endocrine imbalance, metabolic disturbances, cardiovascular events, allergic reactions.
  • Regulatory Gap: Many peptide products fall in a gray zone between cosmetics, supplements and drugs, complicating oversight.

Regulatory & Policy Implications for India

  • Need for clear classification under the Drugs and Cosmetics Act, 1940 and the New Drugs and Clinical Trials Rules, 2019.
  • Strengthening pharmacovigilance and post‑marketing surveillance for peptide‑based medicines.
  • Public awareness campaigns to curb self‑medication and illegal imports.

Constitutional/Legal Provisions

  • Article 21 – Right to health; the state must ensure safety of therapeutic products.
  • Drugs and Cosmetics Act, 1940 – Governs approval, manufacture, and sale of drugs, including biologics.
  • National Pharmaceutical Pricing Authority (NPPA) – May regulate pricing of peptide therapeutics to ensure affordability.

Relevance for UPSC

  • Highlights the intersection of biotechnology, public health, and regulatory governance – core themes of GS Paper‑3 and GS Paper‑2.
  • Provides factual data for prelims and analytical angles (regulation, ethical concerns) for mains essays.

Key Take‑aways

  • Peptides = 2‑50 amino acids; act as natural signalling molecules.
  • Therapeutic peptides offer targeted action with fewer side effects.
  • GLP‑1 analogues are flagship peptide drugs for diabetes/obesity.
  • Unregulated self‑use poses serious health risks.
  • Robust regulatory framework is essential for safety and accessibility.